ANS-C01 Network Implementation Practice Question
Which THREE of the following are considerations when designing a VPC with multiple Availability Zones for high availability? (Choose THREE.)
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that a single subnet can span multiple Availability Zones, but AWS strictly requires each subnet to be confined to one AZ, and candidates may also incorrectly assume that a single NAT gateway is sufficient for high availability if they overlook the single point of failure risk.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an Application Load Balancer to distribute traffic across instances in different Availability Zones.
An Application Load Balancer (ALB) distributes incoming traffic across multiple targets, such as EC2 instances, in different Availability Zones (AZs). By registering instances from multiple AZs with the ALB, you ensure that if one AZ becomes unavailable, the ALB can route traffic to healthy instances in another AZ, thereby maintaining high availability. This aligns with the AWS Well-Architected Framework's recommendation to deploy workloads across multiple AZs and use a load balancer to handle failover.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use an Application Load Balancer to distribute traffic across instances in different Availability Zones.
Why this is correct
ALB can route traffic to multiple AZs.
- ✗
Create a single public subnet that spans all Availability Zones.
Why it's wrong here
Subnets cannot span AZs; each subnet is in one AZ.
- ✓
Deploy NAT gateways in each Availability Zone for redundancy.
Why this is correct
Provides high availability for outbound internet access.
- ✓
Create separate subnets in each Availability Zone for the application tier.
Why this is correct
Spreading resources across AZs ensures availability.
- ✗
Use a single NAT gateway in one Availability Zone to reduce cost.
Why it's wrong here
This creates a single point of failure.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.