Assuming a subnet mask of 255.255.248.0, three of the following addresses are valid host addresses. Which are these addresses? (Choose three.)
A. 172.16.9.0
B. 172.16.8.0
C. 172.16.31.0
D. 172.16.20.0
Which are these addresses?
Assuming a subnet mask of 255.255.248.0, three of the following addresses are valid host addresses. Which are these addresses? (Choose three.)
A. 172.16.9.0
B. 172.16.8.0
C. 172.16.31.0
D. 172.16.20.0
255.255.248.0 – gold number is 8, so
for example we have next subnets
172.16.0.0
172.16.8.0
172.16.16.0
and so on
SO, 172.16.8.0 is not host address
A&B are the only valid answers as they are in the same subnet 172.16.8.0/21
C & D are each in separate subnets
ACD is correct. They are valid addresses as they are not network IDs or broadcast addresses. The question did not state they had to be able to communicatie.