CCNA Sample Questions

640-801

53. Which of the following belong to the ISDN TE2 function group? (Choose two)
    1. a router serial interface
    2. an ISDN phone
    3. a router ISDN BRI "U" interface
    4. a standard pc
    5. an ISDN terminal adapter

    Answer :A & D

54. Which protocol is used to look up an IP address from a known Ethernet address?
    1. TCP
    2. RARP
    3. ARP
    4. IP

    Answer :B

55. What could be the rationale behind using passive-interface command when configuring a router?
    1. Allows interfaces to share common IP addresses.
    2. Allows an interface to remain up without the aid of keepalives.
    3. Allows a router to send routing and not receive updates via that interface.
    4. Allows a routing protocol to forward updates that is missing its IP address.
    5. Allows a router to receive routing updates on an interface but not send updates via that interface.

    Answer :E

    Explanation:The passive-interface command is used to control the advertisement of routing information. The command enables the suppression of routing updates over some interfaces while allowing updates to be exchanged normally over other interfaces. For any interface specified as passive, no routing information will be sent. Routing information received on that interface will be accepted and processed by the router. This is often useful for DDR links such as ISDN.