Join Greg Sowell for an in-depth discussion in this video Telnet, part of Foundations of Networking: Protocols and CLI Tools.
- [Voiceover] A very useful tool…with unexpected results is Telnet.…By default it isn't installed on Windows anymore,…but a simple Google can give you the steps to install.…On Windows 10, I can enter a simple command line statement…to install it.…The ISM /online /Enable-Feature…/FeatureName:TelnetClient.…All right. Now that I've got…the "operation completed successfully" message,…I'll go ahead and clear the screen.…
While the Telnet Utility allows me to Telnet into equipment…for remote administrative purposes,…it's also extremely useful for troubleshooting.…I looked up Google.com's MX record,…then traced down the A record associated with that entry.…I'm going to test SMTP on that mail server…by Telnetting into it.…From the command line, I'll simply enter Telnet,…then the IP address to connect to,…and last the port to connect on.…So in this case,…telnet 188.8.131.52,…then a space and the port number of 25.…
By default, Telnet wants to connect to port 23,…but in this case, you can see I changed it to port 25.…I have the prompt available for the mail server.…
Protocols are the lifeblood of modern communication. By the end of this course, you'll know what you need to troubleshoot any network connection and keep the communication flowing.
Note: This course maps to domain 3 of the MTA Networking Fundamentals exam.
- The role of protocols in networking
- Port addresses
- ARP and InARP
- DNS and NetBIOS
- HTTP and HTTPS
- Mail protocols
- Using command-line tools to troubleshoot protocols and routing