A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in the ARP cache. How will the device obtain a destination MAC address?

When a host needs to communicate with a device on a remote LAN segment and finds that there are no mappings in its ARP cache, it must determine the MAC address of the remote device to encapsulate the packet within a frame. Since the device is on a different LAN segment, the host will first send the packet to its default gateway (typically a router).

To find out the MAC address associated with the IP address of the remote device, the host will generate an ARP (Address Resolution Protocol) request. This request is broadcasted to the local network segment, asking, "Who has IP address X.X.X.X? Tell me your MAC address." The device that has the corresponding IP address will reply with its MAC address.

This process is essential because devices within the same broadcast domain can directly communicate using their MAC addresses, but for devices on different networks, the default gateway must be used to forward the packet. Once the host obtains the MAC address from the ARP reply, it can then encapsulate the packet and send it to the default gateway for further routing to the destination.

Broadcasting a DHCP request would be irrelevant in this context as DHCP is meant for obtaining an IP address, not for resolving MAC addresses. Sending a ping would only check