CISSP – Information Systems Security Management Professional (ISSMP) — Question 57

Which of the following ports is the default port for Layer 2 Tunneling Protocol (L2TP) ?

Answer options

• A. UDP port 161
• B. TCP port 443
• C. TCP port 110
• D. UDP port 1701

Correct answer: D

Explanation

The correct answer is D, as UDP port 1701 is the designated port for L2TP. The other options are incorrect because UDP port 161 is used for SNMP, TCP port 443 is used for HTTPS, and TCP port 110 is used for POP3 email retrieval, none of which are related to L2TP.