Telnet is a Network layer protocol. It is used to create connection remotely.
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TELNET Application layer services like Network Virtual Terminal are used to realise this. TELNET is the protocol used. Refer - Data Communication and Networking by Forouzan
full form of telnet is tele network.
Telnet
Windows: Open start menu, click "Run", type in "telnet" Linux: Open a Terminal window, type in "telnet"
Telnet does not encrypt anything; that is why it is too insecure to use as a network protocol.
A telnet program is essentialy a remote terminal application, used to connect to a remote computer and interact with it in text mode (command line) only. It operates over a TCP/IP network, and uses TCP port 23. The telnet conversation is completely open, not encrypted in any way, starting from the logon (username/password entry), and therefore should be avoided on untrusted networks, where it can be easily sniffed ("overheard" by anybody that analyzes the network traffic). A secure alternative to telnet is called ssh (secure shell).
Because the telnet session is in clear text and programs can capture the passwords to log in to telnet sessions.
SSH is more secure than Telnet.
Telnet provides not encrypted connectivity to servers and workstations through terminal type of connection. It uses command-line type.
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