easy
Single Answer
0Which is the default subnet mask for a Class A address?
Answer Options
A
255.0.0.0
B
255.255.0.0
C
255.255.255.0
D
255.255.255.255
Correct Answer: A
Explanation
The default subnet mask of a Class A address is 255.0.0.0 (/8). The default subnet mask of a Class B address is 255.255.0.0 (/16). The default subnet mask of a Class C address is 255.255.255.0 (/24). The mask 255.255.255.255 is reserved to define a specific IP address and is not part of classful addressing.
subnetting
ip-addressing
classful-addressing