Which method is used by a PAT-enabled router to send incoming packets to the correct inside hosts?​

ccna2-exam-answers
ccna2-exam

#1

Which method is used by a PAT-enabled router to send incoming packets to the correct inside hosts?​

  1. **It uses the destination TCP or UDP port number on the incoming packet. ***
  2. It uses the source TCP or UDP port number on the incoming packet.
  3. It uses the source IP address on the incoming packet.
  4. It uses a combination of the source TCP or UDP port number and the destination IP address on the incoming packet.

Explanation:
A PAT-enabled router maintains a table that consists of a mapping of inside local IP addresses and TCP/UDP port numbers to outside local addresses and TCP/UDP port numbers. When traffic returns to the router from the public network, the router would compare the destination port to the PAT mapping table to determine to which inside host the traffic should be sent.