Which of the following ports is the default port for Layer 2 Tunneling Protocol (L2TP) ?
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A. B. C. D.D.
The correct answer is D. UDP port 1701.
Layer 2 Tunneling Protocol (L2TP) is a protocol used for virtual private network ( VPN) connections. It is used to tunnel traffic between two endpoints over an IP network. L2TP is often used in combination with the Internet Protocol Security (IPSec) protocol for encryption and authentication.
L2TP uses User Datagram Protocol (UDP) port 1701 for communication between endpoints. UDP is a connectionless protocol that does not establish a direct connection between endpoints, which makes it faster than Transmission Control Protocol (TCP).
Option A, UDP port 161, is used for Simple Network Management Protocol (SNMP) communication. Option B, TCP port 443, is used for Secure Sockets Layer (SSL) or Transport Layer Security (TLS) encrypted communication over the internet, commonly used for HTTPS traffic. Option C, TCP port 110, is used for Post Office Protocol version 3 (POP3) communication for email retrieval.
Therefore, the correct answer is D, UDP port 1701.