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16 Julai 2010

Internetworking


Requirements of Internetworking
The overall requirements for an internetworking facility are as follows:
1.Provide a link between networks. At minimum, a physical and link control connection is needed.

2. Provide for the routing and delivery of data between processes on different networks.

3. Provide an accounting service that keeps track of the use of the various networks and routers and maintains status information.

4. Provide the services listed in such a way as not to require modifications to the networking architecture of any of the constituent networks. The internetworking facility must accommodate a number of differences among networks, including the following:
Different addressing schemes
Different maximum packet size
Different network access mechanisms
Different timeouts
Error recovery
Status reporting
Routing techniques
User access control
Connection, connectionless
Local area network (LAN)
A local area network (LAN) is a computer network covering a small physical area, like a home, office, or small groups of buildings, such as a school, or an airport. The defining characteristics of LANs, in contrast to wide area networks (WANs), include their usually higher data-transfer rates, smaller geographic area, and lack of a need for leased telecommunication lines.
wide area network (WAN)
A wide area network (WAN) is a computer network that covers a broad area (i.e., any network whose communications links cross metropolitan, regional, or national boundaries [1]). This is in contrast with personal area networks (PANs), local area networks (LANs), campus area networks (CANs), or metropolitan area networks (MANs) which are usually limited to a room, building, campus or specific metropolitan area (e.g., a city) respectively.

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