Your customer is concerned about security. He wants to make certain no one in the outside world can see the IP addresses inside his network. What feature of a router would accomplish this?

Question

Options

• APort forwarding
• BNAT
• CMAC filtering
• DFirewall

• A
  7% (3)
• B
  88% (38)
• C
  2% (1)
• D
  2% (1)

Explanation

NAT (Network Address Translation) is correct because it translates private internal IP addresses into a single public IP address before traffic leaves the network - meaning external parties only ever see the router's public IP, never the internal addresses like 192.168.x.x.

• Port forwarding (A) is a feature built on top of NAT, but it does the opposite of hiding - it exposes specific internal services to the outside world.
• MAC filtering (C) controls which devices can join a network based on hardware addresses, but MAC addresses aren't visible to the outside internet at all, so this solves a different problem.
• Firewall (D) blocks or allows traffic based on rules, but it doesn't hide or translate IP addresses - internal IPs can still appear in packet headers that pass through.

Memory tip: Think of NAT as a receptionist - all outside callers only get the front desk number (public IP), never the direct extensions of people inside the office (private IPs).

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