OSPF Review (The Second Best Igp)

By Ray Aragon
Ray Aragon, System engineer
Ray, an accomplished Account Manager at Cisco, boasts over eight years of expertise serving public sector customers. His exceptional performance has earned him accolades, including the Chairman's Club award and the SE of the Year award in 2013
Quizzes Created: 1 | Total Attempts: 205
, System engineer
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Questions: 11 | Attempts: 205

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Internet Quizzes & Trivia

In information technology, the connection of one computer to another is what matters. Specialists refer to this as networking. The quiz below is on open shortest path first (OSPF) and it will help you better understand what you already know.


Questions and Answers
  • 1. 

    Which attribute does not apply to OSPF?

    • A.

      VLSM is supported

    • B.

      Route Summarization is supported

    • C.

      Split Horizon is supported

    • D.

      Link State within and Area is supported

    • E.

      All of the Above

    Correct Answer
    C. Split Horizon is supported
    Explanation
    Split Horizon is not "supported" in OSPF. I wonder WHY? Hmmm good question.

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  • 2. 

    Why Doesn't OSPF use Split Horizon or poison reverse?

    • A.

      Because poisoning is cruel.

    • B.

      OSPF uses a form of Split Horizon and Poison Reverse, called akuna matata.

    • C.

      OSPF was designed to provide a loop free topology and the requirement of Area 0 is one of these methods.

    • D.

      All of the Above

    Correct Answer
    C. OSPF was designed to provide a loop free topology and the requirement of Area 0 is one of these methods.
    Explanation
    Poison reverse was a hack!
    Split horizon as a concept sort of lives on with many protocols. Don't advertise out interfaces from where you learned the information. That just sounds like good life advice doesn't it?

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  • 3. 

    Within a Non-Area 0 Area, how is a loop free topology ensured?

    • A.

      Hot sausages

    • B.

      All routers share the same database of all links in the area and compute the Djisktra algorithm to on that same data set, this ensures a loop free environment. The "Link State Data Base" and mechanisms to ensure the LSDB is synchronized is very important in OSPF: mechanisms to update missing LSAs and to ensure synchronization are built into OSPF messages.

    • C.

      OSPF relies on EIGRP for its control plane

    • D.

      All of the Above

    Correct Answer
    B. All routers share the same database of all links in the area and compute the Djisktra algorithm to on that same data set, this ensures a loop free environment. The "Link State Data Base" and mechanisms to ensure the LSDB is synchronized is very important in OSPF: mechanisms to update missing LSAs and to ensure synchronization are built into OSPF messages.
    Explanation
    All routers in a non-Area 0 area of OSPF share the same database of all links in the area and compute the Dijkstra algorithm on that same dataset. This ensures a loop-free environment by allowing each router to have a complete and consistent view of the network topology. The "Link State Database" (LSDB) is crucial in OSPF, as it stores all the link state advertisements (LSAs) and ensures synchronization among routers. OSPF messages contain mechanisms to update missing LSAs and maintain LSDB synchronization, further enhancing the loop-free topology.

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  • 4. 

    When do you use OSPFv2 versus OSPFv3?

    • A.

      OSPFv2 is for IPv4 and OSPFv3 is for IPv6.

    • B.

      OSPFv3 is only available in ISR-G2 bundles with Advanced IP Services.

    • C.

      What happened to OSPFv1?

    • D.

      All of the Above

    Correct Answer
    A. OSPFv2 is for IPv4 and OSPFv3 is for IPv6.
    Explanation
    OSPFv2 is used when working with IPv4 networks, as it is specifically designed for this protocol. On the other hand, OSPFv3 is used for IPv6 networks, providing support for the newer version of the Internet Protocol. The statement "All of the Above" is not a valid explanation as it does not provide any specific information about when to use OSPFv2 versus OSPFv3.

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  • 5. 

    Below are the MCAST Addresses for OSPFv3: 224.0.0.5 is used when sending to ALL OSPF ROUTERs 224.0.0.6 is used when Routers send updates to the DR and BDR

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The given answer is false. The explanation for this is that the MCAST addresses for OSPFv3 are actually 224.0.0.5 and 224.0.0.6. 224.0.0.5 is used when sending to ALL OSPF ROUTERs, while 224.0.0.6 is used when routers send updates to the DR (Designated Router) and BDR (Backup Designated Router).

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  • 6. 

    OSPF use Protocol 89 for transport and EIGRP uses Protocol 88 for Transport

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The explanation for the given correct answer is that OSPF (Open Shortest Path First) uses Protocol 89 for transport, while EIGRP (Enhanced Interior Gateway Routing Protocol) uses Protocol 88 for transport. This means that OSPF and EIGRP use different protocols for communication and data exchange. Therefore, the statement "OSPF use Protocol 89 for transport and EIGRP uses Protocol 88 for Transport" is true.

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  • 7. 

    ASBR sends Type 3 LSAs into Area 0.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    ASBR (Autonomous System Boundary Router) is responsible for exchanging routing information between different autonomous systems. Type 3 LSAs (Link State Advertisements) are used to advertise inter-area routes. ASBRs send Type 5 LSAs into Area 0, not Type 3 LSAs. Therefore, the given statement is false.

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  • 8. 

    What is the acronym "ABR" short for?

    • A.

      All Boys Ride

    • B.

      A Big Router

    • C.

      Area Boundary Router

    • D.

      Area Border Router

    • E.

      All of the Above

    Correct Answer
    D. Area Border Router
    Explanation
    the Bigger acronym has the bigger word (in this case):
    ASBR = Boundary
    ABR = Border

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  • 9. 

    Intra-Area Routes are preferred of Inter-Area routes?

    • A.

      Not sure

    • B.

      When is this over?

    • C.

      True

    • D.

      False

    Correct Answer
    C. True
    Explanation
    Intra-Area routes are preferred over Inter-Area routes because they have a lower cost and are more efficient. Intra-Area routes are within a single area of a network, allowing for faster communication and less congestion. Inter-Area routes, on the other hand, involve communication between different areas, which can lead to higher costs and slower transmission speeds. Therefore, it is true that Intra-Area routes are preferred over Inter-Area routes.

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  • 10. 

    E1 routes include the cost to the ASBR in the OSPF Cost.

    • A.

      E1 is an external route that ASBRs redistribute into OSPF.

    • B.

      Historically, E2 was when the cost to get to the ASBR was insignificant versus the low bandwidth of the External link.

    • C.

      Yes

    • D.

      E2 was also a computationally easier way to handle external routes, since the cost was the same from all OSPF routers and no calculations had to be made.

    Correct Answer
    C. Yes
    Explanation
    The given explanation suggests that the answer is "Yes" because historically, E2 routes were used when the cost to reach the ASBR was insignificant compared to the low bandwidth of the external link. Additionally, E2 routes were computationally easier to handle since the cost was the same from all OSPF routers and no calculations were needed.

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  • 11. 

    The Link State DataBase is synchronized in OSPF -- across all routers.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    ALL ROUTERS: this is a trick question. I was asked this on an exam before. The answer is if the OSPF AREA has multiple Areas the LSDB will not be the same on ALL ROUTERS.

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Ray Aragon |System engineer |
Ray, an accomplished Account Manager at Cisco, boasts over eight years of expertise serving public sector customers. His exceptional performance has earned him accolades, including the Chairman's Club award and the SE of the Year award in 2013

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