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AWS Certified Solutions Architect study material · question 363 of 500

How does a NAT gateway handle the source address of an instance's outbound packet?

  1. It encapsulates the packet without changing addresses
  2. It swaps the private IPv4 source for the gateway's own and reverses it on the reply
  3. It leaves the source address unchanged and rewrites the destination
  4. It replaces the source with the instance's Elastic IP address
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Answer: B. It swaps the private IPv4 source for the gateway's own and reverses it on the reply

Both NAT gateway types translate the instance's private source address to the gateway's, and translate it back when the response returns.

Source: NAT gateways (Amazon Web Services) — NAT gateways

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