Which of the following fields is/are modified in the IP header of a packet going out of a network address translation (NAT) device from an internal network to an external network?

Source IP
Destination IP
Header Checksum
Total Length

Correct answer: Source IP

Solution

The source IP address is modified by the NAT device to replace the internal IP with its own public IP, allowing the packet to be correctly routed on the external network.

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