Answer:
Port 22
Explanation:
The Secure Sockets Layer (SSL) is a session-connection layer protocol that is responsible for data authentication and encryption for internet connections
The default SSH port for is Port 22..
The port 22 is used by SSH to activate encryption of data that is communicated via a public network connection( the public network connection could be a global network, a local network, the internet or internet access, ), hence, VPN functionality is provided.