A security analyst noticed a colleague typing the following command:
‘Telnet some-host 443’
Which of the following was the colleague performing?
A.
A hacking attempt to the some-host web server with the purpose of achieving a distributed
denial of service attack.
B.
A quick test to see if there is a service running on some-host TCP/443, which is being routed
correctly and not blocked by a firewall.
C.
Trying to establish an insecure remote management session. The colleague should be using
SSH or terminal services instead.
D.
A mistaken port being entered because telnet servers typically do not listen on port 443.
Explanation:
telnet uses port 23. Shouldn’t it be D?
Telnet uses port 23 by default. You don’t need to specify it in a command. Considering Telnet is a tool and not a method for hacking, B makes the most sense.