CCNA Routing and Switching (legacy) — Question 173

Which three statements about link-state routing are true? (Choose three.)

Answer options

• A. OSPF is a link-state protocol.
• B. Updates are sent to a broadcast address.
• C. It uses split horizon.
• D. Routes are updated when a change in topology occurs.
• E. RIP is a link-state protocol.
• F. Updates are sent to a multicast address by default.

Correct answer: A, D, F

Explanation

The correct answers, A, D, and F, highlight key characteristics of link-state routing protocols. OSPF is indeed a link-state protocol, routes are updated in response to topology changes, and updates are typically sent to a multicast address. In contrast, options B and C are incorrect as link-state protocols do not use broadcast for updates and do not employ split horizon like distance-vector protocols do. Additionally, RIP is not a link-state protocol, making option E incorrect.