Subnetting question, why was the problem worked the way it was?

JockVSJockJockVSJock Posts: 1,118Member
Still working...

Here is another one that has stumped me from

Question: How many subnets and hosts per subnet can you get from the network

4096 subnets and 4094 hosts

If converting over to binary, this is the result:



I orginally took all of the 1 values and tried to use that to get the number of subnets, but that number is way to high.

Once I got the answer, they only used the 1 values from the 2nd and 3rd octect.

I'm confused on not using any of the values from the 1st octect and not sure.

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  • Ltat42aLtat42a Posts: 587Member ■■■□□□□□□□
    Remember, the network is a Class A network (default mask is So.... a /20 gives you an extra 12 bits for subnetting, 12 bits for hosts. 2(12) = 4096 (subnets); 2(12)-2 = 4094 (hosts).
  • SharkDiverSharkDiver Posts: 844Member
    Ltat4a is completely correct.
    The fact that is is a class A network is the third variable.
    If they had asked the same question of a network, you would get a different number of subnets, but the same number of hosts.
  • j-manj-man Posts: 143Member
    I've said it in the subnetting made easy thread but Always figure out what class network you're dealing with.

    Class A: first 8 bits are network
    Class B: first 16 bits are network
    Class C: first 24 are network

    Anything above 224.... you know the rest.
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