SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is running a web application on EC2 instances in an Auto Scaling group behind an Application Load Balancer. The application stores session data on the local instance storage. Users are experiencing session loss during scaling events. What should a SysOps administrator do to maintain session persistence?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Move session data to an ElastiCache for Redis cluster.
Option B is correct because using ElastiCache for session state allows instances to be terminated and replaced without losing session data. Option A is wrong because sticky sessions (session affinity) can cause uneven load and do not protect against instance failure. Option C is wrong because EBS volumes are not shared across instances. Option D is wrong because increasing instance size does not solve the session loss issue.
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.
✓
Move session data to an ElastiCache for Redis cluster.
Why this is correct
ElastiCache provides a centralized, durable session store that survives instance termination.
Related concept
Static NAT maps one inside address to one outside address.
✗
Increase the EC2 instance size to reduce the frequency of scaling events.
Why it's wrong here
Larger instances do not prevent scaling events and session data on local storage is still ephemeral.
✗
Attach an Amazon EBS volume to each instance and store session data there.
Why it's wrong here
EBS volumes are tied to specific instances and cannot be shared; sessions would still be lost if the instance fails.
✗
Enable sticky sessions on the Application Load Balancer.
Why it's wrong here
Sticky sessions only route requests to the same instance, but if the instance is terminated, the session is lost.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
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: Move session data to an ElastiCache for Redis cluster. — Option B is correct because using ElastiCache for session state allows instances to be terminated and replaced without losing session data. Option A is wrong because sticky sessions (session affinity) can cause uneven load and do not protect against instance failure. Option C is wrong because EBS volumes are not shared across instances. Option D is wrong because increasing instance size does not solve the session loss issue.
What should I do if I get this SOA-C02 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 SOA-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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