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Exam CISSP-ISSMP topic 1 question 73 discussion

Actual exam question from ISC's CISSP-ISSMP
Question #: 73
Topic #: 1
[All CISSP-ISSMP Questions]

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

  • A. UDP port 161
  • B. TCP port 443
  • C. TCP port 110
  • D. UDP port 1701
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Suggested Answer: D 🗳️
by tld1486905 at Dec. 8, 2024, 9:42 p.m.

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tld1486905
4 months, 2 weeks ago
Selected Answer: D
L2TP uses the registered User Datagram Protocol (UDP) port 1701, and the whole L2TP packet is encapsulated within the UDP datagram. As per normal UDP operation, the tunnel initiator selects an available UDP port and sends port number 1701 to the UDP destination.
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