Subnet masks are often abbreviated using:

A.
a forward slash “/” and the number of “one” bits

B.
a backward slash “\” and the number of “one” bits

C.
a colon “:” and the number of “one” bits

D.
a semi-colon “;” and the number of “one” bits

Explanation:
Subnet masks are often abbreviated using a forward slash “/” and the number of “one” bits in the
mask. For example, a network 192.168.1.0 with a subnet mask of 255.255.255.0 can be
expressed as 192.168.1.0/24 (since 255.255.255.0 is 24 binary ones followed by eight binary
zeros.) Therefore, a /25 subnet is a subnet with a mask of 255.255.255.128, and a /26 subnet has
a mask of 255.255.255.192, etc.