Telnet
One of the methods to grant remote access to a system is through Telnet. Telnet is the standard terminal-emulation protocol within the TCP/IP protocol series, and it is defined in RFC 854. Telnet allows users to log in remotely and access resources as if the user had a local terminal connection. Telnet is an old protocol and offers little security. Information, including account names and passwords, is passed in clear text over the TCP/IP connection.
Telnet makes its connection using TCP port 23. (A list of remote access networking port assignments is provided in Table 9-1 in the “Chapter Review” section.) As Telnet is implemented on most products using TCP/IP, and it is important to control access to Telnet on machines and routers when ...
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