H12-821_V1.0 · Question #712
OSPF is a link state protocol. Link state information includes which of the following items? (Multiple choice)
The correct answer is A. Neighbor routers connected on the link B. Link type C. Link overhead D. Interface IP address and its mask. All four options are correct because OSPF Link State Advertisements (LSAs) carry a comprehensive snapshot of each router's local topology. Neighbor routers (A) are included so other routers know who is reachable via each link. Link type (B) - point-to-point, broadcast, stub…
Question
Options
- ANeighbor routers connected on the link
- BLink type
- CLink overhead
- DInterface IP address and its mask
How the community answered
(45 responses)- A100% (45)
Explanation
All four options are correct because OSPF Link State Advertisements (LSAs) carry a comprehensive snapshot of each router's local topology. Neighbor routers (A) are included so other routers know who is reachable via each link. Link type (B) - point-to-point, broadcast, stub, etc. - determines how OSPF forms adjacencies and elects a Designated Router. Link overhead/cost (C) is OSPF's metric, derived from interface bandwidth, and is used by the SPF algorithm to calculate the shortest path. Interface IP address and mask (D) are included so routers can build an accurate map of the network's addressing.
Since every option is correct here, there are no wrong distractors - this question tests whether you know the full scope of link state information, not just part of it.
Memory tip: Think of an LSA as a router's "business card" - it announces who its neighbors are, what kind of link connects them, how expensive that link is, and what address the link lives on. If you can picture that card, all four fields come naturally.
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