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Question 494 of 1,733

Operations and Maintenance →mediumMultiple ChoiceObjective-mapped

ALB Health Check Interval Too Short — SAP Web Dispatcher

This PAS-C01 practice question tests your understanding of operations and maintenance. 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 SAP on AWS and uses an Application Load Balancer (ALB) to distribute traffic to a fleet of EC2 instances running SAP Web Dispatcher. The ALB has a target group with health checks configured on port 8080. Recently, the operations team noticed that some instances are being deregistered due to health check failures. The instances are healthy and the Web Dispatcher is running. The health check response time is consistently below 2 seconds. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The health check interval is too short, causing the threshold to be exceeded.
The health check interval is too short, causing the threshold to be exceeded. When the interval is too short, the ALB sends health checks more frequently, and if the threshold is low, a temporary slow response can trigger a failure.
B
The security group for the instances blocks inbound traffic from the internet.
Why wrong: The security group for the instances blocks inbound traffic from the internet. This is incorrect because ALB health checks originate from the ALB's own IPs, not the internet. The security group must allow traffic from the ALB's subnet.
C
The instances are running out of memory.
Why wrong: The instances are running out of memory. This is unlikely because the health check response time is under 2 seconds, indicating the Web Dispatcher is responsive.
D
The health check path is incorrect.
Why wrong: The health check path is incorrect. If the path were incorrect, all health checks would fail consistently, not just some instances.

Full breakdown with real-world context →

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

✓

The health check interval is too short, causing the threshold to be exceeded.

Option A is correct because a health check interval that is too short can cause the threshold to be exceeded even though the instances are healthy. If the interval is set very low, the ALB may send health checks more frequently than the instance can respond, leading to occasional timeouts or failures that accumulate and cross the unhealthy threshold. Option B is incorrect because the ALB health checks originate from the ALB's own subnet IPs, not from the internet, so a security group blocking internet traffic would not affect health checks. Option C is incorrect because memory exhaustion would typically cause application-level failures, not health check failures on port 8080 if Web Dispatcher is still running. Option D is incorrect because an incorrect health check path would cause all health checks to fail consistently, not just some instances intermittently.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
The health check interval is too short, causing the threshold to be exceeded.
Why this is correct
The health check interval is too short, causing the threshold to be exceeded. When the interval is too short, the ALB sends health checks more frequently, and if the threshold is low, a temporary slow response can trigger a failure.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
✗
The security group for the instances blocks inbound traffic from the internet.
Why it's wrong here
The security group for the instances blocks inbound traffic from the internet. This is incorrect because ALB health checks originate from the ALB's own IPs, not the internet. The security group must allow traffic from the ALB's subnet.
✗
The instances are running out of memory.
Why it's wrong here
The instances are running out of memory. This is unlikely because the health check response time is under 2 seconds, indicating the Web Dispatcher is responsive.
✗
The health check path is incorrect.
Why it's wrong here
The health check path is incorrect. If the path were incorrect, all health checks would fail consistently, not just some instances.

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.

TExam Day Tips

Write the block size before choosing the subnet.
Check whether the question asks for hosts, subnets or a specific address range.
Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

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.

Visual reference

What to study next

Got this wrong? Here's your next step.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PAS-C01 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this PAS-C01 question test?

Operations and Maintenance — This question tests Operations and Maintenance — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: The health check interval is too short, causing the threshold to be exceeded. — Option A is correct because a health check interval that is too short can cause the threshold to be exceeded even though the instances are healthy. If the interval is set very low, the ALB may send health checks more frequently than the instance can respond, leading to occasional timeouts or failures that accumulate and cross the unhealthy threshold. Option B is incorrect because the ALB health checks originate from the ALB's own subnet IPs, not from the internet, so a security group blocking internet traffic would not affect health checks. Option C is incorrect because memory exhaustion would typically cause application-level failures, not health check failures on port 8080 if Web Dispatcher is still running. Option D is incorrect because an incorrect health check path would cause all health checks to fail consistently, not just some instances intermittently.

What should I do if I get this PAS-C01 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

CIDR notation defines the prefix length.

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