Question

A network administrator needs to open a port on a firewall to support a VPN using PPTP. Which port should the administrator open?

Answer 1

The network administrator should open port 1723 for a VPN using PPTP and also enable the GRE protocol which corresponds to protocol number 47.

Step-by-step explanation:

To support a VPN using Point-to-Point Tunneling Protocol (PPTP), a network administrator should open port 1723 on the firewall. This port is used for the TCP control channel for establishing and managing the VPN connection. Additionally, it is important to remember that for PPTP VPN to work correctly, the Generic Routing Encapsulation (GRE) protocol must also be enabled, which corresponds to protocol number 47, not a TCP or UDP port.