GIAC
GSEC · Question #168
GSEC Question #168: Real Exam Question with Answer & Explanation
The correct answer is D. UDP port 1701. L2TP uses UDP port 1701 as its default transport port, a fact defined in its original RFC specification.
Question
Which of the following ports is the default port for Layer 2 Tunneling Protocol (L2TP)?
Options
- ATCP port 443
- BUDP port 161
- CTCP port 110
- DUDP port 1701
Explanation
L2TP uses UDP port 1701 as its default transport port, a fact defined in its original RFC specification.
Common mistakes.
- A. TCP port 443 is reserved for HTTPS - secure web traffic over TLS/SSL - and is not associated with L2TP.
- B. UDP port 161 is used by SNMP (Simple Network Management Protocol) for polling and managing network devices, not for L2TP tunneling.
- C. TCP port 110 is the default port for POP3 (Post Office Protocol version 3), which is used to retrieve email from a mail server.
Concept tested. L2TP default UDP port 1701 assignment
Reference. https://www.rfc-editor.org/rfc/rfc2661
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