CCNA Sample Questions

640-801

50. Which PPP authentication methods will you use when configuring PPP on an interface of a Cisco router? (Select two options.)
    1. SSL
    2. SLIP
    3. PAP
    4. LAPB
    5. CHAP
    6. VNP

    Answer :C, E

    Explanation :Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP) authenticate the endpoints on either end of a point-to-point serial link. Chap is the preferred method today because the identifying codes flowing over the link are created using a MD5 one-way hash, which is more secure that the clear-text passwords sent by PAP.

51. If NVRAM lacks boot system commands, where does the router look for the Cisco IOS by default?
    1. ROM
    2. RAM
    3. Flash
    4. Bootstrap
    5. Startup-.config

    Answer :C

    Explanation :Flash memory - Either an EEPROM or a PCMCIA card, Flash memory stores fully functional IOS images and is the default location where the router gets its IOS at boot time. Flash memory also can be used to store any other files, including configuration files.

52. 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.