am exits, and you will find yourself talking to your own computer. Microcomputer implementations of telnet generally include a terminal emulator for some common type of terminal. (See RFC's 854 and 855 for specifications for telnet. By the way, the telnet protocol should not be confused with Telenet, a vendor of commercial network services.)ICMPAnother alternative protocol is ICMP ("Internet control message protocol"). ICMP is used for error messages, and other messages intended for the TCP/IP software itself, rather than any particular user program. For example, if you attempt to connect to a host, your system may get back an ICMP message saying "host unreachable". ICMP can also be used to find out some information about the network. See RFC 792 for details of ICMP. ICMP is similar to UDP, in that it handles messages that fit in one datagram. However it is even simpler than UDP. It doesn't even have port numbers in its header. Since all ICMP messages are interpreted by the network software itself, no port numbers are needed to say where a ICMP message is supposed to go.ConclusionsRFC791 on the Internet protocol offers the following defintions of hostnames, IP addresses and routesA name indicates what we seek. An address indicates where it is. A route indicates how to get there.TCP/IP, the Internet Protocol suite is a layered communications protocol suite consisting of four layers and a large number of protocols. The four layers of TCP/IP are the ;application layer,Responsible for providing high level application services e.g. transferring files.transport layer,Protocols responsible for providing the ability to multiplex and deliver data to a remote machineinternet layer,Defines Internet addressing, routing and the Internet datagram.network access layer.Hides hardware implementation details from the Internet layers. Services include translating IP addresses into hardware addressesInternet standards are defined by Request for Comments (R...
