How Many Subnets for VPC Network Topology Supporting Internet-Facing and Intranet Applications Accessed over VPN?
Question
You have been asked to create a VPC network topology for your company.
The VPC network must support both internet-facing and intranet applications, accessed only over VPN.
Both internet-facing and intranet applications must be able to leverage at least 3 AZs each for high availability.
How many subnets must you create within your VPC to accommodate these requirements?
Answers
Explanations
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A. B. C. D.Correct Answer - D.
Since each subnet corresponds to one Availability Zone and you need 3 AZs for both the internet and intranet applications, you will need 6 subnets.
For internet-facing and intranet applications, they should be put at different subnets.
For more information on VPC and subnets, please visit the below URL:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.htmlTo accommodate both internet-facing and intranet applications and support high availability, the VPC network should have multiple subnets distributed across multiple Availability Zones (AZs).
To calculate the number of subnets required, we need to consider the following points:
- Both internet-facing and intranet applications are accessed only over VPN.
- Each of the internet-facing and intranet applications should be able to leverage at least 3 AZs for high availability.
To support both types of applications, we need to create subnets for each type of application separately. Each subnet should span across at least 3 AZs for high availability.
Considering the above points, we need to create:
- 3 subnets for the internet-facing application (1 subnet per AZ)
- 3 subnets for the intranet application (1 subnet per AZ)
Therefore, we need a total of 6 subnets for the VPC network topology to accommodate the given requirements.
So the correct answer is (D) 6.
