The answer is the flow hash algorithm used by Classic Load Balancers, which can cause uneven traffic distribution for SAP systems with many long-lived connections. This algorithm hashes connection attributes like source IP, port, and protocol to consistently route packets from the same session to the same target, but it does not account for connection duration or request count, so a few long-lived SAP web dispatcher connections can dominate while others remain idle. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding that Classic Load Balancers lack the per-request round-robin logic of modern Application Load Balancers, making them unsuitable for SAP’s sticky, persistent sessions. A common trap is confusing uneven distribution with health check failures or cross-zone settings, but the core issue is the hash algorithm’s behavior with long-lived flows. Memory tip: think “hash sticks, round-robin splits” to recall that flow hashing prioritizes session stickiness over balance.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
An SAP system is running on EC2 and uses a Classic Load Balancer to distribute traffic to web dispatchers. The operations team notices that the load balancer is not distributing traffic evenly. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The load balancer uses a flow hash algorithm that may not evenly distribute requests with many long-lived connections.
Option D is correct because Classic Load Balancer uses a flow hash algorithm that may cause uneven distribution with long-lived connections. Option A is wrong because health checks don't affect distribution balance. Option B is wrong because cross-zone load balancing helps but does not guarantee even distribution. Option C is wrong because connection draining does not affect distribution.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Cross-zone load balancing is disabled.
Why it's wrong here
Disabling cross-zone can cause uneven distribution across zones, but not the primary cause.
✗
Connection draining is not enabled.
Why it's wrong here
Connection draining affects in-flight requests during deregistration.
✓
The load balancer uses a flow hash algorithm that may not evenly distribute requests with many long-lived connections.
Why this is correct
Classic Load Balancer's flow hash can lead to uneven distribution for persistent connections.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The health check interval is set too high.
Why it's wrong here
Health checks only affect routing to healthy instances.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
Technology — This question tests Technology — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The load balancer uses a flow hash algorithm that may not evenly distribute requests with many long-lived connections. — Option D is correct because Classic Load Balancer uses a flow hash algorithm that may cause uneven distribution with long-lived connections. Option A is wrong because health checks don't affect distribution balance. Option B is wrong because cross-zone load balancing helps but does not guarantee even distribution. Option C is wrong because connection draining does not affect distribution.
What should I do if I get this PAS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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