In the implementation of VLSM techniques on a network using a single Class C IP address, which
subnet mask is the most efficient for point-to-point serial links?
A.
255.255.255.0
B.
255.255.255.248
C.
255.255.255.254
D.
255.255.255.252
E.
255.255.255.240
Explanation:
For a single point to point link, only 2 IP addresses are required, one for the serial interface of the
router at each end. Therefore, the 255.255.255.252 subnet mask is often used for these types of
links, as no IP addresses are wasted.