An organization has a Class B Network and wishes to form subnets for 60…

2017

An organization has a Class B Network and wishes to form subnets for 60 departments. The subnet mask would be:

  1. A.

    255.255.64.0

  2. B.

    255.255.0.0

  3. C.

    255.255.252.0

  4. D.

    255.255.255.0

Attempted by 165 students.

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Correct answer: C

The correct answer is Option C. A default Class B network uses a mask of 255.255.0.0 (/16). To create 60 subnets, we need x bits such that 2x >= 60, which gives x = 6 bits. Borrowing 6 bits from the third octet creates a subnet mask of 11111100 in binary, which evaluates to 252. Thus, the mask is 255.255.252.0.

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