A AND D. A HOST ONLY ARPS TO FIND MAC ADDRESSES OF OTHER HOSTS IN T...

8.

A and D. A host only ARPs to find MAC addresses of other hosts in the same subnet.

However, a host learns the IP address to MAC address mapping information from a

received ARP request. PC1 would send an ARP broadcast for R1’s 10.1.1.1 IP address,

which would cause PC1 to learn about R1’s MAC address, and R1 to learn PC1’s MAC

address. Similarly, because the first packet is going from PC1 to PC2, R2 will need

588 Appendix A: Answers to the “Do I Know This Already?” Quizzes

to send an ARP broadcast looking for PC2’s MAC address, through which PC2 will

learn R2’s MAC address, meaning that PC2 does not need to send an ARP broadcast

looking for R2’s MAC address.