Refer to the exhibit. Which three statements correctly describe Network Device A? (Choose three.)

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QUESTION 2

Refer to the exhibit. Which three statements correctly describe Network Device A? (Choose three.)

2

A. With a network wide mask of 255.255.255.128, each interface does not require an IP address.

B. With a network wide mask of 255.255.255.128, each interface does require an IP address on a unique IP subnet.

C. With a network wide mask of 255.255.255.0, it must be a Layer 2 device for the PCs to communicate with each other.

D. With a network wide mask of 255.255.255.0, it must be a Layer 3 device for the PCs to communicate with each other.

E. With a network wide mask of 255.255.254.0, each interface does not require an IP address.

Correct Answer: BDE

Section: IP Routing

Explanation

Explanation/Reference:

If the device is a Layer 2 transparent device (hub, bridge, switch) then the two PCs must be on the same subnet. The smallest subnet which would contain both of

the IP addresses is 10.1.0.0/23 with the range 10.1.0.0 up to 10.1.1.255. The mask for this is 255.255.254.0. On the other hand, if the device is a router, then we

would need a netmask smaller than 255.255.254.0 and we would have two subnets.

The masks of 255.255.255.128 and 255.255.255.0 are both smaller than 255.255.254.0, so this rules out A and C as the answer and confirms B and D as the

answer. E is the situation where we have the smallest subnet that contains both IP addresses, so we can have a Layer 2 device which does not require an IP

address.