What is one advantage of using NAT at the edge of the network?
- Changing ISPs is simpler because the devices on the inside network do not have to be configured with new addresses when the outside address changes.
- Dynamic NAT allows devices from outside the local network to easily initiate TCP connections to inside hosts.
- NAT enables end-to-end IPv4 traceability, making troubleshooting easier.
- Performance is significantly increased because the router does not have to perform as many route lookups.
Explanation: When NAT is used, the inside network can be addressed with RFC 1918 private addresses and the outside address is provided by the ISP. When changing to a new ISP, the hosts on the inside network do not have to have their addresses changed. NAT prevents end-to-end IPv4 traceability, making troubleshooting more difficult. Performance can be adversely affected with NAT, as the router needs to change the IP, and possibly TCP/UDP headers on each packet. Dynamic NAT does not allow outside devices to easily initiate connections to inside devices unless an outbound connection has already been made.
Exam with this question: CCNA 3 v7 Module 6 Quiz - NAT for IPv4
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