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AWS Certified Solutions Architect study material · question 385 of 500

What does a NAT device do for instances in a private subnet?

  1. Assigns each instance its own public IPv4 address
  2. Terminates TLS on behalf of the instances
  3. Advertises the subnet's routes over BGP
  4. Maps many private IPv4 addresses to one public address for outbound connections
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Answer: D. Maps many private IPv4 addresses to one public address for outbound connections

NAT lets private instances start outbound connections while unsolicited inbound connections from the internet are refused.

Source: How Amazon VPC works (Amazon Web Services) — Access the internet

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