AWS Certified SysOps Administrator – Associate (legacy) — Question 548

A SysOps Administrator has implemented a VPC network design with the following requirements:
✑ Two Availability Zones (AZs)
✑ Two private subnets
✑ Two public subnets
✑ One internet gateway
✑ One NAT gateway
What would potentially cause applications in the VPC to fail during an AZ outage?

Answer options

• A. A single virtual private gateway, because it can be associated with a single AZ only.
• B. A single internet gateway, because it is not redundant across both AZs.
• C. A single NAT gateway, because it is not redundant across both AZs.
• D. The default VPC route table, because it can be associated with a single AZ only.

Correct answer: D

Explanation

If the default VPC route table is restricted or misconfigured in its association to a single AZ, resources in the unaffected AZ may lose their routing paths during an outage. Properly managing route table associations across multiple Availability Zones is critical to preventing routing failures when one zone goes down. Other components like the internet gateway are inherently highly available and redundant across the region's AZs.