CCIE Routing and Switching (legacy) — Question 8

Which statement about Cisco devices learning about each other through Cisco Discovery Protocol is true?

Answer options

• A. Each device sends periodic advertisements to multicast address 01:00:0C:CC:CC:CC.
• B. Each device broadcasts periodic advertisements to all of its neighbors.
• C. Each device sends periodic advertisements to a central device that builds the network topology.
• D. Each device sends periodic advertisements to all IP addresses in its ARP table.

Correct answer:

Explanation

The correct answer is A, as Cisco devices send their periodic advertisements to the specific multicast address 01:00:0C:CC:CC:CC to share their information. Option B is incorrect because while devices do share information, they specifically use the multicast address rather than broadcasting to all neighbors. Option C is not correct as there is no central device involved in the process, and option D is wrong since advertisements are not sent to IP addresses in the ARP table.