G tcpip or xns to communicate the similarity of

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Unformatted text preview: nd the trailer (7y from the frames before passing them on to the network layer. The application layer of the receiver's machine finally passes on the message in its original form to the communicating process on the receiver's node. Notice that the software of a particular layer on the sending machine conceptually communicates only with its peer layer on the receiving machine, although physically it communicates only with the adjacent layers on the sending machine. This abstraction is crucial to network design. INTERNETWORKING TOOLS Interconnecting of two or more networks to form a single network is called internetworking, and the resulting network is called an internetwork. Therefore, a WAN of multiple LANs is an internetwork. Internetworks are often heterogeneous networks composed of several network segments that may differ in topology and protocol. For example, an internetwork may have multiple LANs, some of which may have multi-access bus topology while others may have ring topology; some of these LANs may be using Ethernet technology which others may be using Token Ring technology; and some segments of the network may be using the IP suite while others may be using IBM's SNA (System Network Architecture) protocol suite. Internetworking allows these, relatively unrelated networks to evolve into a single working system. That is, the goal of internetworking is to hide the details of different physical networks, so that the resulting internetwork functions as a single . Interconnecting two networks having the same topology and protocol is simple because the two networks can easily communicate with each other. However, interconnecting two dissimilar networks that have different topologies and protocols requires an internetworking scheme that provides some common point of reference for the two networks to communicate with each other. That point of reference might be a high-level protocol common to the two networks, a device that allows interconnection of different topologies with different physical and electrical characteristics, or a protocol that allows operating environment differences to be ignored. The m...
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This document was uploaded on 04/07/2014.

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