The answer is to configure the ALB to use subnets in at least two Availability Zones. This is correct because an Application Load Balancer is a regional service that distributes incoming traffic across healthy targets only in the subnets where it is explicitly deployed; if it is attached to a single subnet, all traffic is forced into one AZ, creating a bottleneck and a single point of failure, which directly causes slow load times and reduced reliability. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding that ALB high availability and performance depend on multi-AZ subnet configuration, not just on adding more EC2 instances. A common trap is assuming that adding more instances in the same AZ will solve performance issues, but the root cause is the ALB’s lack of cross-zone distribution. Remember the memory tip: “One subnet, one AZ, one problem—spread the load across zones to spread the load on users.”
SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company runs a web application on EC2 instances behind an Application Load Balancer (ALB) in a VPC. Users report slow load times. The SysOps team notices that all traffic goes to a single availability zone. Which action should be taken to improve performance and reliability?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the ALB to use subnets in at least two Availability Zones
The correct action is to configure the ALB to use subnets in at least two Availability Zones. An ALB is a regional service that requires subnets in multiple AZs to distribute incoming traffic across healthy targets in those zones. When all traffic goes to a single AZ, it indicates the ALB is only attached to one subnet, creating a single point of failure and limiting the pool of EC2 instances that can serve traffic, which directly causes slow load times and reduced reliability.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Configure the ALB to use subnets in at least two Availability Zones
Why this is correct
This ensures the ALB can route traffic to instances in multiple AZs, improving performance and fault tolerance.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add more EC2 instances in the same Availability Zone
Why it's wrong here
This does not address the single-AZ bottleneck and increases risk.
✗
Replace the ALB with a Network Load Balancer (NLB)
Why it's wrong here
An NLB also requires multiple AZ subnets for high availability; the root cause remains.
✗
Enable cross-zone load balancing on the ALB
Why it's wrong here
Cross-zone load balancing distributes traffic across instances in different AZs, but the ALB must be in multiple AZs first.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse cross-zone load balancing (which distributes traffic across instances within an AZ) with multi-AZ subnet configuration (which enables the ALB to route traffic to instances in different AZs), leading them to incorrectly select option D.
Detailed technical explanation
How to think about this question
An ALB operates at the application layer (Layer 7) and must be associated with subnets in at least two Availability Zones to meet high availability requirements. When the ALB is attached to only one subnet, it can only route traffic to targets in that single AZ, even if you register instances in other AZs—the ALB's node in that AZ is the only entry point. In contrast, cross-zone load balancing (enabled by default on ALBs) distributes traffic evenly across all registered instances within the same AZ, but it cannot overcome the limitation of a single-AZ subnet configuration.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Networking and Content Delivery — This question tests Networking and Content Delivery — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the ALB to use subnets in at least two Availability Zones — The correct action is to configure the ALB to use subnets in at least two Availability Zones. An ALB is a regional service that requires subnets in multiple AZs to distribute incoming traffic across healthy targets in those zones. When all traffic goes to a single AZ, it indicates the ALB is only attached to one subnet, creating a single point of failure and limiting the pool of EC2 instances that can serve traffic, which directly causes slow load times and reduced reliability.
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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