Which of the following statements regarding OSPF protocol is false? A. Each OSPF router uses only one router-LSA to describe the local active connection status of an area. B. Routing information can…

Question

Options

• AEach OSPF router uses only one router-LSA to describe the local active connection status of an area.
• BRouting information can be advertised only between backbone and non-backbone areas and cannot be advertised directly between non-backbone areas.
• COSPFv3 supports four connection types: Point-To-Point, broadcast, and virtual link.
• DLink State ID in a Type 3 LSA indicates the router ID of an ABR.

• A
  4% (2)
• B
  18% (10)
• C
  7% (4)
• D
  71% (39)

Explanation

D is false because in a Type 3 (Summary) LSA, the Link State ID field contains the destination network address (the IP prefix being summarized), not the ABR's router ID - the ABR's identity appears in the separate Advertising Router field of the LSA header.

Why the distractors are true:

• A is true: each OSPF router generates exactly one Type 1 (Router-LSA) per area, listing all of its links within that area.
• B is true: OSPF's hierarchical design requires all inter-area routing to pass through Area 0; two non-backbone areas cannot exchange routes directly, which is precisely why virtual links exist.
• C is true: OSPFv3 inherits OSPF's network types - Point-to-Point, Broadcast, NBMA, Point-to-Multipoint, and Virtual Link - so the statement's characterization of supported connection types is accurate.

Memory tip: Think of Type 3 LSA as a "network summary postcard" - the Link State ID stamps the destination address on the front, while the Advertising Router field signs who sent it (the ABR). If you mix them up, remember: LSAs describe networks, not routers.

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