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Thread: Subnetting help

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  1. #1

    Subnetting help

    Right, im going over subnets again after doing them last year, i thought i had remembered it until the Cisco testerererer cd hit me with this: (I have put this in code tags as it allows spacing)

            Given the IP address & a subnet mask of what is the broadcast address:
            C: 172.156.32
    So I have done my working like this:
    IP = /27
    .                            | N | N | N | S |  H  |
    Broadcast:                               011 11111    =
    But the correct answer is D:
    I have tried to work through the example given again using ANDing:
    Subnet mask =
    IP                 =
    Only showing 'The intresting Octet':
    Subent =    224   =   11100000
    IP     =    100   =   01100100
    Network address =     01100000 = 96
    Broadcast       =     01111111 = 127
    Could the Cisco CD have a little error, or a i doing this the wrong way?

    I have worked through another example from the same CD:

    What is the broadcast for IP subnet, given a mask of

    So, /27

            | S  |    H    |
    224      111  00000
             001  00000    - Network
             001  11111    - Broadcast =
    Which, according to the CD is correct. Is the CD wrong? This is confusing me a lil.

    Thanks much

  2. #2
    May be you are right.There will be some mistake in cisco cd.

    Put your IP address and Subnet Mask.The result will be the same.

  3. #3
    Linux Newbie
    Join Date
    Mar 2005
    Yes, the CD is wrong. The broadcast address for is is the network address for the following subnet.
    You can only be young once. But you can always be immature.

  4. $spacer_open

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