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Computer Networks
OSI/TCP-IP Layers & Routing
GATE 2019
Medium

Suppose that in an IP-over-Ethernet network, a machine X wishes to find the MAC address of another machine Y in its subnet. Which one of the following techniques can be used for this?

  • AX sends an ARP request packet to the local gateway's IP address which then finds the MAC address of Y and sends to X
  • BX sends an ARP request packet to the local gateway's MAC address which then finds the MAC address of Y and sends to X
  • X sends an ARP request packet with broadcast MAC address in its local subnet
  • DX sends an ARP request packet with broadcast IP address in its local subnet

Explanation

ARP works by X broadcasting a request (to the broadcast MAC address FF:FF:FF:FF:FF:FF) containing Y's IP address; every host on the subnet receives it, but only Y (whose IP matches) replies with its MAC address.

Source: GATE CS 2019 (Set-2) (2019)

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