Port 1723/TCP, UDP is used by which VPN protocol?

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Multiple Choice

Port 1723/TCP, UDP is used by which VPN protocol?

Explanation:
The main thing this tests is which VPN protocol uses port 1723 as its control channel. PPTP (Point-to-Point Tunneling Protocol) uses TCP on port 1723 to establish and manage the VPN connection. After the control connection is set up, PPTP carries the actual data inside a GRE (IP protocol 47) tunnel, not over UDP. That’s why port 1723 is the telltale port for PPTP. L2TP typically uses UDP port 1701, and when paired with IPsec it relies on other ports for IKE/NAT-T and ESP for payload. RDP and SSH are not VPN protocols and do not use 1723 for tunneling.

The main thing this tests is which VPN protocol uses port 1723 as its control channel. PPTP (Point-to-Point Tunneling Protocol) uses TCP on port 1723 to establish and manage the VPN connection. After the control connection is set up, PPTP carries the actual data inside a GRE (IP protocol 47) tunnel, not over UDP. That’s why port 1723 is the telltale port for PPTP.

L2TP typically uses UDP port 1701, and when paired with IPsec it relies on other ports for IKE/NAT-T and ESP for payload. RDP and SSH are not VPN protocols and do not use 1723 for tunneling.

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