OSPF (CCNP) Practice Questions

Answers and explanations appear when you work through the set above.

1. In OSPFv3 (OSPF for IPv6), which LSA has link-local flooding scope and tells the other routers on a link the originating router's link-local address and the IPv6 prefixes on that link?

   • Intra-Area-Prefix LSA (Type 9)
   • Link LSA (Type 8)
   • Inter-Area-Prefix LSA (Type 3)
   • Router LSA (Type 1)

2. During the OSPF neighbor state process, in which state do neighboring routers exchange Database Description (DBD) packets to determine master/slave roles and initial Sequence Numbers?

   • Init State
   • 2-Way State
   • ExStart State
   • Exchange State

3. Which OSPF network type requires explicit neighbor statements using the neighbor <IP> command and does NOT elect a Designated Router (DR) or Backup Designated Router (BDR)?

   • Broadcast
   • Non-Broadcast Multi-Access (NBMA) mode
   • Point-to-Multipoint Non-Broadcast
   • Point-to-Point

4. In an OSPF Not-So-Stubby Area (NSSA), which router translates incoming Type 7 LSAs into Type 5 LSAs before flooding them into Area 0?

   • Designated Router (DR) of the NSSA segment
   • Internal Area Router nearest the ASBR
   • ABR with the highest Router ID
   • ASBR that originated the Type 7 LSA

5. What Cisco IOS router configuration command adjusts the default OSPF reference bandwidth to correctly calculate interface metrics for links exceeding 100 Mbps?

   • ip ospf cost <value> under each interface
   • auto-cost reference-bandwidth <Mbps>
   • bandwidth <kbps> under each interface
   • ip ospf network point-to-point

6. Which OSPF Link State Advertisement (LSA) type is generated by an Area Border Router (ABR) to advertise reachability to an Autonomous System Boundary Router (ASBR) located in another area?

   • Type 1 Router LSA
   • Type 3 Summary LSA
   • Type 4 ASBR Summary LSA
   • Type 5 AS External LSA from the ASBR

7. Which LSA types are completely blocked from entering a standard Stub Area?

   • Type 3 Summary LSAs, with no default route
   • Type 4 ASBR Summary and Type 5 External LSAs
   • Type 1 Router and Type 2 Network LSAs
   • Type 7 NSSA External LSAs only

8. When OSPF learns paths of different route types to the same destination prefix, what is the order of path preference?

   • Intra-Area (O) > Inter-Area (O IA) > External Type 1 (O E1) > External Type 2 (O E2)
   • External Type 1 (O E1) > External Type 2 (O E2) > Intra-Area (O) > Inter-Area (O IA)
   • Inter-Area (O IA) > Intra-Area (O) > External Type 2 (O E2) > External Type 1 (O E1)
   • The lowest total cost wins, whatever the route type (O, O IA, O E1, or O E2) of each path.

9. On which OSPF network type is no Designated Router (DR) or Backup Designated Router (BDR) elected?

   • Broadcast
   • Non-Broadcast Multi-Access (NBMA)
   • Point-to-Point
   • Broadcast with ip ospf priority 1 on every router

10. In an OSPF Not-So-Stubby Area (NSSA), which router converts Type 7 LSAs into Type 5 LSAs before flooding them into the Backbone Area (Area 0)?

    • The ASBR that originated the Type 7 LSA, before it leaves the area.
    • The NSSA ABR with the highest Router ID.
    • The Designated Router on the backbone segment the ABR connects to.
    • Every router inside the NSSA, each translating its own Type 7 LSAs.

11. During OSPF adjacency formation, which state indicates that bidirectional communication has been established because a router sees its own Router ID in the neighbor's received Hello packet?

    • Init
    • 2-Way
    • ExStart
    • Exchange

12. What requirement must be met when establishing an OSPF Virtual Link to connect a non-backbone area to Area 0 across a transit area?

    • The transit area must be configured as a stub or NSSA area.
    • The transit area must be a regular area, not any type of stub.
    • Both routers must share the same physical link and subnet.
    • The virtual link must be built across Area 0 itself.

13. Which OSPF LSA Type is generated by an Area Border Router (ABR) to advertise reachability to networks located in other OSPF areas inside the same Autonomous System?

    • Type 1 (Router LSA)
    • Type 2 (Network LSA)
    • Type 3 (Summary LSA)
    • Type 5 (AS-External LSA)

14. Which operational behavior characterizes an interface configured with the OSPF network type ip ospf network point-to-multipoint?

    • It elects a DR and BDR based on the interface priority values.
    • It treats the segment as a set of point-to-point links, with no DR/BDR.
    • It requires static neighbor commands for every router on the subnet.
    • It drops multicast OSPF packets and sends Hellos only as unicast.

15. How does an Area Border Router (ABR) process Type 7 LSAs generated within an OSPF Not-So-Stubby Area (NSSA) when propagating them into Area 0?

    • It drops the Type 7 LSAs at the area boundary.
    • It translates them into Type 5 LSAs for Area 0.
    • It wraps the Type 7 LSAs inside Type 3 Summary LSAs.
    • It tunnels them to the backbone in GRE headers.