Subnetting help

zeb1zeb1 Member Posts: 26 ■□□□□□□□□□
in Net Infra 70-291
hey all trying to get around subnetting this one is from trancender

Your company uses the Class C network address 192.168.50.0/24. You are required to assign network addresses so that Los Angeles can support 99 hosts, Denver can support 43 hosts, Phoenix can support 17 hosts and Seattle can support 7 hosts. All of your routers support classless interdomain routing (CIDR), variable-length subnet masks (VLSMs) and the use of subnets that contain all 0s and all 1s.

LA needs 99 host so it needs 7bits 10000000 (i use 99+1 then convert to bin)
so i get 192.168.50.128/25

Denver needs 43 host so 6bits 11000000
192.168.50.192/26

Phoenix needs 17 host so 8bits 11100000
192.168.50.224/27

Seattle needs 7 host so 4bits 11110000
192.168.50.240/28

i get my end Subnet Mask by 128+64+32+16+8+4+2+1
so LA 10000000 = 128
Denver 11000000 = 192 etc:

Though i am wrong can someone enlighten me on what im doing wrong. Thanks icon_rolleyes.gif

Should add their answers
LA = 192.168.50.0/25
D = .168/26
P = .192/27
S = .224/28
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Comments

  • astorrsastorrs Member Posts: 3,139 ■■■■■■□□□□
    Sounds like you had the right subnet types, but why did you choose to start LA at 128? What was wrong with 0?
    twitter: @astorrs
    profile: linkedin.com/in/astorrs
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  • zeb1zeb1 Member Posts: 26 ■□□□□□□□□□
    The reason i used .128 is because since there are 7 bits for the client, i used the left-most 1 bit for the network. The 1st left most bit added up = 128????

    Sorry im a little retarded when it comes to this
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  • georgemcgeorgemc Member Posts: 429
    Zeb,
    It looks like you're confusing your subnet mask with your actual subnets. You're coming up with the right mask but don't seem to be applying them correctly.
    zeb1 wrote:
    hey all trying to get around subnetting this one is from trancender

    Your company uses the Class C network address 192.168.50.0/24. You are required to assign network addresses so that Los Angeles can support 99 hosts, Denver can support 43 hosts, Phoenix can support 17 hosts and Seattle can support 7 hosts. All of your routers support classless interdomain routing (CIDR), variable-length subnet masks (VLSMs) and the use of subnets that contain all 0s and all 1s.

    LA needs 99 host so it needs 7 bits 10000000 (i use 99+1 then convert to bin)
    so i get 192.168.50.128/25

    A /25 or 255.255.255.128 subnet mask applied to 192.168.50.128/24 will give you two possible subnets:

    192.168.50.0 - 127 /25
    or
    192.168.50.128-255 /25

    Typically you'd want to place your larger subnets near the beginning of your available address range. So well use 192.168.50.0 /25 for LA
    Denver needs 43 host so 6 bits 11000000
    192.168.50.192/26

    A /26 or 255.255.255.192 subnet mask applied to 192.168.50.128/24 will give you four possible subnets:

    192.168.50.0 - 63 /26
    or
    192.168.50.64 - 127 /26
    or
    192.168.50.128 - 191 /26
    or
    192.168.50.192 - 255 /26

    Once again you want to place your larger subnets near the beginning of your available address range. So well use 192.168.50.128 /26 for Denver Remember, the first two 6-bit subnets (.0 -.63 and .64 - .127) are being used for LA (.0 - .127)
    Phoenix needs 17 host so 5 bits 11100000
    192.168.50.224/27

    A /27 or 255.255.255.224 subnet mask applied to 192.168.50.128/24 will give you eight possible subnets:

    192.168.50.0 - 31 /27
    or
    192.168.50.32 - 63 /27
    or
    192.168.50.64 - 95 /27
    or
    192.168.50.96 - 127 /27
    or
    192.168.50.128 - 159 /27
    or
    192.168.50.160 - 191 /27
    or
    192.168.50.192 - 223 /27
    or
    192.168.50.224 - 255 /27

    Once again you want to place your larger subnets near the beginning of your available address range. So well use 192.168.50.192 /27 for Pheonix Remember, the first six 5-bit subnets (.0 - .31, .32 -.63, .64 - .95 and .96 - .127 for LA, and .128 - .159 and .160 - .191 for Denver) are being used for LA (.0 - .127) and Denver (.128 - .191).
    Seattle needs 7 host so 4bits 11110000
    192.168.50.240/28

    You should be able to figure this one out now.
    Though i am wrong can someone enlighten me on what im doing wrong. Thanks icon_rolleyes.gif

    Hopefully, this has "enlightened" you. :D

    George
    WGU BS: Business - Information Technology Management
    Start Date: 01 October 2012
    QFT1,PFIT in progress.
    TRANSFERRED/COMPLETED: AGC1,BBC1,LAE1,QBT1,LUT1,QLC1,QMC1,QLT1,IWC1,INC1,INT1,BVC1,CLC1,MGC1, CWV1 BNC1, LIT1,LWC1,QAT1,WFV1,EST1,EGC1,EGT1,IWT1,MKC1,MKT1,RWT1,FNT1,FNC1, BDC1,TPV1 REQUIRED:
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  • zeb1zeb1 Member Posts: 26 ■□□□□□□□□□
    i think i have it, hopefully i dont forget before the test - Thursday!!!!

    Cheers heaps for the help
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  • georgemcgeorgemc Member Posts: 429
    Good Luck! :D
    WGU BS: Business - Information Technology Management
    Start Date: 01 October 2012
    QFT1,PFIT in progress.
    TRANSFERRED/COMPLETED: AGC1,BBC1,LAE1,QBT1,LUT1,QLC1,QMC1,QLT1,IWC1,INC1,INT1,BVC1,CLC1,MGC1, CWV1 BNC1, LIT1,LWC1,QAT1,WFV1,EST1,EGC1,EGT1,IWT1,MKC1,MKT1,RWT1,FNT1,FNC1, BDC1,TPV1 REQUIRED:
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  • CingularCingular Member Posts: 81 ■■■□□□□□□□
    Wow, that was a very good explanation georgemc!

    I had a good question lined up but I had answered it by the end of typing it, haha.


    Oh well. icon_thumright.gif
    cissp, pcnse, ccnp, ccnp security, nse4
    ---

    "It's too bad she won't live. But then again, who does?" - Gaff 

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