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You have a class A network address 10.0.0.0 with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?

A. 255.240.0.0

B. 255.248.0.0

C. 255.252.0.0

D. 255.254.0.0

E. 255.255.255.255

Answer: Option D

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Comments ( 2 )

  1. Shri Kant
    Shri Kant :
    6 months ago

    We cannot take 100 subnets,it would be minimum 128(2^7) subnets because 64 will not suffice.So in the subnet mask,we need to mask 7 more bits than in any class A IP address.so the subnet mask becomes 11111111.11111110.00000000.00000000 i.e 255.254.0.0

  2. Pratima Singh
    Pratima Singh :
    4 years ago

    Pls share the solution

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