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Thread: Chapter 14 - Exam Preparation Questions and Answers [WAN]

  1. #1
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    Chapter 14 - Exam Preparation Questions and Answers [WAN]

    1) State three valid WAN Connectivity methods
    Code:
    1) PPP
    2) HDLC
    3) ATM

    2) State three of PPP characteristics
    Code:
    1) Can be used over analog Circuits
    2) encapsulates several routed protocols
    3) provides error correction

    3) On a frame relay network, What happens if a CIR is exceeded?
    Code:
    All trallic exceeding the CIR is marked discard eligible.

    4) State three methods that can be utilized when using a PPP Layer 2 Encapsulation
    Code:
    1) Compression
    2) Authentication
    3) Multi-link support

    5) When executing the command >> show frame-relay pc.
    The output was >> PVC STATUS=INACTIVE
    What does this mean?
    Code:
    The PVC is configured correctly on the local side, but there is a problem on the remote end ofthe PVC.

    6) How to enable the CHAP authentication with PAP?
    Code:
    By executing the following command :
    (config-if)# ppp authentication chap pap

    7) You are asked to perform a frame-relay connection troubleshooting, What is the first step would you perform?
    Code:
    Set the encapsulation of the interface to HDLC

    8) What is the default encapsulation on a serial interface?
    Code:
    HDLC

    9) What is the function of the DE bit?
    Code:
    It identifies the frame that are transmitted above the CIR

    10) What does this command configure?
    frame-relay interface-dlci
    Code:
    It configures the local DLCI on a sub interface

    11) If you had to connect your cisco router with another non-cisco router, What frame relay command would you use?
    Code:
    encapsulation frame-relay ietf

    12) State the difference between CSU/DSU and a modem?
    Code:
    A CSU/DSU converts digtal signals from a router to a leased line; a modem converts digtal signals from a router to a phone line.

    13) When doing a map output of a frame-relay, What two statistics appears?
    Code:
    1) The value of the local DLCI
    2) The status of the PVC that is configured on the router

    14) At what OSI layer does the WAN operates?
    Code:
    - Physical
    - Data Link

    15) What command allows you to verify the encapsulation type of a frame relay link?
    Code:
    show framerelay map

    16) What is the type of physical network does a default WAN classified as?
    Code:
    nonbroadcast multi access

    17) What is the purpose of inverse ARP?
    Code:
    To map all known DLCI to an ip address

    18) Refer to the exhibit, Router will not accept the command to configure the lmi type, What is the problem?
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    Code:
    the interface requires that the encapsulation frame-relay command be configured first.

    19) S0/0 is not responding to ping requests, What is the problem?
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    Code:
    S0/0 is not enabled and S0/0 needs to be enabled.

    20) Bigtime router is unable to authenticate to the Littletime router, What is the cause of this problem?
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    Code:
    The passwords do not match on the two routers.

    21) Administrator is unable to connect both routers, What is the problem?
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    Code:
    Username / Password is incorrectly set

    22) What does STATUS=ACTIVE Mean?
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    Code:
    The Frame Relay switch is correctly programmed with the DLCI and is operational.

  2. #2
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    23) Refer to the output, What WAN protocol is being used?
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    Code:
    Frame-relay

    24) What Frame-Relay Mechanism is used to build the map?
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    Code:
    Inverse ARP

    25) What is the operational status of R2?
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    Code:
    Functioning Correctly

    26) Host 1 wants to ping the Router at 192.168.1.254, Based on the ARP table of Host 1 what will Host 1 do?
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    Code:
    Send unicast ICMP packets to the DSL modem/router

    27) What can you conclude from this output?
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    Code:
    - LMI messages are being sent on DLCI 0.
    - The Frame Relay switch is not responding to LMI requests from the router.

  3. #3
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    28) Hosts in the Branch LAN can't access the internet, What is the problem?
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    Code:
    Change the address ofthe Branch router WAN interface.

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