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New CCNA – WAN Questions

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  • New CCNA – WAN Questions

    Question 1


    Which PPP subprotocol negotiates authentication options?
    A. NCP
    B. ISDN
    C. SUP
    D. LCP
    E. DLCI

    Answer: D


    Question 2


    A network administrator needs to configure a serial link between the main office and a remote location. The router at the remote office is a non-Cisco router. How should the network administrator configure the serial interface of the main office router to make the connection?
    A. Main(config)# interface serial 0/0
    Main(config-if)# ip address 172.16.1.1 255.255.255.252
    Main(config-if)# no shut
    B. Main(config)# interface serial 0/0
    Main(config-if)# ip address 172.16.1.1 255.255.255.252
    Main(config-if)# encapsulation ppp
    Main(config-if)# no shut
    C. Main(config)# interface serial 0/0
    Main(config-if)# ip address 172.16.1.1 255.255.255.252
    Main(config-if)# encapsulation frame-relay
    Main(config-if)# authentication chap
    Main(config-if)# no shut
    D. Main(config)# interface serial 0/0
    Main(config-if)#ip address 172.16.1.1 255.255.255.252
    Main(config-if)#encapsulation ietf
    Main(config-if)# no shut

    Answer: B


    Question 3


    Which two options are valid WAN connectivity methods? (Choose two)
    A. PPP
    B. WAP
    C. DSL
    D. L2TPv3
    E. Ethernet

    Answer: A C


    Question 4


    Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanisms?
    A. HDLC
    B. PPP
    C. X.25
    D. Frame Relay

    Answer: B

    Explanation


    PPP supports both synchronous (like analog phone lines) and asynchronous circuits (such as ISDN or digital links). With synchronous circuits we need to use clock rate.
    Note: Serial links can be synchronous or asynchronous. Asynchronous connections used to be only available on low-speed (<2MB) serial interfaces, but now, there are the new HWICs (High-Speed WAN Interface Cards) which also support asynchronous mode. To learn more about them please visit http://www.cisco.com/en/US/prod/coll...d80274424.html.

    Question 5


    Which command is used to enable CHAP authentication with PAP as the fallback method on a serial interface?
    A. (config-if)# authentication ppp chap fallback ppp
    B. (config-if)# authentication ppp chap pap
    C. (config-if)# ppp authentication chap pap
    D. (config-if)# ppp authentication chap fallback ppp

    Answer: C


    Explanation


    The command “ppp authentication chap pap” command indicates the CHAP authentication is used first. If it fails or is rejected by other side then uses PAP instead. If you want to use PAP first (then CHAP) you can use the “ppp authentication pap chap” command.

    Question 6


    Which of the following describes the roles of devices in a WAN? (Choose three.)
    A. A CSU/DSU terminates a digital local loop
    B. A modem terminates a digital local loop
    C. A CSU/DSU terminates an analog local loop
    D. A modem terminates an analog local loop
    E. A router is commonly considered a DTE device
    F. A router is commonly considered a DCE device

    Answer: A D E


    Explanation


    The idea behind a WAN is to be able to connect two DTE networks together through a DCE network. The network’s DCE device (includes CSU/DSU) provides clocking to the DTE-connected interface (the router’s serial interface).


    Question 7


    Which two statements about using the CHAP authentication mechanism in a PPP link are true? (Choose two)
    A. CHAP uses a two-way handshake.
    B. CHAP uses a three-way handshake.
    C. CHAP authentication periodically occurs after link establishment.
    D. CHAP authentication passwords are sent in plaintext.
    E. CHAP authentication is performed only upon link establishment.
    F. CHAP has no protection from playback attacks.


    Answer: B C
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