Dumps4download 200-120 Exam Question 3

Refer to the exhibit:

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

Options

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.

Correct Answer: B, D, E
Explanation/Reference:
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.
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