On a telecommunications network, the network address recognizes and categorizes it for the host of the network. They are original so that they are the only one. When someone wants to make smaller networks within the larger network, this is called subnets. LANs stands for local area networks. These networks are networks that are connect to other computers within the area.
Most of these computer networks that are considered to be local area networks can be found in schools and universities. There are specific ways to calculate the number of hosts on a given network. The subnet mask 255.255.255.224 would be appropriate for a network address range to be subnetted for up to eight LANs. Each LAN would contain 5 to 26 hosts.
A is not correct because it is a wildcard mask (not subnet mask).
This question is a bit unclear but we can suppose we have to begin with default subnet mask and subnet it. And the default subnet mask here should be class C: 255.255.255.0
For answer B: 252 = 1111 1100 -> with this subnet mask we can subnet up to 26 = 64 subnets but only 22 2 = 2 hosts per subnet -> B is not correct.
C is not correct because it is the default subnet mask of class C and that means we dont subnet it.
For answer E: 240 = 1111 0000 -> There are 24 = 16 subnets but only 24 2 = 14 hosts per subnet < 26 hosts -> E does not satisfy the second requirement (of 26 hosts per subnet).
For answer D: 224 = 1110 0000 -> There are 23 = 8 subnets and 25 2 = 30 hosts > 26 hosts -> This is the correct answer.
Note: The number 5 in with each LAN containing 5 to 26 hosts is just used to trick you and it does not have any effect on our answer.
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