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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?

1. X sends an ARP request packet to the local gateway’s IP address which then finds the MAC address of Y and sends to X
2. X sends an ARP request packet to the local gateway’s MAC address which then finds the MAC address of Y and sends to X
3. X sends an ARP request packet with broadcast MAC address in its local subnet
4. X sends an ARP request packet with broadcast IP address in its local subnet

Correct answer: X sends an ARP request packet with broadcast MAC address in its local subnet

Solution

The correct option is effective because ARP (Address Resolution Protocol) uses a broadcast MAC address to reach all devices on the local subnet, allowing machine X to request the MAC address of machine Y, which will respond with its MAC address.

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