NAT is able to stop ________.

• A. Scanning probes
• B. Sniffers from learning anything about the internal IP addresses of internal hosts
• C. Both A and B
• D. Neither A nor B

Answer: (C)

NAT hides internal addressing by translating private IPs to a public address space, so outside observers only see the NAT device and the public IPs, not the private internal addresses. This means unsolicited scanning attempts from the internet often cannot reach or identify internal hosts, because the NAT device either drops the probes or doesn’t map them to a specific internal host unless a port-forward rule exists. Likewise, sniffers on the outside cannot learn the real internal IPs because they’re seeing translated addresses rather than the private ones behind the NAT. In short, NAT obscures internal topology and blocks unsolicited inbound visibility, so it can stop both scanning probes and observers from learning internal IP addresses.