In the days before CIDR (Classless Internet Domain Routing), networks were commonly organized by classes.
Which of the following would have been true of a Class A network?
A.
The first bit of the IP address would be set to zero.
B.
The first bit of the IP address would be set to one and the second bit set to zero.
C.
The first two bits of the IP address would be set to one, and the third bit set to zero.
D.
The first three bits of the IP address would be set to one.
Explanation:
Class A contains all addresses in which the most significant bit is zero. The address range of Class A is 0.0.0.0
– 127.255.255.255.Incorrect Answers:
B: Class A contains only one single fixed bit, not two.
C: Class A contains only one single fixed bit, not three.
D: Class A contains only one single fixed bit, not three.https://en.wikipedia.org/wiki/Classful_network