Packet Tracer OSPF Configuration Tutorial
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Questions and Answers

What is the OSPFv2 administrative distance noted in the content?

  • 120
  • 110 (correct)
  • 90
  • 100

    • How many interfaces are explicitly configured to advertise OSPF routes in the given router?

  • 2
  • 4
  • 1
  • 3 (correct)

    • Which command provides the OSPF process information including the router ID?

  • show ip route
  • show ip ospf (correct)
  • show ospf interface
  • show ip protocols

    • What is the maximum number of equal-cost paths allowed in this router's OSPF configuration?

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

    What does the command output indicate about the area defined as BACKBONE(0)?

    <p>It includes 3 interfaces.</p> Signup and view all the answers

    What occurs when the link between R1 and R2 fails?

    <p>R1 switches to R3 as the next-hop router.</p> Signup and view all the answers

    What is the default interval for OSPFv2 Hello packets on multiaccess networks?

    <p>10 seconds</p> Signup and view all the answers

    What happens if a router does not receive a Hello packet within the Dead interval?

    <p>The neighbor router is marked as unreachable.</p> Signup and view all the answers

    What is the relationship between the Hello interval and Dead interval in OSPFv2?

    <p>The Dead interval is four times the Hello interval.</p> Signup and view all the answers

    Which multicast address is used by OSPFv2 for Hello packets?

    <p>224.0.0.5</p> Signup and view all the answers

    What is the cost value for R1 reaching the 10.1.1.4/30 network via R3?

    <p>50</p> Signup and view all the answers

    How often are Hello packets sent on point-to-point networks by default?

    <p>10 seconds</p> Signup and view all the answers

    Which command is primarily used to verify that the desired interfaces are active with the correct IP addressing?

    <p>show ip interface brief</p> Signup and view all the answers

    What does the command 'show ip ospf neighbor' verify?

    <p>Adjacency with neighboring routers</p> Signup and view all the answers

    What happens to the link-state database if a neighbor is declared down?

    <p>It is flooded with information about the down neighbor.</p> Signup and view all the answers

    What command would prevent a router from sending Hello packets?

    <p>passive-interface</p> Signup and view all the answers

    What indicates that two routers have successfully formed an OSPFv2 adjacency?

    <p>Router IDs are displayed</p> Signup and view all the answers

    What happens to the routing table on R1 when the link with R2 is shut down?

    <p>It uses the backup route through R3.</p> Signup and view all the answers

    Which command would you use to check the routing table for expected routes after configuring OSPFv2?

    <p>show ip route</p> Signup and view all the answers

    If a router ID from a neighboring router is not visible in the OSPF neighbor command output, what does this suggest?

    <p>There is a network segmentation preventing communication</p> Signup and view all the answers

    Which command provides detailed information about the OSPF routing process itself?

    <p>show ip ospf</p> Signup and view all the answers

    What would be an appropriate next step if 'show ip ospf neighbor' does not show a FULL state for a neighboring router?

    <p>Verify interface IP addresses and configurations</p> Signup and view all the answers

    Which command will NOT help in verifying that OSPF is functioning correctly?

    <p>ping &lt;neighbor IP&gt;</p> Signup and view all the answers

    What is the purpose of the 'show ip protocols' command?

    <p>List routing protocols being used and their configuration</p> Signup and view all the answers

    In the OSPFv2 routing protocol, what is a common consequence of incorrectly configured IP addressing?

    <p>Inaccessibility of routes in the routing table</p> Signup and view all the answers

    What is the purpose of the Designated Router (DR) in a multiaccess OSPF network?

    <p>To distribute LSAs and maintain routing information.</p> Signup and view all the answers

    Why is a Backup Designated Router (BDR) necessary in a multiaccess OSPF network?

    <p>To take over if the Designated Router (DR) fails.</p> Signup and view all the answers

    What multicast address does the Designated Router (DR) use to communicate in OSPF?

    <p>224.0.0.5</p> Signup and view all the answers

    What happens to the status of routers if the DR in a multiaccess OSPF network fails?

    <p>The BDR will take over as DR.</p> Signup and view all the answers

    How is a router classified if it is neither the DR nor the BDR?

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

    Which command is used to configure passive interfaces in OSPF?

    <p>ip passive-interface</p> Signup and view all the answers

    What is the primary role of the network command in OSPF configuration?

    <p>To specify which interfaces to include in OSPF.</p> Signup and view all the answers

    What wildcard mask is typically used for multiaccess OSPF configurations?

    <p>0.0.0.0 with subnet mask</p> Signup and view all the answers

    What does a two-way adjacency indicate between non-DR and non-BDR routers?

    <p>The routers have established a neighbor relationship.</p> Signup and view all the answers

    Which factor will NOT prevent two routers from forming an OSPFv2 adjacency?

    <p>Matching subnet masks.</p> Signup and view all the answers

    What is the significance of the command 'show ip protocols' in OSPF?

    <p>It verifies vital OSPF configuration information.</p> Signup and view all the answers

    What is indicated by a router's output showing 'FULL/ -' state in the neighbor table?

    <p>The router has a fully established adjacency.</p> Signup and view all the answers

    Which of the following is a reason for OSPF routers not to communicate?

    <p>Their Hello and Dead intervals differ.</p> Signup and view all the answers

    What must be true for routers to successfully establish OSPF adjacency?

    <p>They must have configurations that align.</p> Signup and view all the answers

    Which command can be used to verify neighbor status in OSPF?

    <p>show ip ospf neighbor</p> Signup and view all the answers

    What will the 'Dead Time' indicate in the OSPF neighbor table output?

    <p>Time remaining before a neighbor is declared down.</p> Signup and view all the answers

    Which OSPF configuration issue may lead to a router not receiving updates from its neighbors?

    <p>Incorrect network command.</p> Signup and view all the answers

    When does the OSPF neighbor state transition from 'INIT' to '2-WAY'?

    <p>When two routers have received each other's Hello packets.</p> Signup and view all the answers

    Study Notes

    Point-to-Point OSPF Networks

    • Configure router IDs explicitly.
    • Use subnet mask to set the network command on R1 and quad-zero wildcard mask on R2.
    • Implement ip ospf interface command on R3 and configure passive interfaces.
    • Use show ip protocols and show ip route to verify OSPF operations.

    Multiaccess OSPF Networks

    • Multiaccess OSPF networks involve one router that manages LSAs distribution.
    • The network administrator should configure the elected router role.

    OSPF Designated Router (DR)

    • In multiaccess networks, a DR and BDR are elected for LSA management.
    • The DR collects and distributes LSAs using multicast address 224.0.0.5.
    • BDR passively listens and assumes DR role if the DR fails, while other routers become DROTHER.

    Failover Simulation

    • Simulate link failure between R1 and R2 by shutting down Gigabit Ethernet 0/0/0.
    • Verify routing updates to R3 as the next-hop router with a cost of 50.

    Hello Packet Intervals

    • OSPFv2 Hello packets are sent every 10 seconds to all OSPF routers (224.0.0.5).
    • Passive interfaces do not transmit Hello packets.
    • Dead interval defaults to 40 seconds (four times the Hello interval) for neighbor detection.

    Default Route Propagation

    • Complete Packet Tracer task to propagate a default route in OSPFv2 and verify connectivity.

    Verify Single-Area OSPFv2

    • Use show ip interface brief to check active interfaces and IP addresses.
    • Utilize show ip route to confirm expected routes in the routing table.
    • Additional commands for verification include show ip ospf neighbor, show ip protocols, show ip ospf, and show ip ospf interface.

    Verifying OSPF Neighbors

    • Employ show ip ospf neighbor to check adjacency status with neighbors.
    • Non-FULL states indicate adjacency issues due to mask mismatches, timer differences, or incorrect network commands.

    Checking OSPF Protocol Settings

    • The show ip protocols command displays OSPF process ID, router ID, and interface details for routing.
    • Maximum path is typically set to 4, with default administrative distance of 110.

    OSPF Process Information

    • Utilize the show ip ospf command to view OSPF process ID, router ID, and the number of interfaces in each area.
    • Check the last execution time of the SPF algorithm and the number of LSAs in the area.

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    Related Documents

    Cisco OSPFv2 Configuration PDF

    Description

    This quiz focuses on configuring Point-to-Point OSPF networks using Packet Tracer. It covers router ID setup, network command configurations with wildcard masks, and verification of OSPF operations. Ideal for those looking to grasp OSPFv2 in a single-area context.

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