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  1. Senior Member
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    Nov 2015
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    #51
    Ok that was very clear and fair answer to Null0 and blackhole since far enough to know balancing now-so see how when in place and in action packets would go missing,when theres BH on one side thus either loss of packages or depending on transport layer tcp upd thus causing a lot of requests or getting errors in data transmitted.


    But still didnt grasp how you would know when having different vlsm networks which way to summarize them ?

    since in your example you gave just 1.0 /28 1.8/29 1.24/29
    thus confussion comes not knowing how did you choose to summarize 1.0 with 1.8 when they have separate masks,instead of summarizing same masks and leaving 1.0 to 1.7.and doing separate one for /29 network.

    thus not sure how different masks are used to combine such networks,btw i know this is out of ccna scope,but really interested to know while at small network this would be minor issue but as said on ISP line or along the lines of BGP it would be major impact.
    Last edited by pinkiaiii; 03-20-2016 at 04:07 PM.
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  3. Senior Member
    Join Date
    Apr 2014
    Location
    Ohio
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    300

    Certifications
    A+. net+, CCNA R&S
    #52
    For the sake of brevity, I'm going to give you a link to a great article.
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  4. Senior Member
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    Nov 2015
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    213
    #53
    So the way to do it,going by that article would be very close as another user here asked for reversing summary route instead of focusing on counting bits you focus on block that addresses fall thus,block size being marker as to your subnet mask and then getting your mask out of it-like in the articles example networks 1.0,2.0,3.64,4.128,4.192 =thus its not the mask one would need to look but third octets block size which falls onto 4th thus meaning 3 bits left out.
    Quite strange given that nobody covers such topic in ccna given that it most likely would be beneficial to know.
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  5. Junior Member Registered Member
    Join Date
    Sep 2017
    Posts
    3
    #54

    Default Route summarization :Name of the book

    Quote Originally Posted by mikearama View Post
    Those networks are remote, but that doesn't mean the entire 172.16.0.0 /16 is remote.

    This kinda scheme just takes a bit of planning, since the initial ip scheme wasn't well planned. If it was, then local and remote networks would be in completely different core subnets.

    You can group most of the subnets with 172.16.64.0 /18, which would cover 172.16.64.0 through 172.16.127.254

    Now you have a choice... either leave the other three lines in as they are, or summarize again. Personally, I'd summarize again with 172.16.128.0 /18, which covers 172.16.128.0 through 172.16.191.254

    I just wanted to get you techies thinking beyond the typical, easy, everyday subnetting question where everything fits into one summary address.

    HTH,
    Mike

    Anyone please recommend me some books that will help to this answer .
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