What is the purpose of port forwarding?

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#1

What is the purpose of port forwarding?

  1. Port forwarding allows an internal user to reach a service on a public IPv4 address that is located outside a LAN.
  2. Port forwarding allows users to reach servers on the Internet that are not using standard port numbers.
  3. Port forwarding allows for translating inside local IP addresses to outside local addresses.
  4. Port forwarding allows an external user to reach a service on a private IPv4 address that is located inside a LAN.

Explanation:
Port forwarding allows a user or program from outside to reach services inside a private network. It is not a technique that allows for using services with nonstandard port numbers. NAT or PAT convert inside IP addresses to outside local addresses.