A customer is unable to Telnet into the Control Station of his NS600 from a Windows client. You
have verified that the Telnet service is enabled on the Control Station, and the customer has also
proved network connectivity is working because “ssh” and ftp work fine.
What would be the next step in finding out why Telnet is not working?

A.
Check for any firewalls blocking port 23

B.
Check for any firewalls blocking ports 20 & 21

C.
Ping the Control Station to make sure it is running

D.
Runtraceroute to verify the path to the Control Station