100-150 Question 89
Select 4A network administrator is configuring a subnet for a company’s network using the IP address 192.168.10.0/24. They decide to divide the network into smaller subnets by using a /26 prefix. Which of the following IP ranges represent valid subnets with the /26 prefix?
- A
192.168.10.0 - 192.168.10.63
- B
192.168.10.64 - 192.168.10.127
- C
192.168.10.128 - 192.168.10.191
- D
192.168.10.192 - 192.168.10.255
- E
192.168.10.0 - 192.168.10.127
Show answer and explanation
Correct answers: A, B, C, D
Explanation
The /26 prefix means 26 bits are used for the network portion, leaving 6 bits for the host portion. This creates subnets with 2^6 = 64 IP addresses each. A /24 network can be divided into 4 subnets of /26, with the ranges: 192.168.10.0-63, 192.168.10.64-127, 192.168.10.128-191, and 192.168.10.192-255.
- A. Correct.
This is a valid subnet range for the /26 prefix (64 IPs, 0-63).
- B. Correct.
This is a valid subnet range for the /26 prefix (64 IPs, 64-127).
- C. Correct.
This is a valid subnet range for the /26 prefix (64 IPs, 128-191).
- D. Correct.
This is a valid subnet range for the /26 prefix (64 IPs, 192-255).
- E. Incorrect.
This is incorrect because the /26 prefix divides the /24 network into four smaller subnets, not two larger ones like a /25 prefix would.