Refer to the exhibit. Which three statements correctly describe Network Device A? (Choose three.)
- With a network wide mask of 255.255.255.128, each interface does not require an IP address.
- With a network wide mask of 255.255.255.128, each interface does require an IP address on a unique IP subnet.
- With a network wide mask of 255.255.255.0, must be a Layer 2 device for the PCs to communicate with each other.
- With a network wide mask of 255.255.255.0, must be a Layer 3 device for the PCs to communicate with each other.
- With a network wide mask of 255.255.254.0, each interface does not require an IP address.
Explanation: The principle here is if the subnet mask makes two IP addresses 10.1.0.36 and 10.1.1.70 in the same subnet then the Network device A does not need to have IP addresses on its interfaces (and we don’t need a Layer 3 device here).
A quick way to find out the correct answers is notice that all 255.255.255.x subnet masks will separate these two IP addresses into two separate subnets so we need a Layer 3 device here and each interface must require an IP address on a unique IP subnet -> A, C are not correct while B, D are correct.
With 255.255.254.0 subnet mask, the increment here is 2 in the third octet -> the first subnet is from 10.1.0.0 to 10.1.1.255, in which two above IP addresses belong to -> each interface of Network device A does not require an IP address -> E is correct.
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