Hi Tim, I have been studying with the same book and had the exact same question on chapter 3. If PC1 sends an ARP with destination ipv4 255.255.255.255, then the reader is owed an explanation, when the rest of the text examples of ARP requests have a specific, non-broadcast destination ipv4. as compared what is said elsewhere in the textbook. It is possible to have a case where the destination of the ARP request is a ipv4 broadcast address, the MAC dest is FFFF:FFFF:FFFF, and a host on the LAN replies. In my case it was a 2950 switch replying to a broadcast ping or arping made from Linux. I haven't practiced on enough Cisco hardware to know, however, if these results can be generalized to a router as in Wendell Odom's example. ARP is a protocol, but so is DHCP which replies to 255.255.255.255 DHCP requests. In the end it appears that the real-life implementation of the protocol has the final say in how closely it follows the theory.
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