ITPEC FE Subject A April 2026 Question 24
ITPEC FE Subject A April 2026 — Question 24 of 60
NAT converts between private and global IP addresses.
Private addresses (10.x, 172.16–31.x, 192.168.x) are not routable on the Internet. NAT rewrites the source address of outgoing packets to the router's global address, remembers the mapping, and restores the private address on the replies — which is what lets several computers share one global address.
Answer (b)
Why not others:
- (a) — describes a proxy or web cache, which stores content, not addresses
- (c) — describes an IDS/IPS or firewall inspecting traffic for attacks
- (d) — describes ordinary packet forwarding or switching, which any router does regardless of NAT
Key rule: NAT is address translation and nothing else. Options about caching content, inspecting for attacks or filtering destinations are describing other boxes that often sit in the same device.
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