100-150 Question 79
Single answerYou are tasked with subnetting the IP address 192.168.10.0/24 into smaller subnets to support four networks, each capable of hosting up to 50 devices. Which subnet mask should you use, and what would be the broadcast address of the second subnet?
- A
Subnet mask: 255.255.255.192; Broadcast address: 192.168.10.63
- B
Subnet mask: 255.255.255.224; Broadcast address: 192.168.10.95
- C
Subnet mask: 255.255.255.192; Broadcast address: 192.168.10.127
- D
Subnet mask: 255.255.255.240; Broadcast address: 192.168.10.79
Show answer and explanation
Correct answer: C
Explanation
To support four subnets with at least 50 devices each, a /26 subnet mask (255.255.255.192) is required, as it provides 64 total addresses per subnet (62 usable). The second subnet starts at 192.168.10.64 and ends at 192.168.10.127, making 192.168.10.127 the broadcast address. Only option 3 correctly identifies the subnet mask and broadcast address for this scenario.
- A. Incorrect.
This option uses a /26 (255.255.255.192) subnet mask, which creates subnets with 64 addresses each (62 usable). While this is the correct subnet mask, the broadcast address listed is for the first subnet, not the second.
- B. Incorrect.
This option uses a /27 (255.255.255.224) subnet mask, which creates subnets with 32 addresses each (30 usable). This does not meet the requirement of supporting 50 devices per subnet.
- C. Correct.
This option correctly uses a /26 (255.255.255.192) subnet mask, creating subnets with 64 addresses each (62 usable). The broadcast address of the second subnet is correctly calculated as 192.168.10.127.
- D. Incorrect.
This option uses a /28 (255.255.255.240) subnet mask, which creates subnets with 16 addresses each (14 usable). This does not meet the requirement of supporting 50 devices per subnet, and the broadcast address is incorrect for the scenario.