Monday, September 3, 2007

COMPUTER NETWORKING


Computer network
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For the scientific and engineering discipline studying computer networks, see Computer networking.
“Computer Networks” redirects here. For the book Computer Networks, see Andrew S. Tanenbaum.
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A computer network is composed of multiple connected computers that communicate over a wired or wireless medium to share data and other resources. For instance, a home computer network may consist of two or more computers that share files and a printer using the network. The size and scalability of any computer network are determined both by the physical medium of communication and by the software controlling the communication (i.e., the protocols).

Ethernet RJ-45 (8P8C) patch cord of the type commonly used to connect network devices.
Contents[hide]
1 Definition
2 Classification of computer networks
2.1 By network layer
2.2 By scale
2.3 By connection method
2.4 By functional relationship
2.5 By network topology
2.6 By protocol
3 Types of networks:
3.1 Personal Area Network (PAN)
3.2 Local Area Network (LAN)
3.3 Campus Area Network (CAN)
3.4 Metropolitan Area Network (MAN)
3.5 Wide Area Network (WAN)
3.6 Global Area Network (GAN)
3.7 Internetwork
3.7.1 Intranet
3.7.2 Extranet
3.7.3 Internet, The
4 Basic Hardware Components
4.1 Network Interface Cards
4.2 Repeaters
4.3 Hubs
4.4 Bridges
4.5 Switches
4.6 Routers
5 Building a simple computer network
6 See also
7 References
//

[edit] Definition
Experts in the field of networking debate whether two computers that are connected together using some form of communications medium constitute a network. Therefore, some works state that a network requires three connected computers. One such source, "Telecommunications: Glossary of Telecommunication Terms" states that a computer network is "A network of data processing nodes that are interconnected for the purpose of data communication". The term "network" being defined in the same document as "An interconnection of three or more communicating entities".[1] A computer connected to a non-computing device (e.g., networked to a printer via an Ethernet link) may also represent a computer network, although this article does not address this configuration.
This article uses the definition which requires two or more computers to be connected together to form a network. [2] The same basic functions are generally present in this case as with larger numbers of connected computers. In order for a network to function, it must meet three basic requirements, it must provide connections, communications and services. Connections refers to the hardware, communications is the way in which the devices talk to each other, and services are the things which are shared with the rest of the network.[3]

[edit] Classification of computer networks

[edit] By network layer
Computer networks may be classified according to the network layer at which they operate according to some basic reference models that are considered to be standards in the industry such as the seven layer OSI reference model and the four layer Internet Protocol Suite model.

[edit] By scale
Computer networks may be classified according to the scale or extent of reach of the network, for example as a Personal area network (PAN), Local area network (LAN), Campus area network (CAN), Metropolitan area network (MAN), or Wide area network (WAN).

[edit] By connection method
Computer networks may be classified according to the hardware technology that is used to connect the individual devices in the network such as Ethernet, Wireless LAN, HomePNA, or Power line communication.

[edit] By functional relationship
Computer networks may be classified according to the functional relationships which exist between the elements of the network, for example Active Networking, Client-server and Peer-to-peer (workgroup) architectures.

[edit] By network topology
Main article: Network Topology
Computer networks may be classified according to the network topology upon which the network is based, such as Bus network, Star network, Ring network, Mesh network, Star-bus network, Tree or Hierarchical topology network, etc.
Network Topology signifies the way in which intelligent devices in the network see their logical relations to one another. The use of the term "logical" here is significant. That is, network topology is independent of the "physical" layout of the network. Even if networked computers are physically placed in a linear arrangement, if they are connected via a hub, the network has a Star topology, rather than a Bus Topology. In this regard the visual and operational characteristics of a network are distinct.

[edit] By protocol
Computer networks may be classified according to the communications protocol that is being used on the network. See the articles on List of network protocol stacks and List of network protocols for more information.

[edit] Types of networks:
Below is a list of the most common types of computer networks in order of scale.

[edit] Personal Area Network (PAN)
Main article: Personal area network
A personal area network (PAN) is a computer network used for communication among computer devices (including telephones and personal digital assistants) close to one person. The devices may or may not belong to the person in question. The reach of a PAN is typically a few meters. PANs can be used for communication among the personal devices themselves (intrapersonal communication), or for connecting to a higher level network and the Internet (an uplink).
Personal area networks may be wired with computer buses such as USB and FireWire. A wireless personal area network (WPAN) can also be made possible with network technologies such as IrDA and Bluetooth.

[edit] Local Area Network (LAN)
Main article: Local Area Network
A network covering a small geographic area, like a home, office, or building. Current LANs are most likely to be based on Ethernet technology. The defining characteristics of LANs, in contrast to WANs (wide area networks), include their much higher data transfer rates, smaller geographic range, and lack of a need for leased telecommunication lines. Hosts can be made part of a specific LAN can be defined by setting their address to one within the address range of the LAN subnet This can be done by manual configuration, or by configuring DHCP autoconfiguration to give the host an address in the appropriate range.
Currently standardized LAN technologies operate at speeds up to 10 Gigabits/sec. IEEE has projects investigating the standardization of 100 Gigabits/second, and possibly 40 Gigabits/second. Inverse multiplexing is commonly used to build a faster aggregate from slower physical streams, such as bringing 4 Gigabits/second aggregate stream into a computer or network element with four 1 Gigabit/second interfaces.

[edit] Campus Area Network (CAN)
Main article: Campus Area Network
A network that connects two or more LANs but that is limited to a specific (possibly private) geographical area such as a college campus, industrial complex, or a military base. A CAN, may be considered a type of MAN (metropolitan area network), but is generally limited to an area that is smaller than a typical MAN.

[edit] Metropolitan Area Network (MAN)
Main article: Metropolitan Area Network
A network that connects two or more Local Area Networks or CAN together but does not extend beyond the boundaries of the immediate town, city, or metropolitan area. Multiple routers, switches & hubs are connected to create a MAN

[edit] Wide Area Network (WAN)
Main article: Wide Area Network
A WAN is a data communications network that covers a relatively broad geographic area (i.e. one country to another and one continent to another continent) and that often uses transmission facilities provided by common carriers, such as telephone companies. WAN technologies generally function at the lower three layers of the OSI reference model: the physical layer, the data link layer, and the network layer.
The highest data rate commercially available, as a single bitstream, on WANs is 40 Gigabits/second, principally used between large service providers. Wavelength Division Multiplexing, however, can put multiple 10 or 40 Gpbs streams onto the same optical fiber.

[edit] Global Area Network (GAN)
Main article: Global Area Network
Global area networks (GAN) specifications are in development by several groups, and there is no common definition. In general, however, a GAN is a model for supporting mobile communications across an arbitrary number of wireless LANs, satellite coverage areas, etc. The key challenge in mobile communications is "handing off" the user communications from one local coverage area to the next. In IEEE Project 802, this involves a succession of terrestrial Wireless local area networks (WLAN) is the [4]. INMARSAT has defined a satellite-based Broadband Global Area Network (BGAN).
IEEE mobility efforts focus on the data link layer and make assumptions about the media. Mobile IP is a network layer technique, developed by the IETF, which is independent of the media type and can run over different media while still keeping the connection.

[edit] Internetwork
Main article: Internetwork
Two or more networks or network segments connected using devices that operate at layer 3 (the 'network' layer) of the OSI Basic Reference Model, such as a router. Any interconnection among or between public, private, commercial, industrial, or governmental networks may also be defined as an internetwork.
In modern practice, the interconnected networks use the Internet Protocol. There are at least three variants of internetwork, depending on who administers and who participates in them:
Intranet
Extranet
"The" Internet
Intranets and extranets may or may not have connections to the Internet. If connected to the Internet, the intranet or extranet is normally protected from being accessed from the Internet without proper authorization. The Internet itself is not considered to be a part of the intranet or extranet, although the Internet may serve as a portal for access to portions of an extranet.

[edit] Intranet
Main article: Intranet
An intranet is a set of interconnected networks, using the Internet Protocol and uses IP-based tools such as web browsers, that is under the control of a single administrative entity. That administrative entity closes the intranet to the rest of the world, and allows only specific users. Most commonly, an intranet is the internal network of a company or other enterprise.

[edit] Extranet
Main article: Extranet
A extranet is network or internetwork that is limited in scope to a single organization or entity but which also has limited connections to the networks of one or more other usually, but not necessarily, trusted organizations or entities (e.g., a company's customers may be provided access to some part of its intranet thusly creating an extranet while at the same time the customers may not be considered 'trusted' from a security standpoint). Technically, an extranet may also be categorized as a CAN, MAN, WAN, or other type of network, although, by definition, an extranet cannot consist of a single LAN, because an extranet must have at least one connection with an outside network.

[edit] Internet, The
Main article: Internet
A specific internetwork, consisting of a worldwide interconnection of governmental, academic, public, and private networks based upon the Advanced Research Projects Agency Network (ARPANET) developed by ARPA of the U.S. Department of Defense – also home to the World Wide Web (WWW) and referred to as the 'Internet' with a capital 'I' to distinguish it from other generic internetworks.
Participants in the Internet, or their service providers, use IP Adddresses obtained from address registries that control assignments. Service providers and large enterprises also exchange information on the reachability of their address ranges through the Border Gateway Protocol.

[edit] Basic Hardware Components
All networks are made up of basic hardware building blocks to interconnect network nodes, such as Network Interface Cards (NICs), Bridges, Hubs, Switches, and Routers. In addition, some method of connecting these building blocks is required, usually in the form of galvanic cable (most commonly Category 5 cable). Less common are microwave links (as in IEEE 802.11) or optical cable ("optical fiber").

[edit] Network Interface Cards
Main article: Network card
A network card, network adapter or NIC (network interface card) is a piece of computer hardware designed to allow computers to communicate over a computer network. It provides physical access to a networking medium and provides a low-level addressing system through the use of MAC addresses. It allows users to connect to each other either by using cables or wirelessly.

[edit] Repeaters
Main article: Repeater
A repeater is an electronic device that receives a signal and retransmits it at a higher level or higher power, or onto the other side of an obstruction, so that the signal can cover longer distances without degradation.
Because repeaters work with the actual physical signal, and do not attempt to interpret the data being transmitted, they operate on the Physical layer, the first layer of the OSI model.

[edit] Hubs
Main article: Network hub
A hub is a repeater with more than two ports, thus also being called "multiport repeater". It interconnects devices at the physical layer (layer 1) of the OSI model.. [5] It does this in a rudimentary way, it simply copies the data to all of the Nodes connected to the hub. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports. When a packet arrives at one port, it is copied the packets to all the ports of the hub. When the packets are copied, the destination address in the frame does not change to a broadcast address.

[edit] Bridges
Main article: Network bridge
A network bridge connects multiple network segments at the data link layer (layer 2) of the OSI model. Bridges do not promiscuously copy traffic to all ports, as does a hub. but learns which MAC addresses are reachable through specific ports. Once the bridge associates a port and an address, it will send traffic for that address only to that port. Bridges do send broadcasts to all ports except the one on which the broadcast was received.
Bridges learn the association of ports and addresses by examining the source address of frames that it sees on various ports. Once a frame arrives through a port, its source address is stored and the bridge assumes that MAC address is associated with that port. The first time that a previously unknown destination address is seen, the bridge will forward the frame to all ports other than the one on which the frame arrived.
Bridges come in three basic types:
Local bridges: Directly connect local area networks (LANs)
Remote bridges: Can be used to create a wide area network (WAN) link between LANs. Remote bridges, where the connecting link is slower than the end networks, largely have been replaced by routers.
Wireless bridges: Can be used to join LANs or connect remote stations to LANs

[edit] Switches
Main article: Network switch
Switches are a marketing term that encompasses routers and bridges, as well as devices that may distribute traffic on load or by application content (e.g., a Web URL identifier). Switches may operate at one or more OSI layers, including physical, data link, network, or transport (i.e., end-to-end). A device that operates simultaneously at more than one of these layers is called a multilayer switch.
Overemphasizing the ill-defined term "switch" often leads to confusion when first trying to understand networking. Many experienced network designers and operators recommend starting with the logic of devices dealing with only one protocol level, not all of which are covered by OSI. Multilayer device selection is an advanced topic that may lead to selecting particular implementations, but multilayer switching is simply not a real-world design concept.

[edit] Routers
Main article: Router
Routers are the networking device that forwards data packets along networks by using headers and forwarding tables to determine the best path to forward the packets. Routers work at the network layer (layer 3) of the OSI model. Routers also provide interconnectivity between like and unlike media.[3] This is accomplished by examining the Header of a data packet.[5] They use routing protocols such as Open Shortest Path First (OSPF) to communicate with each other and configure the best route between any two hosts. A router is connected to at least two networks, commonly two LANs or WANs or a LAN and its ISP's network. Some DSL and Cable Modems have been integrated with routers for home consumers.

[edit] Building a simple computer network
A simple computer network may be constructed from two computers by adding a network adapter (Network Interface Controller (NIC)) to each computer and then connecting them together with a special cable called a crossover cable. This type of network is useful for transferring information between two computers that are not normally connected to each other by a permanent network connection or for basic home networking applications. Alternatively, a network between two computers can be established without dedicated extra hardware by using a standard connection such as the RS-232 serial port on both computers, connecting them to each other via a special crosslinked null modem cable.
Practical networks generally consist of more than two interconnected computers and generally require special devices in addition to the Network Interface Controller that each computer needs to be equipped with. Examples of some of these special devices are hubs, switches and routers.

THE HISTORY OF NIGERIA

History of Nigeria
From MICHEAL AKWUOBI
Jump to: navigation, search
History of Nigeria

Early historyMigration & settlements
History before 1500First states
(1500-1800)Igbo and Savannah states
Colonization(1800-1960)
1960-1979Independence, military rule, and civil war
Civil War(1967-1970)
1979-1999Second republic, more military rule
(1999-present)Return of democracy
vde
Main article: Nigeria
Contents[hide]
1 Early history
2 Early states before 1500
3 Yoruba kingdoms and Benin
4 Oyo and Benin
5 Northern kingdoms of the Savanna
6 Kanem-Bornu Empire
7 Hausa states
8 Pre-colonial states, 1500-1800
8.1 Savanna states
8.2 The Ibibio (Efik/Ibibio/Annang)Kingdom
8.3 The Igbo States
9 A British sphere of influence
10 Independence
10.1 First Republic
10.2 First period of military rule
11 Second Republic
12 The abortive Third Republic
12.1 Sani Abacha
12.2 Abubakar's transition to civilian rule
13 Fourth Republic
14 Further reading
15 Notes
16 External links
//

[edit] Early history
Main article: Early Nigerian history
Recent archaeological research has shown that people were already living in south-western Nigeria (specifically Iwo-Eleru) as early as 9000 BC and perhaps earlier at Ugwuelle-Uturu (Okigwe) in south-eastern Nigeria.[1] Microlithic and ceramic industries were developed by savanna pastoralists from at least the 4th millennium BC and were continued by subsequent agricultural communities. In the south, hunting and gathering gave way to subsistence farming in the first millennium BC and the cultivation of staple foods. Primitive iron-West Africa, while Kainji Dam excavations revealed ironworking by the 2nd century BC. The transition from Neolithic times to the Iron Age apparently was achieved without intermediate bronze production. Some scholars speculate the smelting process was transmitted from the Mediterranean by Berbers. Others suggest the technology moved west from the Nile Valley, although the Iron Age in the Niger River valley and the forest region appears to predate the introduction of metallurgy in the upper savanna by more than 800 years. The earliest indentified Nigerian culture is the Nok people who thrived between 500 BC and 200 AD on the Jos Plateau in northeastern Nigeria. Information is lacking from the first millennium AD following the Nok ascendancy, but by the 2nd millennium AD there was active trade from North Africa through the Sahara to the forest with the savanna people acting as intermediaries in exchanges of various goods.

[edit] Early states before 1500
Main article: History of Nigeria before 1500
Long before 1500, much of modern Nigeria was divided into states identified with contemporary ethnic groups. These early states included the Yoruba kingdoms, The Igbo kingdom of Nri, the Edo kingdom of Benin, the Hausa cities, and Nupe. Additionally numerous small states to the west and south of Lake Chad were absorbed or displaced in the course of the expansion of Kanem, which was centered to the northeast of Lake Chad. Borno, initially the western province of Kanem, became independent in the late 14th century. Other states probably existed but the absence of archaeological data do not permit accurate dating. In the southeast, the earliest Igbo state was Nri which emerged in 900 AD. Despite its relatively small size geographically it is considered the cradle of Igbo culture.

Statue of the orisha Eshu, Oyo, Nigeria, c1920.

[edit] Yoruba kingdoms and Benin
Historically the Yoruba have been the dominant group on the west bank of the Niger. Of mixed origin, they were the product of periodic waves of migrants. The Yoruba were organized in patrilineal groups that occupied village communities and subsisted on agriculture. From about the 11th century adjacent village compounds, called ile, coalesced into numerous territorial city-states in which clan loyalties became subordinate to dynastic chieftains. Urbanization was accompanied by high levels of artistic achievement, particularly in terracotta and ivory sculpture and in the sophisticated metal casting produced at Ife. The Yoruba placated a luxuriant pantheon headed by an impersonal deity, Olorun, and included lesser deities who performed various tasks. Oduduwa was regarded as the creator of the earth and the ancestor of the Yoruba kings. According to myth Oduduwa founded Ife and dispatched his sons to establish it

[edit] Oyo and Benin
During the 15th century Oyo and Benin surpassed Ife as political and economic powers although Ife preserved its status as a religious center. Respect for the priestly functions of the oni of Ife was a crucial factor in the evolution of Yoruba ethnicity. The Ife model of government was adapted at Oyo, where a member of its ruling dynasty controlled several smaller city-states. A state council (the Oyo Mesi) named the alafin (king) and acted as a check on his authority. Their capital city was situated about 100 km north of present-day Oyo. Unlike the forest-bound Yoruba kingdoms, Oyo was in the savanna and drew its military strength from its cavalry forces, which established hegemony over the adjacent Nupe and the Borgu kingdoms and thereby developed trade routes farther to the north.
Yorubaland established a community in the Edo-speaking area east of Ife before becoming a dependency of Ife at the beginning of the 14th century. By the 15th century it became an independent trading power, blocking Ife's access to the coastal ports as Oyo had cut off the mother city from the savanna. Political and religious authority resided in the oba (king) who according to tradition was descended from the Ife dynasty. Benin, which may have housed 100,000 inhabitants at its height, spread over twenty-five square km that were enclosed by three concentric rings of earthworks. By the late 15th century Benin was in contact with Portugal (see Atlantic slave trade). At its apogee in the 16th and 17th centuries, Benin encompassed parts of southeastern yorubaland and the western Igbo.

[edit] Northern kingdoms of the Savanna

The Songhai Empire, c. 1500
Trade is the key to the emergence of organized communities in the savanna portions of Nigeria. Prehistoric inhabitants adjusting to the encroaching desert were widely scattered by the third millennium BC, when the desiccation of the Sahara began. Trans-Saharan trade routes linked the western Sudan with the Mediterranean since the time of Carthage and with the upper Nile from a much earlier date, establishing avenues of communication and cultural influence that remained open until the end of the 19th century. By these same routes, Islam made its way south into West Africa after the 9th century AD.
By then a string of dynastic states, including the earliest Hausa states, stretched across the western and central Sudan. The most powerful of these states were Ghana, Gao, and Kanem, which were not within the boundaries of modern Nigeria but indirectly influenced the history of the Nigerian savanna. Ghana declined in the 11th century but was succeeded by Mali Empire which consolidated much of the western Sudan in the 13th century. Following the breakup of Mali a local leader named Sonni Ali (1464 -1492) founded the Songhai Empire in the region of middle Niger and the western Sudan and took control of the trans-Saharan trade. Sunni Ali seized Timbuktu in 1468 and Jenne in 1473, building his regime on trade revenues and the cooperation of Muslim merchants. His successor Askiya Mohammad Ture (1493 - 1528) made Islam the official religion, built mosques, and brought Muslim scholars, including al-Maghili (d.1504), the founder of an important tradition of Sudanic African Muslim scholarship, to Gao.[2] Although these western empires had little political influence on the Nigerian savanna before 1500, they had a strong cultural and economic impact that became more pronounced in the 16th century, especially because these states became associated with the spread of Islam and trade. Throughout the 16th century much of northern Nigeria paid homage to Songhai in the west or to Borno, a rival empire in the east.

[edit] Kanem-Bornu Empire
Main article: Kanem-Bornu Empire
Borno's history is closely associated with Kanem, which had achieved imperial status in the Lake Chad basin by the 13th century. Kanem expanded westward to include the area that became Borno. The mai (king) of Kanem and his court accepted Islam in the 11th century, as the western empires also had done. Islam was used to reinforce the political and social structures of the state although many established customs were maintained. Women, for example, continued to exercise considerable political influence.
The mai employed his mounted bodyguard and an inchoate army of nobles to extend Kanem's authority into Borno. By tradition the territory was conferred on the heir to the throne to govern during his apprenticeship. In the 14th century, however, dynastic conflict forced the then-ruling group and its followers to relocate in Borno, where as a result the Kanuri emerged as an ethnic group in the late fourteenth and fifteenth centuries. The civil war that disrupted Kanem in the second half of the 14th century resulted in the independence of Borno.
Borno's prosperity depended on the trans-Sudanic slave trade and the desert trade in salt and livestock. The need to protect its commercial interests compelled Borno to intervene in Kanem, which continued to be a theater of war throughout the fifteenth and into the sixteenth centuries. Despite its relative political weakness in this period, Borno's court and mosques under the patronage of a line of scholarly kings earned fame as centers of Islamic culture and learning.

[edit] Hausa states

Map of Nigeria (source: CIA's The World Factbook)
Main article: Hausa Kingdoms
By the 11th century some Hausa states - such as Kano, Katsina, and Gobir - had developed into walled towns engaging in trade, servicing caravans, and the manufacture of various goods. Until the 15th century these small states were on the periphery of the major Sudanic empires of the era. They were constantly pressured by Songhai to the west and Kanem-Borno to the east, to which they paid tribute. Armed conflict was usually motivated by economic concerns, as coalitions of Hausa states mounted wars against the Jukun and Nupe in the middle belt to collect slaves or against one another for control of trade.
Islam arrived to Hausaland along the caravan routes. The famous Kano Chronicle records the conversion of Kano's ruling dynasty by clerics from Mali, demonstrating that the imperial influence of Mali extended far to the east. Acceptance of Islam was gradual and was often nominal in the countryside where folk religion continued to exert a strong influence. Nonetheless, Kano and Katsina, with their famous mosques and schools, came to participate fully in the cultural and intellectual life of the Islamic world. The Fulani began to enter the Hausa country in the 13th century and by the 15th century they were tending cattle, sheep, and goats in Borno as well. The Fulani came from the Senegal River valley, where their ancestors had developed a method of livestock management based on transhumance. Gradually they moved eastward, first into the centers of the Mali and Songhai empires and eventually into Hausaland and Borno. Some Fulbe converted to Islam as early as the 11th century and settled among the Hausa, from whom they became racially indistinguishable. There they constituted a devoutly religious, educated elite who made themselves indispensable to the Hausa kings as government advisers, Islamic judges, and teachers.

[edit] Pre-colonial states, 1500-1800
Main article: History of Nigeria (1500-1800)

[edit] Savanna states
During the 16th century the Songhai Empire reached its peak, stretching from the Senegal and Gambia rivers and incorporating part of Hausaland in the east. Concurrently the Saifawa Dynasty of Borno conquered Kanem and extended control west to Hausa cities not under Songhai authority. Largely because of Songhai's influence, there was a blossoming of Islamic learning and culture. Songhai collapsed in 1591 when a Moroccan army conquered Gao and Timbuktu. Morocco was unable to control the empire and the various provinces, including the Hausa states, became independent. The collapse undermined Songhai's hegemony over the Hausa states and abruptly altered the course of regional history.
Borno reached its apogee under mai Idris Aloma (ca. 1569-1600) during whose reign Kanem was reconquered. The destruction of Songhai left Borno uncontested and until the 18th century Borno dominated northern Nigeria. Despite Borno's hegemony the Hausa states continued to wrestle for ascendancy. Gradually Borno's position weakened; its inability to check political rivalries between competing Hausa cities was one example of this decline. Another factor was the military threat of the Tuareg centered at Agades who penetrated the northern districts of Borno. The major cause of Borno's decline was a severe drought that struck the Sahel and savanna from in the middle of the 18th century. As a consequence Borno lost many northern territories to the Tuareg whose mobility allowed them to endure the famine more effectively. Borno regained some of its former might in the succeeding decades, but another drought occurred in the 1790s, again weakening the state.
Ecological and political instability provided the background for the jihad of Usman dan Fodio. The military rivalries of the Hausa states strained the regions economic resources at a time when drought and famine undermined farmers and herders. Many Fulani moved into Hausaland and Borno, and their arrival increased tensions because they had no loyalty to the political authorities, who saw them as a source of increased taxation. By the end of the 18th century, some Muslim ulema began articulating the grievances of the common people. Efforts to eliminate or control these religious leaders only heightened the tensions, setting the stage for jihad.[2]

[edit] The Ibibio (Efik/Ibibio/Annang)Kingdom
The Ibibio Kingdom consists of speakers of varioua dialects of the Ibibio language (Efik, Ibibio, Annang). They inhabit the coastal Southeastern Nigeria and the coastal southwester Cameroon. They believe to have inhabitted the coastal southeastern Nigeria prior to the birth of Christ. Their coastal ports made them the first group in southeastern parts of Nigeria to have contact with European traders and missionaries. A popular weakness of the Ibibio (Efik/Ibibio/Annang) people is lack of central political leadership to organize the Efik/Ibibio/Annang under the common language that they all speak. The Obong of Calabar has been their well known ancient monarch.
The Ibibio gods were many, but for them, their mythology recognized a supreme God called Abasi.
One of their major secrete societies, the Ekpe Secrete Society developed one of the major ancient African script, the Nsibidi written script. They produced the first Nigerian Profesor, Professor Eyo Ita, who was the pioneer champion of youth movement in Nigeria for independence. He later became the first Premier of the former Eastern Region of Nigeria, and a member of the Nigerian team that negotiated Nigerian independence in Britain.
This Kingdom became one of the original Nigerian twelve states, the Southeastern State of Nigeria which was later split into two states, the Cross River State and Akwa Ibom State.

[edit] The Igbo States
The Onitsha Kingdom, which was originally inhabited by Igbos, was founded in the 16th century by migrants from Benin. Later groups like the Igalas and Igbo traders from the hinterland settled in Onitsha in the 18nth century. Another Igbo kingdom to form was the Arochukwu kingdom which emerged after the Aro-Ibibio wars from 1630-1720, and went on to form the Aro Confederacy which dominated midwestern and eastern Nigeria with pockets of influence in Equatorial Guinea and Cameroon.
Igbo gods, like those of the Yoruba, were numerous, but their relationship to one another and human beings was essentially egalitarian, reflecting Igbo society as a whole. A number of oracles and local cults attracted devotees while the central deity, the earth mother and fertility figure Ala, was venerated at shrines throughout Igboland.
The weakness of a popular theory that Igbos were stateless rests on the paucity of historical evidence of pre-colonial Igbo society. There is a huge gap between the archaeological finds of Igbo Ukwu, which reveal a rich material culture in the heart of the Igbo region in the 8th century, and the oral traditions of the 20th century. Benin exercised considerable influence on the western Igbo who adopted many of the political structures familiar to the Yoruba-Benin region. Ofega was the queen.

[edit] A British sphere of influence
Main article: Colonial Nigeria

Stamp of Southern Nigeria, 1901

Colonial Flag of Nigeria
Following the Napoleonic wars, the British expanded trade with the Nigerian interior. In 1885 British claims to a West African sphere of influence received international recognition and in the following year the Royal Niger Company was chartered under the leadership of Sir George Taubman Goldie. In 1900 the company's territory came under the control of the British Government, which moved to consolidate its hold over the area of modern Nigeria. On January 1, 1901 Nigeria became a British protectorate, part of the British Empire, the foremost world power at the time.
In 1914 the area was formally united as the Colony and Protectorate of Nigeria. Administratively Nigeria remained divided into the northern and southern provinces and Lagos colony. Western education and the development of a modern economy proceeded more rapidly in the south than in the north, with consequences felt in Nigeria's political life ever since. Following World War II, in response to the growth of Nigerian nationalism and demands for independence, successive constitutions legislated by the British Government moved Nigeria toward self-government on a representative and increasingly federal basis. By middle of the 20th century, when the great wave for independence was sweeping across Africa.

[edit] Independence
Main article: History of Nigeria (1960-1979)

Jaja Wachuku, First Nigerian Speaker of the House: 1959 - 1960
Nigeria was granted full independence in October 1960 under a constitution that provided for a parliamentary government and a substantial measure of self-government for the country's three regions. From 1959 to 1960, Jaja Wachuku was the First black Speaker of the Nigerian Parliament - also called the "House of Representatives". Wachuku replaced Sir Frederick Metcalfe of Great Britain. Notably, as First Speaker of the House, Jaja Wachuku received Nigeria's Instrument of Independence - also known as Freedom Charter, on October 1, 1960 from Princess Alexandra of Kent - HM The Queen of United Kingdom's representative at the Nigerian Independence ceremonies.
The federal government was given exclusive powers in defense, foreign relations, and commercial and fiscal policy. The British Monarch was still head of state but legislative power was vested in a bicameral parliament, executive power in a prime minister and cabinet, and judicial authority in a Federal Supreme Court. Political parties, however, tended to reflect the make up of the three main ethnic groups. The NPC (Nigerian people's Congress) represented conservative, Muslim, largely Hausa interests, and dominated the Northern Region. The NCNC (National Convention of Nigerian Citizens), was Igbo- and Christian-dominated, ruling in the Eastern Region, and the AG (Action Group) was a left-leaning party that controlled the Yoruba west. The first post-independence National Government was formed by a conservative alliance of the NCNC and the NPC, with Sir Abubakar Tafawa Balewa, a Hausa, becoming Nigeria's first Prime Minister. The Yoruba-dominated AG became the opposition under its charismatic leader Chief Obafemi Awolowo.

[edit] First Republic
Main article: Nigerian First Republic

Nnamdi Azikiwe, President of Nigeria 1963 - 1966
In October 1963 Nigeria proclaimed itself a Federal Republic, and former Governor General Nnamdi Azikiwe became the country's first President. From the outset Nigeria's ethnic and religious tensions were magnified by the disparities in economic and educational development between the south and the north. The AG was maneuvered out of control of the Western Region by the Federal Government and a new pro-government Yoruba party, the NNDP, took over. Shortly afterward the AG opposition leader, Chief Obafemi Awolowo, was imprisoned on treason charges that were later admitted to be without foundation. The 1965 National Election produced a major realignment of politics and a disputed result that set the country on the path to civil war. The dominant northern NPC went into a conservative alliance with the new Yoruba NNDP, leaving the Igbo NCNC to coalesce with the remnants of the AG (Action Group) in a progressive alliance. In the vote, widespread electoral fraud was alleged and riots irrupted in the Yoruba West where heartlands of the AG discovered they had apparently elected pro-government NNDP representatives.

[edit] First period of military rule
Main article: Nigerian Civil War
On January 15, 1966 a group of army officers, mostly southeastern Igbos, overthrew the NPC-NNDP government and assassinated the prime minister and the premiers of the northern and western regions. The federal military government that assumed power under General Aguiyi-Ironsi was unable to quiet ethnic tensions or produce a constitution acceptable to all sections of the country.[3] . Its efforts to abolish the federal structure raised tensions and led to another coup by largely northern officers in July, 1966 which established the leadership of Major General Yakubu Gowon. The subsequent massacre of thousands of Igbo in the north prompted hundreds of thousands of them to return to the southeast where increasingly strong Igbo secessionist sentiment emerged.
In a move towards greater autonomy to minority ethnic groups the military divided the four regions into 12 states. However the Igbo rejected attempts at constitutional revisions and insisted on full autonomy for the east. On May 29, 1967 Lt. Col. Emeka Ojukwu, the military governor of the eastern region who emerged as the leader of increasing Igbo secessionist sentiment, declared the independence of the eastern region as the Republic of Biafra. The ensuing Nigerian Civil War resulted in over 30,000 deaths before ending in the defeat of Biafra in 1970.[4]
Following the civil war the country turned to the task of economic development. Foreign exchange earnings and government revenues increased spectacularly with the oil price rises of 1973-74. On July 29, 1975 Gen. Murtala Mohammed and a group of officers staged a bloodless coup, accusing Gen. Yakubu Gowon of delaying the promised return to civilian rule and corruption. General Mohammed replaced thousands of civil servants and announced a timetable for the resumption of civilian rule by October 1, 1979. He was assassinated on February 13, 1976 in an abortive coup and his chief of staff Lt. Gen. Olusegun Obasanjo became head of state.

[edit] Second Republic
Main article: History of Nigeria (1979-1999)
A constituent assembly was elected in 1977 to draft a new constitution, which was published on September 21, 1978, when the ban on political activity was lifted. In 1979, five political parties competed in a series of elections in which Alhaji Shehu Shagari of the National Party of Nigeria (NPN) was elected president. All five parties won representation in the National Assembly. In August 1983 Shagari and the NPN were returned to power in a landslide victory, with a majority of seats in the National Assembly and control of 12 state governments. But the elections were marred by violence and allegations of widespread vote rigging and electoral malfeasance led to legal battles over the results.[5]
On December 31, 1983 the military overthrew the Second Republic. Major General Muhammadu Buhari emerged as the leader of the Supreme Military Council (SMC), the country's new ruling body. The Buhari government was peacefully overthrown by the SMC's third-ranking member General Ibrahim Babangida in August 1985. Babangida cited the misuse of power, violations of human rights by key officers of the SMC, and the government's failure to deal with the country's deepening economic crisis as justifications for the takeover. During his first days in office President Babangida moved to restore freedom of the press and to release political detainees being held without charge. As part of a 15-month economic emergency plan he announced pay cuts for the military, police, civil servants and the private sector. President Babangida demonstrated his intent to encourage public participation in decision making by opening a national debate on proposed economic reform and recovery measures. The public response convinced Babangida of intense opposition to an economic recovery package dependent on an International Monetary Fund (IMF) loan.

[edit] The abortive Third Republic
Main article: Nigerian Third Republic
President Babangida promised to return the country to civilian rule by 1990 which was later extended until January 1993. In early 1989 a constituent assembly completed a constitution and in the spring of 1989 political activity was again permitted. In October 1989 the government established two parties, the National Republican Convention (NRC) and the Social Democratic (SDP) - other parties were not allowed to register.
In April 1990 mid-level officers attempted unsuccessfully to overthrow the government and 69 accused plotters were executed after secret trials before military tribunals. In December 1990 the first stage of partisan elections was held at the local government level. Despite low turnout there was no violence and both parties demonstrated strength in all regions of the country, with the SDP winning control of a majority of local government councils.
In December 1991 state legislative elections were held and Babangida decreed that previously banned politicians could contest in primaries scheduled for August. These were canceled due to fraud and subsequent primaries scheduled for September also were canceled. All announced candidates were disqualified from standing for president once a new election format was selected. The presidential election was finally held on June 12, 1993 with the inauguration of the new president scheduled to take place August 27, 1993, the eighth anniversary of President's Babangida coming to power.
In the historic June 12, 1992 presidential elections, which most observers deemed to be Nigeria's fairest, early returns indicated that wealthy Yoruba businessman M.K.O. Abiola won a decisive victory. However, on June 23, Babangida, using several pending lawsuits as a pretense, annulled the election, throwing Nigeria into turmoil. More than 100 were killed in riots before Babangida agreed to hand power to an interim government on August 27, 1993. He later attempted to renege this decision, but without popular and military support, he was forced to hand over to Ernest Shonekan, a prominent nonpartisan businessman. Shonekan was to rule until elections scheduled for February 1994. Although he had led Babangida's Transitional Council since 1993, Shonekan was unable to reverse Nigeria's economic problems or to defuse lingering political tension.

[edit] Sani Abacha

Sani Abacha, military dictator of Nigeria from 1993 to 1998
With the country sliding into chaos Defense Minister Sani Abacha assumed power and forced Shonekan's resignation on November 17, 1993. Abacha dissolved all democratic institutions and replaced elected governors with military officers. Although promising restoration of civilian rule he refused to announce a transitional timetable until 1995. Following the annulment of the June 12 election the United States and others imposed sanctions on Nigeria including travel restrictions on government officials and suspension of arms sales and military assistance. Additional sanctions were imposed as a result of Nigeria's failure to gain full certification for its counter-narcotics efforts.
Although Abacha was initially welcomed by many Nigerians disenchantment grew rapidly. Opposition leaders formed the National Democratic Coalition (NADECO), which campaigned to reconvene the Senate and other disbanded democratic institutions. On June 11, 1994 Moshood Kashimawo Olawale Abiola declared himself president and went into hiding until his arrest on June 23. In response petroleum workers called a strike demanding that Abacha release Abiola and hand over power to him. Other unions joined the strike, bringing economic life around Lagos and the southwest to a standstill. After calling off a threatened strike in July the Nigeria Labour Congress (NLC) reconsidered a general strike in August after the government imposed conditions on Abiola's release. On August 17, 1994 the government dismissed the leadership of the NLC and the petroleum unions, placed the unions under appointed administrators, and arrested Frank Kokori and other labor leaders.
The government alleged in early 1995 that military officers and civilians were engaged in a coup plot. Security officers rounded up the accused, including former Head of State Obasanjo and his deputy, retired General Shehu Musa Yar'Adua. After a secret tribunal most of the accused were convicted and several death sentences were handed down. In 1994 the government set up the Ogoni Civil Disturbances Special Tribunal to try Ogoni activist Ken Saro-Wiwa and others for their alleged roles in the killings of four Ogoni politicians. The tribunal sentenced Saro-Wiwa and eight others to death and they were executed on November 10, 1995.
On October 1, 1995 Abacha announced the timetable for a 3-year transition to civilian rule. Only five political parties were approved by the regime and voter turnout for local elections in December 1997 was under 10%. On December 21, 1997 the government arrested General Oladipo Diya, ten officers, and eight civilians on charges of coup plotting. The accused were tried before a military tribunal in which Diya and eight others were sentenced to death. Abacha enforced authority through the federal security system which is accused of numerous human rights abuses, including infringements on freedom of speech, assembly, association, travel, and violence against women. After assuming power in June 1998 the Abubakar government took steps toward restoring worker rights and freedom of association for trade unions, which had deteriorated seriously under Abacha.

[edit] Abubakar's transition to civilian rule
Abacha died of heart failure on June 8, 1998 and was replaced by General Abdulsalami Abubakar. The military Provisional Ruling Council (PRC) under Abubakar commuted the sentences of those accused in the alleged coup during the Abacha regime and released almost all known civilian political detainees. Pending the promulgation of the constitution written in 1995, the government observed some provisions of the 1979 and 1989 constitutions. Neither Abacha nor Abubakar lifted the decree suspending the 1979 constitution, and the 1989 constitution was not implemented. The judiciary system continued to be hampered by corruption and lack of resources after Abacha's death. In an attempt to alleviate such problems Abubakar's government implemented a civil service pay raise and other reforms.
In August 1998 Abubakar appointed the Independent National Electoral Commission (INEC) to conduct elections for local government councils, state legislatures and governors, the national assembly, and president. The NEC successfully held elections on December 5, 1998, January 9, 1999, February 20, and February 27, 1999, respectively. For local elections nine parties were granted provisional registration with three fulfilling the requirements to contest the following elections. These parties were the People's Democratic Party (PDP), the All People's Party (APP), and the predominantly Yoruba Alliance for Democracy (AD). Former military head of state Olusegun Obasanjo, freed from prison by Abubakar, ran as a civilian candidate and won the presidential election. The PRC promulgated a new constitution based largely on the suspended 1979 constitution, before the May 29, 1999 inauguration of the new civilian president. The constitution includes provisions for a bicameral legislature, the National Assembly consisting of a 360-member House of Representatives and a 109-member Senate.

[edit] Fourth Republic
The emergence of democracy in Nigeria on May 1999 ended 16 years of consecutive military rule. Olusegun Obasanjo inherited a country suffering economic stagnation and the deterioration of most democratic institutions. Obasanjo, a former general, was admired for his stand against the Abacha dictatorship, his record of returning the federal government to civilian rule in 1979, and his claim to represent all Nigerians regardless of religion.
The new President took over a country that faced many problems, including a dysfunctional bureaucracy, collapsed infrastructure, and a military that wanted a reward for returning quietly to the barracks. The President moved quickly and retired hundreds of military officers holding political positions, established a blue-ribbon panel to investigate human rights violations, released scores of persons held without charge, and rescinded a numerous questionable licenses and contracts left by the previous regimes. The government also moved to recover millions of dollars in funds secreted in overseas accounts.
Most civil society leaders and Nigerians witnessed marked improvements in human rights and freedom of the press under Obasanjo. As Nigeria works out representational democracy, conflicts persist between the Executive and Legislative branches over appropriations and other proposed legislation. A sign of federalism has been the growing visibility of state governors and the inherent friction between Abuja and the state capitals over resource allocation.
Communal violence has plagued the Obasanjo government since its inception. In May 1999 violence erupted in Kaduna State over the succession of an Emir resulting in more than 100 deaths. In November 1999, the army destroyed the town of Odi, Bayelsa State and killed scores of civilians in retaliation for the murder of 12 policemen by a local gang. In Kaduna in February-May 2000 over 1,000 people died in rioting over the introduction of criminal Shar'ia in the State. Hundreds of ethnic Hausa were killed in reprisal attacks in southeastern Nigeria. In September 2001, over 2,000 people were killed in inter-religious rioting in Jos. In October 2001, hundreds were killed and thousands displaced in communal violence that spread across the states of Benue, Taraba, and Nasarawa. On October 1, 2001 Obasanjo announced the formation of a National Security Commission to address the issue of communal violence. Obasanjo was reelected in 2003.
The new president faces the daunting task of rebuilding a petroleum-based economy, whose revenues have been squandered through corruption and mismanagement. Additionally, the Obasanjo administration must defuse longstanding ethnic and religious tensions if it hopes to build a foundation for economic growth and political stability. Currently there is unrest in the Niger delta over the environmental destruction caused by oil drilling and the ongoing poverty in the oil-rich region.
A further major problem created by the oil industry is the drilling of pipelines by the local population in an attempt to drain off the petroleum for personal use or as a source of income. This often leads to major explosions and high death tolls.[6] Particularly notable disasters in this area have been: 1) October 1998, Jesse, 1100 deaths, 2) July 2000, Jesse, 250 deaths, 3) September 2004, near Lagos, 60 deaths, 4) May 2006, Ilado, approx. 150-200 deaths (current estimate).[7]
Two militants of an unknown faction shot and killed Ustaz Ja'afar Adam, a northern Muslim religious leader and Kano State official, along with one of his disciples in a mosque in Kano during dawn prayers on 13 April 2007. Obasanjo had recently stated on national radio that he would "deal firmly" with election fraud and violence advocated by "highly placed individuals." His comments were interpreted by some analysts as a warning to his Vice President and 2007 presidential candidate Atiku Abubakar.[8]
In the 2007 general election, Umaru Yar'Adua and Goodluck Jonathan, both of the People's Democratic Party, were elected President and Vice President, respectively. The election was marred by electoral fraud, denounced by other candidates and international observers.[9] [10]

[edit] Further reading
Nigerian First Republic
Nigerian Second Republic
Nigerian Third Republic
Nigerian Fourth Republic

[edit] Notes
^ Shaw, T.& Daniells, S. G. H. 1984. Excavations At Iwo-Eleru, Ondo State, Nigeria. West African Journal of Archsmelting furnaces at Taruga dating from the 4th century BC provide the oldest evidence of metalworking in aeology. Vol.14
^ a b Ira M. Lapidus, A History of Islamic Societies, Cambridge 1988
^ [www.conflictologist.narod.ru/nig66.html]
^ John de St. Jorre. The Nigerian Civil War. London:Hodder and Stoughton, 1972
^ Falola, Toyin, and Julius Omozuanvbo Ihonvbere. The Rise and Fall of Nigeria's Second Republic, 1979-1983. London: Zed Books, 1985
^ http://www.cnn.com/2006/WORLD/africa/05/12/nigeria.blast/index.html
^ http://news.independent.co.uk/world/africa/article364601.ece
^ Cleric killed in Nigeria mosque BBC News
^ "Nigeria election 'worst ever seen'", SMH News, 24 April 2007.
^ Tom Ashby, "Yar'Adua wins Nigeria poll 'charade'", Reuters (IOL), 24 April 2007.

[edit] External links
Upper and Lower Nigeria - Article from the historic Catholic Encyclopedia on Nigeria.
History of Nigeria - Offers a history of Nigeria from ancient days to the present.
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