ITPEC FE Morning October 2021 Question 31
ITPEC FE Morning October 2021 — Question 31 of 80
NAPT (Network Address Port Translation) — allows multiple devices with different private IPs to share a single global IP.
NAPT translates both the IP address and port number, so the router can track which internal device each connection belongs to.
- •NAPT — translates private IP + port → single public IP + unique port
- •DHCP — automatically assigns IP addresses to devices on a network
- •DNS — resolves domain names to IP addresses
- •RADIUS — authentication/authorization protocol for network access
Why not others:
- (a) DHCP — assigns IPs, does not translate or share them
- (b) DNS — name resolution, unrelated to IP sharing
- (d) RADIUS — used for access control, not address translation
Key rule: NAPT = many private IPs → one public IP (distinguished by port numbers). Also known as PAT or IP masquerading.
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