If you use the Windows OS check out this link from Microsoft.
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/telnet_commands.mspx?mfr=true
Telnet: TELNET (TELetype NETwork) is a network protocol used on the internet or local area network (LAN) connections. It was developed in 1969 and standardized as IETF STD 8, one of the first Internet standards.
Follow some step:-
Step # 1: First, open a command prompt. To open a command prompt window, click Start, Run and then type in cmd and press Enter. You can also press the +R to open the Run prompt and then type in cmd in the open text box.
Step # 2: You need to know a remote mail server. If you are still in school or working, there is the excellent opportunity to use your University mail server or your company's mail server for this.
type in telnet RemoteMailServer 25 at the command prompt. The Remote mail server here in this command is the mail server of your school or company. It is usually mailhost..edu or compmail..com or something on those lines. When you press enter, you are shown a quick prompt that you are connecting to the remote mail server.
Step # 3: Introduce yourself to the mail server. Play around a bit.
type in helo mailhost at the command prompt. The mail server responds back with something like this
250 RemoteMailHost. Hello , pleased to meet you.
Step # 4: You can now enter your email address.
type in mail from: your email id @ blah.com
The mail server responds back with a 250 … sender ok
Step # 5: You can now enter your receipient's email address
type in rcpt to: recipient email id @ blah.com
The mail server responds back with a "Recipient OK" message
Step # 6: Now, you are ready to type in the body of the email message.
type in data and press enter.
Now, type your message and then finally press Enter. To end your message type in a single period "." . Your message is now in the queue
Step # 7: To complete and finish the process, type in quit and press enter. The mail server responds with a "Bye" after which you see a "Connection to host lost" message displayed.
go to control panel and go to progam and features and look for windows features click on it and scroll down until you find telnet and tick it hit ok and wait
after the process go to start ,go to run and type in telnet and voila you've got
telnet
Telnet use port number 23,and connected to TCP
Telnet use port number 23,and connected to TCP
what osi layers use telnet connections for remote use
Windows: Open start menu, click "Run", type in "telnet" Linux: Open a Terminal window, type in "telnet"
SSH is more secure than Telnet.
If you want better security, use secure shell (ssh) instead of telnet. Actually, don't use telnet at all if possible, as it transmits all information in plain text.
Telnet is a Network layer protocol. It is used to create connection remotely.
One disadvantage of telnet is that it is not secure, meaning people can read your passwords and other sensitive information. It is outdated and has no colors. It is fairly hard to use.
Telnet is similar to HTTP and FTP in that all three use the TCP protocol for connection-oriented
Telnet does not encrypt anything; that is why it is too insecure to use as a network protocol.
Use of SSH or VTY ACLs.
No, it uses TCP. See related link