ANS-C01 Network Implementation Practice Question
A company has a VPC with multiple subnets spanning three Availability Zones. They have deployed an Application Load Balancer (ALB) in the VPC and need to ensure high availability and scalability for a web application. Which of the following are design considerations for implementing the ALB in this environment? (Choose THREE.)
⚠ Common exam trap
AWS often tests the misconception that subnets can span multiple Availability Zones or that VPC peering can directly integrate an ALB with subnets in another VPC, but both are architecturally invalid in AWS.
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
✓
Enable the ALB in at least two Availability Zones to provide high availability.
AWS requires an Application Load Balancer to be enabled in at least two Availability Zones to achieve high availability. If one AZ fails, the ALB can continue routing traffic to healthy targets in the remaining AZs, ensuring fault tolerance and compliance with the ALB's regional service model.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable the ALB in at least two Availability Zones to provide high availability.
Why this is correct
ALB must have targets in multiple AZs to be highly available.
- ✓
Remove an Availability Zone from the ALB if the targets in that AZ are unhealthy.
Why this is correct
This prevents routing traffic to unhealthy targets.
- ✗
Configure the ALB to use subnets that span multiple Availability Zones.
Why it's wrong here
Subnets are specific to one AZ; ALB must have one subnet per AZ.
- ✗
Use VPC peering to connect the ALB to subnets in other VPCs.
Why it's wrong here
ALB is regional and does not use VPC peering.
- ✓
Enable cross-zone load balancing to evenly distribute traffic across all targets.
Why this is correct
Cross-zone load balancing ensures even distribution.
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JA
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.