What will a host do first when preparing a Layer 2 PDU for transmission to a host on the same Ethernet network?

What will a host do first when preparing a Layer 2 PDU for transmission to a host on the same Ethernet network?

• It will search the ARP table for the MAC address of the destination host.
• It will query the local DNS server for the name of the destination host.
• It will initiate an ARP request to find the MAC address of the destination host.
• It will send the PDU to the router directly connected to the network.

Explique: In order to encapsulate a Layer 3 PDU into a frame, the sending host needs to know the MAC address of the destination host. The sending host first checks the ARP table. If a match is found in the table, the host uses the MAC address as the destination MAC in the frame. Otherwise, it will initiate an ARP request to obtain the destination MAC.

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