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Module 3: Network Layer & Routing

20262m

Host A knows the IP address of Host B, and both hosts are on the same LAN. Host A does not have Host B's MAC address in its ARP cache. What happens first?

  • (i) Host A broadcasts an ARP request asking for the MAC address corresponding to Host B's IP address
  • (ii) Host A unicasts the IP packet directly to Host B
  • (iii) Host B broadcasts its MAC address
  • (iv) The router assigns a new IP address to Host A
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Answer: (i) Host A broadcasts an ARP request asking for the MAC address corresponding to Host B's IP address

ARP resolves IP to MAC. With no cache entry, Host A broadcasts an ARP request (destination MAC FF:FF:FF:FF:FF:FF) on the LAN. Only Host B replies, with a unicast ARP reply carrying its MAC address.

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