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  1. Member
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    #1

    Default MS exams 0s and 1s ...

    This will be my next exam after 290, my question is on how the answers will asked do they add +2 (as in leaving the address the same as 2^4=16 and not 2^4=16-2)on the subnet side and -2 on the host side.

    I think this is kinda complicated to read but the rfc 1812 allow for the 1s and 0s to be counted on the subnet or the network side of the ip address is there a rfc for the router seein the 1s and 0s on the host side of the IP addess.

    Thanks Gateway ...
    Last edited by AndreL; 06-10-2010 at 05:51 PM.
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  3. Solutions Architect gateway's Avatar
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    #2
    Quote Originally Posted by AndreL View Post
    This will be my next exam after 290, my question is on how the answers will asked do they add +2 (as in leaving the address the same as 2^4=8 and not 2^4=8-2)on the subnet side and -2 on the host side.

    I think this is kinda complicated to read but the rfc 1812 allow for the 1s and 0s to be counted on the subnet or the network side of the ip address is there a rfc for the router seein the 1s and 0s on the host side of the IP addess.
    2^4=16

    Take a look at:
    Subnetting Made Easy
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  4. Senior Member Devilsbane's Avatar
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    #3
    Is there a lot of subnetting in the 291?
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  5. TaskStream Stalker arwes's Avatar
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    #4
    They do allow use of the scientific calculator in Windows during the exam, or so I've been told. I'll let you know for sure next week.
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  6. Go ping yourself... phoeneous's Avatar
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    #5
    Quote Originally Posted by AndreL View Post
    This will be my next exam after 290, my question is on how the answers will asked do they add +2 (as in leaving the address the same as 2^4=16 and not 2^4=16-2)on the subnet side and -2 on the host side.

    I think this is kinda complicated to read but the rfc 1812 allow for the 1s and 0s to be counted on the subnet or the network side of the ip address is there a rfc for the router seein the 1s and 0s on the host side of the IP addess.

    Thanks Gateway ...

    For the sake of the 291 exam, I think it is safe to say that you will always have to subtract 2 for the correct host ranges. So if I have 192.168.40.0/20 then I know my subnets are:

    192.168.40.0
    192.168.56.0
    192.168.72.0
    192.168.88.0
    etc..

    Each subnet has 4094 valid hosts, and those ranges are:

    192.168.40.1 - 192.168.55.254
    192.168.56.1 - 192.168.71.254
    192.168.72.1 - 192.168.87.254
    192.168.88.1 - 192.168.103.254
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  7. Senior Member Devilsbane's Avatar
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    #6
    According to CBT Nuggets you subtract 2 for the maximum available hosts, but do not need to for the maximum number of subnets.

    I learned subnetting about 2 years ago and was taught to subtract 2 for both. But according to James, you haven't had to subtract 2 from the subnet since 1995.
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