CV0-003 · Question #510
An organization will be deploying a web application in a public cloud with two web servers, two database servers, and a load balancer that is accessible over a single public IP. Taking into account th
The correct answer is C. 192.168.1.0/28. A /28 subnet is the smallest subnet that provides enough usable IP addresses for all current and planned hosts including the gateway.
Question
An organization will be deploying a web application in a public cloud with two web servers, two database servers, and a load balancer that is accessible over a single public IP. Taking into account the gateway for this subnet and the potential to add two more web servers, which of the following will meet the minimum IP requirement?
Options
- A192.168.1.0/26
- B192.168.1.0/27
- C192.168.1.0/28
- D192.168.1.0/29
How the community answered
(47 responses)- A11% (5)
- B19% (9)
- C66% (31)
- D4% (2)
Why each option
A /28 subnet is the smallest subnet that provides enough usable IP addresses for all current and planned hosts including the gateway.
A /26 subnet provides 62 usable host addresses, which far exceeds the 8-host minimum and is not the minimum subnet size that meets the requirement.
A /27 subnet provides 30 usable host addresses, which also exceeds the 8-host minimum and is not the smallest subnet that satisfies the requirement.
The deployment requires 2 web servers + 2 database servers + 1 load balancer + 1 subnet gateway + 2 future web servers = 8 host IP addresses. A /28 subnet contains 16 total addresses yielding 14 usable host addresses after subtracting the network and broadcast addresses, which is the smallest block that satisfies the 8-host minimum. The next smaller option, a /29, provides only 6 usable addresses, which is insufficient.
A /29 subnet provides only 6 usable host addresses (8 total minus network and broadcast), which is insufficient for the 8 host addresses required when including the gateway and planned expansion.
Concept tested: Subnetting minimum IP requirements for cloud network design
Source: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq
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