CompTIA Network+ (N10-008) — Question 514

Which of the following does OSPF use to communicate routing updates?

Answer options

• A. Unicast
• B. Anycast
• C. Multicast
• D. Broadcast

Correct answer: C

Explanation

OSPF uses Multicast to send routing updates, specifically to the multicast address 224.0.0.5, which allows all OSPF routers on a segment to receive the updates efficiently. Unicast would send messages to a single destination, Anycast is used for routing to the nearest node, and Broadcast is not utilized in OSPF as it is less efficient for routing protocols.