Which of the following is a default subnet mask for class B addresses?
A)255.255.255.255
B)255.255.255.0
C)255.0.0.0
D)255.255.0.0

Question

Quizplus · Accepted Answer

The default subnet mask for a class B address is 255.255.0.0. This is because class B addresses have the first 16 bits reserved for the network portion and the remaining 16 bits for the host portion. Therefore, the default subnet mask for class B addresses should have the first 16 bits set to 1, which equates to 255.255.0.0. A is incorrect because this is a broadcast address. B is incorrect because this subnet mask is used for class C addresses, which have the first 24 bits reserved for the network portion. C is incorrect because this subnet mask is used for class A addresses, which have the first 8 bits reserved for the network portion.

Which of the Following Is a Default Subnet Mask for Class