A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in its ARP cache. How will the device obtain a destination MAC address?
- It will send an ARP request for the MAC address of the destination device.
- It will send an ARP request for the MAC address of the default gateway.
- It will send the frame and use its own MAC address as the destination.
- It will send the frame with a broadcast MAC address.
- It will send a request to the DNS server for the destination MAC address.
Explanation: When a source host identifies that a destination IP address resides on a remote network segment, it must forward the packet to its default gateway (the local router) to reach that destination. Because Layer 2 Ethernet frames are designed for local delivery within the same segment, the host requires the physical MAC address of the gateway's interface to encapsulate the IP packet. If the ARP cache does not contain a mapping for the gateway's IP address, the host initiates an ARP request specifically for the default gateway's MAC address. The host does not request the MAC address of the final destination device, as that device is not on the local segment and cannot respond to local Layer 2 broadcast requests. Once the gateway's MAC address is resolved and stored in the cache, the host can successfully transmit the frame to the router for further delivery across the internetwork.
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