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Thread: Chapter 7 - Exam Preparation Questions and Answers

  1. #1

    Chapter 7 - Exam Preparation Questions and Answers

    1) What type of network will OSPF elect a backup route ?
    Code:
    nonhroadcast and broadcast multiaccess
    2) What is the maximum number of equal-cost paths that can be used in the OSPF ?
    Code:
    4
    3) What are the characteristics of OSPF ?
    Code:
    - It supports VLSM
    - It confines network instability to one area of the network.
    - It allows extensive control of routing updates.
    - It converges quickly.
    - It uses cost to determine the best route.
    - OSPF routers discover neighbors before exchanging routing information.
    4) What are the characteristics of OSPF areas?
    Code:
    - Areas may be assigned any number from 0 to 65535,
    - Area 0 is called the backbone area,
    - Multiple OSPF areas must connect to area 0,
    5) How do you calculate the OSPF cost ?
    Code:
    By bandwidth
    6) What is the default administrative distance of OSPF?
    Code:
    110
    7) What is a feasible successor route in EIGRP?
    Code:
    it is a backup route, stored in the topology table
    8) How do you configure OSPF and add network 192.168.30.0 /24 to area 0?
    Code:
    Router(config)#router ospf 1
    Router(config-router)#network 192.168.30.0 0.0.0.255 0
    9) What is the use of hierarchical design for large OSPF networks ?
    Code:
    - to configure network instability to singe areas of the network.
    - to speed up convergence.
    - to reduce routing overhead.
    10) What are the characteristics of EIGRP successor routes?
    Code:
    - A successor route is used by EIGRP to forward traffic to a destination.
    - A successor route may be backed up by a feasible successor route.
    11) What information does a router running a link-state protocol use to build its toplogical database?
    Code:
    - hello packets
    - LSAs from other routers
    Last edited by r.vector; 12-01-2012 at 05:04 AM.

  2. #2
    12) Why this network failed to converge ?
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    Code:
    The no auto-summary command needs to be applied to the routers.
    13) R1 is unable to establish OSPF neignbor relationship with R3 , what could be the reason for that?
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    Code:
    - The hello and dead interval timers are not set to the same values on R1 and R3.
    - R1 and R3 are configured in different areas.
    14) When issuing show ip eigrp neighbors command from router1 , what do you conclude from the output?
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    Code:
    Routing is not completely confsgured on Router3.
    15) Pinging the serial interface of RouterB from RouterA was successful, But unable to ping any of the subnets attached to RouterB.
    what could be the problem?
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    Code:
    The routing protocol has summarized on the classful boundary.
    16) assume that variance is not yet configured for EIGRP, What route would appear in the routing table?
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    Code:
    D 192.168.8.24 /30 [90/2681856] via 192.168.8.22, 00:27:50, Seria|0l0

  3. #3
    17) What if the configurations of R1 was applied on R2 ?
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    Code:
    Router R2 will obtain a full routing table, including a default route, from R1.
    18) Why there are multiple unequal cost paths to network : 192.168.81.0 on Serial0?
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    Code:
    The EIGRP topology table displays all routes to a destination.
    19) What would cause RouterA not to be adjacent with RouterB when running OSPF ?
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    Code:
    The value of the dead timers on the router are different.
    20) What is required for RouterA to exchange routing updates with RouterC ?
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    Code:
    As numbers must be changed to match on all the routers,
    21) What describes the loopback address that is configured on RouterB?
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    Code:
    It provides stability for the OSPF process on RouterB.
    It specifies that the router ID for RouterB should be 10.0.0.1.

  4. #4
    22) Why wasn't the router elected as the designated router?
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    Code:
    Router is not advertising the interface with address 221.130.149.10.
    23) Identify the current OSPF router ID for Router1 based on that figure
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    Code:
    208.149.23.194
    24) what router ID will be used if the router ID has not been manually set?
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    Code:
    172.16.5.1
    Last edited by r.vector; 11-26-2012 at 09:10 AM.

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