A host needs to reach another host on a remote network, but the ARP cache has no mapping entries. To what destination address will the host send an ARP request?
- the unicast MAC address of the remote host
- the broadcast MAC address
- the subnet broadcast IP address
- the unicast IP address of the remote host
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Explanation: ARP requests are sent when a host does not have an IP to MAC mapping for a destination in the ARP cache. ARP requests are sent to the Ethernet broadcast of FF:FF:FF:FF:FF:FF. In this example because the address of the remote host is unknown, an ARP request is sent to the Ethernet broadcast to resolve the MAC address of the default gateway that is used to reach the remote host. |