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Question 817 of 1,546

Reliability and Business Continuity →hardMultiple ChoiceObjective-mapped

SOA-C02 Reliability and Business Continuity Practice Question

This SOA-C02 practice question tests your understanding of reliability and business continuity. 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.

A company runs a stateful web application on EC2 instances in an Auto Scaling group across two Availability Zones. The application uses an Application Load Balancer for traffic distribution. Users report that their sessions are frequently lost during scale-in events. The SysOps administrator needs to minimize session loss without introducing significant latency. What should the administrator do?

Clue words in this question

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

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

Question 1hardmultiple choice

Full question →

A
Replace the Application Load Balancer with a Network Load Balancer. Enable proxy protocol v2 to pass client IP addresses.
Why wrong: A Network Load Balancer does not natively support sticky sessions based on cookies. This would break session persistence.
B
Enable sticky sessions (session affinity) on the ALB. Configure a lifecycle hook on the Auto Scaling group with a wait time equal to the ALB's connection draining timeout.
Sticky sessions route requests to the same instance; lifecycle hooks delay termination until draining completes, preserving sessions.
C
Increase the Auto Scaling group's cooldown period to 600 seconds. Configure the ALB to have a deregistration delay of 600 seconds.
Why wrong: This delays the termination but still does not ensure that subsequent requests are sent to the same instance. Sticky sessions are needed.
D
Configure the Auto Scaling group to scale based on memory utilization instead of CPU. Set the cooldown period to 300 seconds.
Why wrong: Changing the scaling metric does not solve session stickiness. Cooldown delays scaling but does not prevent session loss during scale-in.

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

✓

Enable sticky sessions (session affinity) on the ALB. Configure a lifecycle hook on the Auto Scaling group with a wait time equal to the ALB's connection draining timeout.

Option C is correct because using an ALB with sticky sessions (session affinity) and a connection draining timeout that matches the lifecycle hook's wait time ensures that in-flight requests complete before instance termination. Option A is wrong because scaling based on memory does not address session stickiness. Option B is wrong because a larger cooldown delay helps but does not ensure session persistence across instances. Option D is wrong because a Network Load Balancer does not support sticky sessions by cookie in the same way and is not ideal for HTTP traffic.

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.

✗
Replace the Application Load Balancer with a Network Load Balancer. Enable proxy protocol v2 to pass client IP addresses.
Why it's wrong here
A Network Load Balancer does not natively support sticky sessions based on cookies. This would break session persistence.
✓
Enable sticky sessions (session affinity) on the ALB. Configure a lifecycle hook on the Auto Scaling group with a wait time equal to the ALB's connection draining timeout.
Why this is correct
Sticky sessions route requests to the same instance; lifecycle hooks delay termination until draining completes, preserving sessions.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Increase the Auto Scaling group's cooldown period to 600 seconds. Configure the ALB to have a deregistration delay of 600 seconds.
Why it's wrong here
This delays the termination but still does not ensure that subsequent requests are sent to the same instance. Sticky sessions are needed.
✗
Configure the Auto Scaling group to scale based on memory utilization instead of CPU. Set the cooldown period to 300 seconds.
Why it's wrong here
Changing the scaling metric does not solve session stickiness. Cooldown delays scaling but does not prevent session loss during scale-in.

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

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.

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 SOA-C02 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Reliability and Business Continuity — This question tests Reliability and Business Continuity — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Enable sticky sessions (session affinity) on the ALB. Configure a lifecycle hook on the Auto Scaling group with a wait time equal to the ALB's connection draining timeout. — Option C is correct because using an ALB with sticky sessions (session affinity) and a connection draining timeout that matches the lifecycle hook's wait time ensures that in-flight requests complete before instance termination. Option A is wrong because scaling based on memory does not address session stickiness. Option B is wrong because a larger cooldown delay helps but does not ensure session persistence across instances. Option D is wrong because a Network Load Balancer does not support sticky sessions by cookie in the same way and is not ideal for HTTP traffic.

What should I do if I get this SOA-C02 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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