OSPF Fundamentals in Enterprise Routing
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Questions and Answers

What type of routing protocol is OSPF?

  • Distance-vector protocol
  • Path-vector protocol
  • Hybrid protocol
  • Link-state protocol (correct)

    • What is the purpose of a Link State Advertisement (LSA) in OSPF?

  • To select the best routing protocol for the network
  • To calculate the shortest path to other routers
  • To distribute routing information throughout the network
  • To describe the state of a router's links to its immediate neighbours (correct)

    • How do routers in an OSPF network build their routing tables?

  • By randomly selecting a route to each destination
  • By exchanging routing information with their neighbours
  • By periodically querying a central routing database
  • By using an algorithm like Edsger Dijkstra's SPF (correct)

    • What is the advantage of OSPF over some other routing protocols?

    <p>It can use less bandwidth and converge more quickly</p> Signup and view all the answers

    What happens when a link on a single OSPF router changes state?

    <p>A single link-state message is distributed throughout the network</p> Signup and view all the answers

    What is the purpose of the Link State Database (LSDB) in OSPF?

    <p>To store all the link-state messages received by a router</p> Signup and view all the answers

    What is the main disadvantage of link-state protocols?

    <p>They can be computationally intensive compared to distance-vector protocols.</p> Signup and view all the answers

    What is the primary scaling overhead in link-state protocols?

    <p>Coping with the frequency of LSA updates as the size of a link-state area increases.</p> Signup and view all the answers

    What is the role of area 0 in the OSPF network?

    <p>It acts as a central node and transmits link information of other areas.</p> Signup and view all the answers

    What type of LSAs are supported by the standard area?

    <p>1, 2, 3, 4, and 5 LSAs.</p> Signup and view all the answers

    How do distance-vector protocols compare to link-state protocols in terms of computation?

    <p>They require less computation.</p> Signup and view all the answers

    What is the total number of OSPF areas mentioned in the text?

    <p>5</p> Signup and view all the answers

    What is the purpose of LSA Type 1 packets?

    <p>To describe its own interfaces and carry information about its neighbors to adjacent routers</p> Signup and view all the answers

    What is the role of the Designated Router (DR) in generating LSA packets?

    <p>Generating LSA Type 2 packets</p> Signup and view all the answers

    What type of LSA packets are generated by the ASBR to advertise external redistributed routes into the OSPF's AS?

    <p>LSA Type 5</p> Signup and view all the answers

    What is the total number of LSA types supported by OSPF?

    <p>11</p> Signup and view all the answers

    Where do LSA Type 1 packets remain?

    <p>Within the same area of origin</p> Signup and view all the answers

    Which type of LSA packets are used by ABRs to advertise the ASBR route through their areas?

    <p>LSA Type 4</p> Signup and view all the answers

    What type of LSA packets are used by the ASBR to inform its neighbors within its networks?

    <p>LSA Type 1</p> Signup and view all the answers

    What is the purpose of LSA Type 2 packets?

    <p>To describe all routers connected to a segment directly</p> Signup and view all the answers

    What is assumed about the reader's knowledge in this article?

    <p>The reader has a good understanding of basic OSPF theory and is comfortable with OSPF concepts</p> Signup and view all the answers

    What is the purpose of LSA Type 6 packets?

    <p>To support multicast routing through OSPF</p> Signup and view all the answers

    What type of entry would an external route/prefix be seen as in other OSPF routers routing tables?

    <p>O E1 or E2</p> Signup and view all the answers

    What is the status of Multicast OSPF (MOSPF) in terms of support by Cisco?

    <p>It is not supported by Cisco and is expected to be retired soon</p> Signup and view all the answers

    What is the purpose of LSA Type 7 packets?

    <p>To mask LSA Type 5 packets and allow them to move through special areas</p> Signup and view all the answers

    What is the main function of the ABR in relation to LSA Type 7 packets?

    <p>To translate LSA Type 7 packets back to LSA Type 5 packets</p> Signup and view all the answers

    What is the purpose of LSA Type 8 packets in OSPFv2?

    <p>To transit BGP attributes through an OSPF network</p> Signup and view all the answers

    What is the practical application of Opaque LSAs (LSA Type 9, 10 & 11)?

    <p>To extend the capabilities of OSPF in MPLS traffic engineering</p> Signup and view all the answers

    What is the function of LSA Type 5 packets?

    <p>To convey BGP destinations through an OSPF network</p> Signup and view all the answers

    What is the main difference between LSA Type 8 packets in OSPFv2 and OSPFv3?

    <p>OSPFv2 uses LSA Type 8 for external attributes, while OSPFv3 uses it for link local attributes</p> Signup and view all the answers

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