Subnetting Quiz
Questions: 16 · 10 minutes
1. What CIDR prefix corresponds to the subnet mask 255.255.255.192?
/24
/25
/26
/27
2. How do the address ranges 10.0.0.0/25 and 10.0.0.64/26 relate to each other?
They are adjacent and do not overlap.
They overlap only at 10.0.0.64.
The /25 range is entirely contained within the /26 range.
The /26 range is entirely contained within the /25 range.
3. Under traditional IPv4 subnetting rules, how many usable host addresses does a /27 subnet provide?
32
28
30
14
4. A device has the address 192.168.1.70/26. What is its network address?
192.168.1.64
192.168.1.0
192.168.1.70
192.168.1.128
5. Which single CIDR block exactly summarizes the adjacent networks 192.168.0.0/24 and 192.168.1.0/24?
192.168.0.0/22
192.168.0.0/23
192.168.1.0/23
192.168.0.0/25
6. You must split 10.20.0.0/16 into at least 12 equal-size subnets. What is the smallest new prefix that provides enough subnets?
/18
/20
/21
/19
7. Which statement correctly describes 172.16.8.14/24 and 172.16.8.200/24?
They are in the same subnet, whose network address is 172.16.8.0.
They are in different subnets because their final octets differ.
They are in different subnets: 172.16.8.0 and 172.16.8.128.
They are in the same subnet, whose network address is 172.16.0.0.
8. Which address is a valid host address in 192.0.2.64/27?
192.0.2.64
192.0.2.95
192.0.2.94
192.0.2.96
9. Which subnet mask corresponds to a /20 prefix?
255.255.224.0
255.255.240.0
255.255.248.0
255.255.255.240
10. You need one subnet for at least 50 devices, using traditional network and broadcast reservations. What is the smallest suitable subnet?
/25
/26
/30
/27
11. What role does 203.0.113.159 play in the subnet 203.0.113.144/28?
It is a valid host address.
It is the network address.
It is outside the subnet.
It is the broadcast address.
12. What is the block-size increment in the final octet for /28 subnets?
28
8
16
32
13. What is the broadcast address for the subnet containing 10.0.5.130/25?
10.0.5.127
10.0.6.255
10.0.5.254
10.0.5.255
14. A 192.168.10.0/24 network is divided into four equal-size subnets. What prefix will each new subnet use?
/26
/25
/27
/28
15. How many total IPv4 addresses are contained in a /26 subnet?
128
62
32
64
16. What wildcard mask corresponds to a /27 subnet mask?
0.0.0.31
0.0.0.27
0.0.0.63
0.0.0.224