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You have a network ID of $192.168.10.0$ and require at least $25$ host IDs for each subnet, with the largest amount of subnets available. Which subnet mask should you assign?

  1. $255.255.255.192$
  2. $255.255.255.224$
  3. $255.255.255.240$
  4. $255.255.255.248$
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2 Answers

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To accomodate 25 host we need to to borrow 5 bits from host id part (class B address) so mask will be

255.255.255.111'00000' which is nothing but option B.
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We need 25 hosts , So the nearest number in power of 2 is 32 i.e 2^5=32 .

So, we need 5 bits for the hosts and rest 3 bits for subnets => 11100000 = 224

i.e 255.255.255.224

Option (b)
Answer:

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