The answer is SurgeQueueLength and SpilloverCount. These two metrics directly reveal when an Application Load Balancer is overwhelmed because SurgeQueueLength tracks the number of requests waiting in the ALB’s internal queue, while SpilloverCount records requests that were rejected when the queue reached its maximum capacity. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your ability to distinguish between ALB-level bottlenecks and backend or network-level issues—a common trap is confusing backend health metrics like HealthyHostCount or latency metrics like TargetResponseTime with ALB capacity indicators. The key insight is that a growing queue or rising spillover count signals that the ALB itself, not the targets, is the bottleneck. For a quick memory tip, think “queue and spill” to recall that when the ALB’s queue fills up, requests spill over and get dropped.
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 has deployed a web application using an Application Load Balancer (ALB) in front of EC2 instances in an Auto Scaling group. The application experiences intermittent high latency. The network team suspects that the ALB is being overwhelmed by traffic. Which metrics should be analyzed in Amazon CloudWatch to determine if the ALB is the bottleneck?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
SurgeQueueLength and SpilloverCount
Option B is correct because SurgeQueueLength and SpilloverCount indicate when the ALB is unable to handle incoming requests. SurgeQueueLength shows the number of requests queued, and SpilloverCount shows requests that were rejected. Option A is wrong because RequestCount and TargetResponseTime do not directly show ALB capacity issues. Option C is wrong because HealthyHostCount and UnhealthyHostCount indicate backend health, not ALB load. Option D is wrong because ActiveConnectionCount and NewConnectionCount are normal metrics.
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.
✗
ActiveConnectionCount and NewConnectionCount
Why it's wrong here
These show connection counts but do not indicate if the ALB is overwhelmed.
✓
SurgeQueueLength and SpilloverCount
Why this is correct
SurgeQueueLength shows pending requests, and SpilloverCount shows dropped requests when the ALB is overloaded.
Related concept
Read the scenario before looking for a memorised answer.
✗
RequestCount and TargetResponseTime
Why it's wrong here
These metrics indicate the number of requests and backend response times, not whether the ALB is overwhelmed.
✗
HealthyHostCount and UnhealthyHostCount
Why it's wrong here
These indicate the health of target instances, not the ALB's capacity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
These show connection counts but do not indicate if the ALB is overwhelmed.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: SurgeQueueLength and SpilloverCount — Option B is correct because SurgeQueueLength and SpilloverCount indicate when the ALB is unable to handle incoming requests. SurgeQueueLength shows the number of requests queued, and SpilloverCount shows requests that were rejected. Option A is wrong because RequestCount and TargetResponseTime do not directly show ALB capacity issues. Option C is wrong because HealthyHostCount and UnhealthyHostCount indicate backend health, not ALB load. Option D is wrong because ActiveConnectionCount and NewConnectionCount are normal metrics.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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