## Refer to the exhibit. Host B on subnet Teachers transmits a packet to host D on subnet Students. Which Layer 2 and Layer 3 addresses are contained in the PDUs that are transmitted from host B to the router?

Last Updated on November 13, 2023 by InfraExam

## Refer to the exhibit. Host B on subnet Teachers transmits a packet to host D on subnet Students. Which Layer 2 and Layer 3 addresses are contained in the PDUs that are transmitted from host B to the router?

• Layer 2 destination address = 00-00-0c-94-36-dd
Layer 2 source address = 00-00-0c-94-36-bb
Layer 3 destination address = 172.16.20.200
Layer 3 source address = 172.16.10.200
• Layer 2 destination address = 00-00-0c-94-36-ab
Layer 2 source address = 00-00-0c-94-36-bb
Layer 3 destination address = 172.16.20.200
Layer 3 source address = 172.16.100.200
• Layer 2 destination address = 00-00-0c-94-36-ab
Layer 2 source address = 00-00-0c-94-36-bb
Layer 3 destination address = 172.16.20.200
Layer 3 source address = 172.16.10.200
• Layer 2 destination address = 00-00-0c-94-36-cd
Layer 2 source address = 00-00-0c-94-36-bb
Layer 3 destination address = 172.16.20.99
Layer 3 source address = 172.16.10.200
 Explanation & Hint: Based on the network diagram provided, when Host B in the subnet Teachers sends a packet to Host D in the subnet Students, the Layer 2 and Layer 3 addresses contained in the Protocol Data Units (PDUs) transmitted from Host B to the router would be: Layer 3 (Network Layer): Layer 3 Source Address: This would be Host B’s IP address, which is 172.16.10.200. Layer 3 Destination Address: This would be Host D’s IP address, which is 172.16.20.200. Layer 2 (Data Link Layer): Layer 2 Source Address: This would be Host B’s MAC address, which is 00-00-0c-94-36-bb. Layer 2 Destination Address: This would be the MAC address of the router’s interface on the Teachers subnet, which is 00-00-0c-94-36-ab. The data packet would be framed with these addresses when Host B transmits to the router because the destination host (Host D) is on a different subnet, so the packet needs to be directed to the router’s interface that Host B is connected to. The correct addresses for the packet transmission from Host B to the router based on the provided exhibit would be: Layer 2 destination address = 00-00-0c-94-36-ab Layer 2 source address = 00-00-0c-94-36-bb Layer 3 destination address = 172.16.20.200 Layer 3 source address = 172.16.10.200