Secure Shell Versus Telnet
Many network engineers commonly use Telnet to remotely connect to their routers; however, Cisco strongly recommends using Secure Shell (SSH) instead of Telnet.
The issue with Telnet is that it sends data (including passwords) across a network in clear text. This opens the door for a malicious user to launch a man-in-middle attack and use packet capture software to read the contents of the Telnet session’s packets.
Fortunately, SSH encrypts this traffic. So, even if a malicious user did capture packets from the SSH session, the packets would be unreadable.
The steps to configure SSH on a router are as follows:
Step 1. ...
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