Which three statements correctly describe Network Device A?

Refer to the exhibit.

Which three statements correctly describe Network Device A? (Choose three.)

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, 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, 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.

Explanation:
If Subnet Mask is 255.255.255.128 the hosts vary from x.x.x.0 – x.x.x.127 & x.x.x.128-
x.x.x.255,so the IP Addresses of 2 hosts fall in different subnets so each interface needs an
IP an address so that they can communicate each other.
If Subnet Mask is 255.255.255.0 the 2 specified hosts fall in different subnets so they need a
Layer 3 device to communicate.
If Subnet Mask is 255.255.254.0 the 2 specified hosts are in same subnet so are in network
address and can be accommodated in same Layer 2 domain and can communicate with
each other directly using the Layer 2 address.