Abstract
The Transmission Control Protocol/Internet Protocol (TCP/IP) suite of networking protocols is currently the most widely used set of protocols for internetwork communication. IP provides the essential services that any internetworking protocol must provide and all the protocols above and below it depend on its services. IP also defines a specific packet format. Several fields in the IP header control the fragmentation and reassembly algorithm. Fragmentation can be expensive, so most IP implementations try to avoid it. The IP routing algorithm is extremely simple, and routing is usually performed by specialized routing nodes that do nothing else. Most IP implementations do support routing, so all that is required is to have a host node with more than a single network interface. The two major TCP/IP transport protocols are TCP and the User Datagram Protocol. Telnet is the remote terminal service of TCP/IP, allowing a user on one host to log in to another host.
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