Which of the following would be the MOST efficient subnet mask for a point-to-point link?
A.
/28 B.
/29 C.
/31 D.
/32
C.
Which of the following would be the MOST efficient subnet mask for a point-to-point link?
A.
/28
B.
/29
C.
/31
D.
/32
C.
The most efficient subnet mask for a point-to-point link is /31, which allows for only two host addresses in the subnet.
A subnet mask is a 32-bit value used to determine the network and host portions of an IP address. The subnet mask divides an IP address into a network address and a host address. The size of the subnet mask determines the number of host addresses that can be used in a subnet.
In a point-to-point link, there are only two devices that need to communicate with each other, so only two host addresses are needed in the subnet. The /31 subnet mask provides the smallest possible subnet size, which is two host addresses.
The other subnet mask options provided in the question, /28 and /29, allow for more host addresses than necessary for a point-to-point link. /32 is not a valid subnet mask because it would result in a subnet with no host addresses, which is not useful for communication.
Therefore, the correct answer is C. /31 is the most efficient subnet mask for a point-to-point link.