What is the advantage of using a multipoint interface instead of point-to-point subinterfaces when configuring a Frame Relay hub in a hub-and-spoke topology?

What is the advantage of using a multipoint interface instead of point-to-point subinterfaces when configuring a Frame Relay hub in a hub-and-spoke topology?
A . It avoids split-horizon issues with distance vector routing protocols.
B . IP addresses can be conserved if VLSM is not being used for subnetting.
C . A multipoint interface offers greater security compared to point-to-point subinterface configurations.
D . The multiple IP network addresses required for a multipoint interface provide greater addressing flexibility over point-to-point configurations.

View Answer

Answer: B

Explanation:

You do not have to assign a separate subnet per sub-interface .if you’re using a Class A network (10.x.x.x/8), you blow the whole network on a few connections (if you used VLSM, you could use a better mask, limit the addresses used). if you used 10.0.0.0/8, you would not be assigning the entire /8 to a single network. You would select a subnet mask for the network and then, you would have to use that mask with all subnets of the network. So if you chose a /24 mask, that would mean that you would have to use a /24 mask for even point-to-point links.