You have a single router with four subnets, as shown in the graphic. Each subnet

Question

You have a single router with four subnets, as shown in the graphic. Each subnet has the number of hosts specified. Select a subnet mask for subnet that will provide enough IP addresses with the least amount of wasted addresses.

Option A:

Subnet A=255.255.255.224

Subnet B=255.255.255.224

Subnet C=255.255.255.192

Subnet D=255.255.255.240

Option B:

Subnet A=255.255.224.0

Subnet B=255.255.224.0

Subnet C=255.255.128.0

Subnet D=255.255.240.0

Option C:

Subnet A=255.255.255.240

Subnet B=255.255.255.224

Subnet C=255.255.255.128

Subnet D=255.255.255.248

Option D:

Subnet A=255.255.255.240

Subnet B=255.255.255.240

Subnet C=255.255.255.192

Subnet D=255.255.255.248

Explanation / Answer

OPTION A is correct.

This is because as A and B subnets needs 25 and 20 hosts .. So closest one is 255.255.255.224,

C subnet needs 50 hosts so closest one is 255.255.255.192 with 62 hosts

and D needs 10 hosts so 255.255.255.240 is best choice

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