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By Jayant Narlikar

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In comparison, the MAC layer is responsible for providing access to the local area network, which enables a station on the network to transmit information. Later in this chapter we will examine the IEEE 802 standards in detail, including the functions and operation of the LLC and MAC layers. Layer 3 Ð the network layer The network layer (level 3) is responsible for arranging a logical connection between a source and destination on the network, including the selection and management of a route for the ¯ow of information between source and destination based upon the available data paths in the network.

Each layer consists of a set of functions designed to provide a de®ned series of services which relate to the mission of that layer. For example, the functions associated with the physical connection of equipment to a network are referred to as the physical layer. With the exception of layers 1 and 7, each layer is bounded by the layers above and below it. Layer 1, the physical layer, can be considered to be bound below by the interconnecting medium over which transmission ¯ows, while layer 7 is the upper layer and has no upper boundary.

4, which describes a token passing bus oriented network for both baseband and broadband transmission. This standard is similar to the Manufacturing Automation Protocol (MAP) standard developed by General Motors. The third LAN standard published by the IEEE was based upon IBM's speci®cations for its Token-Ring network. 5 standard, it de®nes the operation of Token-Ring networks on shielded twisted-pair cable at data rates of 1 and 4 Mbps. 5f committee speci®ed changes to the 4 Mbps ring for operations at 16 Mbps.

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