CCNA sample Q clarification

Discussion in 'Cisco' started by Carlos Trout, Jan 10, 2007.

  1. Carlos Trout

    Carlos Trout Guest

    Studying for the CCNA exam, I came across the following sample question:

    Which of the following is an example of a valid unicast host IP address?
    A. 172.31.128.255./18
    B. 255.255.255.255
    C. 192.168.24.59/30
    D. FFFF.FFFF.FFFF
    E. 224.1.5.2
    F. All of the above


    It looks like "none of the above" to me, but the stated answer was "A".
    Isn't 172.31.128.255/18 a broadcast address?


    Carlos
    Carlos Trout, Jan 10, 2007
    #1
    1. Advertising

  2. Carlos Trout wrote:

    >It looks like "none of the above" to me, but the stated answer was "A".
    >Isn't 172.31.128.255/18 a broadcast address?


    No, since 172.31.128.255/18 means 172.31.128.0 - 172.31.191.255

    Regards

    fw
    Frank Winkler, Jan 10, 2007
    #2
    1. Advertising

  3. No. Convert it in BITs and split according to subnet to network and host
    pieces:

    172.31.128.255 = 10101100 00011111 10 | 000000 11111111

    Network = 10101100 00011111 10
    Host = 000000 11111111

    Good luck,

    Mike
    ------
    Cisco IP Phone HEadset Adapters
    www.headsetadapter.com


    "Carlos Trout" <> wrote in message
    news:2007011010440716807%wampeter@fomacom...
    > Studying for the CCNA exam, I came across the following sample question:
    >
    > Which of the following is an example of a valid unicast host IP address?
    > A. 172.31.128.255./18
    > B. 255.255.255.255
    > C. 192.168.24.59/30
    > D. FFFF.FFFF.FFFF
    > E. 224.1.5.2
    > F. All of the above
    >
    >
    > It looks like "none of the above" to me, but the stated answer was "A".
    > Isn't 172.31.128.255/18 a broadcast address?
    >
    >
    > Carlos
    >
    headsetadapter.com, Jan 11, 2007
    #3
    1. Advertising

Want to reply to this thread or ask your own question?

It takes just 2 minutes to sign up (and it's free!). Just click the sign up button to choose a username and then you can ask your own questions on the forum.

Share This Page