On an Ethernet network PC1 sends a message to PC2 The messag

On an Ethernet network, PC1 sends a message to PC2. The message must cross two routers along the pathway. Which of the following statements are true concerning the communication between PC1 and PC2?

A. The frame header changes twice during the time it is sent from PC1 to finally reaching its destination at PC2.

B. The frame header changes three times during the time it is sent from PC1 to finally reaching its destination at PC2.

C. The packet header changes at each router in the delivery path.

D. The packet header never changes during the delivery path.

E. PC1 broadcasts a DNS message to determine PC2’s MAC address before building the frame.

F. PC1 broadcasts an ARP request to determine PC2’s MAC address before building the frame.

Solution

A, D, and F are correct. The frame header is removed and replaced by each router along the pathway. Therefore, the frame header will change twice during delivery. The packet information is never stripped off until it reaches its final destination. Finally, PC1 broadcasts an ARP message for PC2’s IP address, looking for a MAC. The router will respond.

B, C, and E are incorrect because these are all false statements.