CompTIA Network+ (N10-009) — Question 86

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 communicate routing updates to all routers in the OSPF area, specifically targeting the address 224.0.0.5 for OSPF routers. Unicast and Anycast do not allow for the efficient distribution of updates to multiple routers simultaneously, while Broadcast is not used in IP networks for routing protocols like OSPF.