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By M. Rhee

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Extra resources for Internet Security. Cryptographic Principles, Algorithms, Protocols

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With this scheme, the organisation has one network with many hosts because all of the hosts are at the same level. Subnetting is accomplished by the further division of a network into smaller subnetworks. When a network is subnetted, it has three portions: netid, subnetid and hostid. When the datagram arrives at a router, it knows that the first two octets (bytes) denote netid and the last two octets (bytes) define subnetid and hostid, respectively. 14) as the netid, the third octet (5) as the subnetid, and the fourth octet (23) as the hostid.

Most researchers seek new ways to develop and extend the improved technology, and millions of users want to solve new networking problems and improve the underlying mechanisms. The motivation behind revising the protocols arises from changes in underlying technology: first, computer and network hardware continues to evolve; second, as programmers invent new ways to use TCP/IP, additional protocol support is needed; third, the global Internet has experienced huge growth in size and use. This section examines a proposed revision of the Internet protocol which is one of the most significant engineering efforts so far.

Both LAP-B and SDLC are subsets of HDLC, but they include several additional features. 3. Network layer. The network layer is responsible for data transmission across networks. This layer handles the routing of data between computers. Routing requires some complex and crucial techniques for a packet-switched network design. To accomplish the routing of packets sending from a source and delivering to a destination, a path or route through the network must be selected. This layer translates logical network addressing into physical addresses and manages issues such as frame fragmentation and traffic control.

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