An architecture is being designed to support an Amazon WorkSpaces deployment of 1,000 desktops. Which architecture will support this deployment while allowing for future expansion?

The correct answer is D. A VPC with a /20 CIDR and two /23 subnets. B works because you will immediately have provision of 2x /21 subnets with 2,048 addresses in each, but that's all /20 addresses consumed so no more growth other than for WorkSpaces. D is the better answer because this immediately provides 1,024 IP addresses for WorkSpaces…

Submitted by jakub_pl· Mar 6, 2026Network Design

Question

Options

AA VPC with a /16 CIDR and one /21 subnet
BA VPC with a /20 CIDR and two /21 subnets
CA VPC with a /16 CIDR and one /22 subnet
DA VPC with a /20 CIDR and two /23 subnets

How the community answered

(39 responses)

A
8% (3)
B
5% (2)
C
18% (7)
D
69% (27)

Explanation

B works because you will immediately have provision of 2x /21 subnets with 2,048 addresses in each, but that's all /20 addresses consumed so no more growth other than for WorkSpaces. D is the better answer because this immediately provides 1,024 IP addresses for WorkSpaces (minus the usual) so works from day 1 with additional CIDR space available for allocation to WorkSpaces and/or other services within the VPC as it grows.

Topics

#Amazon WorkSpaces#VPC sizing#Subnetting#Network scaling

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