OSPF (v2 and V3) CCIE-ENTERPRISE-INFRASTRUCTURE Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   What is the primary purpose of configuring an OSPF area as a stub area?

   • ATo enable the area to carry external routes without requiring a default route
   • BTo prevent any router in the area from becoming an ABR or ASBR
   • CTo reduce the size of the routing table by blocking Type 5 LSAs and replacing them with a default route
   • DTo allow the area to carry both inter-area and external routes while filtering only Type 3 LSAs
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   Which LSA types are permitted in an OSPF NSSA (Not-So-Stubby Area)?

   • AType 1, Type 2, Type 3, and Type 4
   • BType 1, Type 2, Type 3, and Type 7
   • CType 1, Type 2, Type 3, and Type 5
   • DType 1, Type 2, Type 4, and Type 5
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   What is the key difference between a stub area and an NSSA in OSPF?

   • AAn NSSA blocks Type 3 LSAs, while a stub area allows them.
   • BAn NSSA allows external routes to be injected into the area, while a stub area does not.
   • CA stub area allows Type 5 LSAs, while an NSSA does not.
   • DA stub area requires a virtual link, while an NSSA does not.
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A network engineer is deploying OSPF between two Cisco routers connected over a point-to-point Ethernet link. The routers are in the same area and have matching OSPF authentication, but they fail to form an adjacency. The engineer notices that one router has a Hello interval of 10 seconds and the other has a Hello interval of 30 seconds. What is the most likely cause of the adjacency failure, and what should be done to resolve it?

   • AThe router IDs are conflicting; assign unique router IDs to each router.
   • BThe Dead interval mismatch is preventing adjacency; adjust the Dead interval on one router to match the other.
   • CThe network type is mismatched; change both routers to point-to-point network type.
   • DThe Hello interval mismatch is preventing adjacency; configure both routers with the same Hello interval (and corresponding Dead interval).
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   Due to a network merger, an OSPF area 5 is not directly connected to area 0. The engineer needs to connect area 5 to the backbone without redesigning the physical topology. What should be configured?

   • ARedistribute area 5 routes into area 0.
   • BChange area 5 to a stub area.
   • CCreate a new OSPF process for area 5.
   • DA virtual link between area 5 and area 0 through a transit area.
   Reveal Solution Discussion Select an answer first