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Module 3: Network Layer & Routing

20162m

Which one of the following protocols is NOT used to resolve one form of address to another one?
(i) DNS
(ii) ARP
(iii) DHCP
(iv) RARP

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Answer: (iii) DHCP

Why: DNS resolves a domain name to an IP address, ARP resolves an IP address to a MAC address, and RARP resolves a MAC address to an IP address — each maps one address form to another. DHCP instead dynamically assigns/leases an IP address and configuration parameters (subnet mask, default gateway, DNS server) to a host; it does not translate one address form into another.

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