medium
Single Answer
0After running nmap against a system on a network, Lucca sees that TCP port 23 is open and a service is running on it. What issue and resolution should he identify?
Answer Options
A
Low ports should not be open to the Internet and should be disabled.
B
Telnet is an insecure protocol and should be disabled.
C
SSH is an insecure protocol and should be disabled.
D
Ports 1–1024 are well-known ports and must be firewalled.
Correct Answer: B
Explanation
TCP port 23 is typically associated with Telnet, an unencrypted remote shell protocol. Since Telnet sends its authentication and other traffic in the clear (clear/plain text), it should not be used, and Lucca should identify this as a configuration issue involving an insecure protocol.