SK0-003 · Question #473
An administrator needs a network that can support up to 800 hosts on the same subnet. Which of the following is the MINIMUM subnet mask that should be used?
The correct answer is C. 255.255.252.0. To support 800 hosts on a single subnet, a minimum of 10 host bits is required, which corresponds to a /22 subnet mask.
Question
An administrator needs a network that can support up to 800 hosts on the same subnet. Which of the following is the MINIMUM subnet mask that should be used?
Options
- A255.0.0.0
- B255.255.0.0
- C255.255.252.0
- D255.255.255.0
How the community answered
(18 responses)- A11% (2)
- B6% (1)
- C78% (14)
- D6% (1)
Why each option
To support 800 hosts on a single subnet, a minimum of 10 host bits is required, which corresponds to a /22 subnet mask.
A 255.0.0.0 subnet mask (/8) provides over 16 million host IP addresses, which is far more than required and not the minimum.
A 255.255.0.0 subnet mask (/16) provides over 65,000 host IP addresses, which is far more than required and not the minimum.
A subnet mask of 255.255.252.0 corresponds to a /22 CIDR block, which provides 10 host bits (32-22=10), allowing for 2^10 - 2 = 1022 usable IP addresses, meeting the requirement for 800 hosts. This is the smallest subnet mask among the options that can accommodate at least 800 hosts.
A 255.255.255.0 subnet mask (/24) provides only 254 usable host IP addresses, which is insufficient for 800 hosts.
Concept tested: Subnet mask calculation for host capacity
Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/ip-addressing/ipv4-subnet-basics
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