- A
Use an Application Load Balancer with sticky sessions enabled, and store sessions on each EC2 instance.
Why wrong: Incorrect. Storing sessions on each EC2 instance lacks a shared session store, so if an instance fails, sessions are lost. This does not provide high availability.
- B
Use a Classic Load Balancer with sticky sessions and store sessions in RDS.
Why wrong: Incorrect. A Classic Load Balancer supports sticky sessions but lacks advanced features. Storing sessions in RDS can cause database bottlenecks and latency, not optimal for a distributed session store.
- C
Use an Application Load Balancer with sticky sessions and Amazon ElastiCache for session storage.
Correct. The Application Load Balancer provides sticky sessions. Amazon ElastiCache is a distributed in-memory cache ideal for a shared session store, supporting high availability and scalability.
- D
Use Amazon CloudFront with origin failover and store sessions in S3.
Why wrong: Incorrect. CloudFront is a content delivery network, not a load balancer. S3 is object storage with eventual consistency, not suitable for fast session storage.
PAS-C01 Sticky sessions Practice Question
This PAS-C01 practice question tests your understanding of migration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: sticky sessions. 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 migrating a multi-tier web application to AWS. The web tier uses sticky sessions. The application tier uses a shared session store. Which architecture ensures high availability and scalability?
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
Use an Application Load Balancer with sticky sessions and Amazon ElastiCache for session storage.
Option C is correct because an Application Load Balancer (ALB) supports sticky sessions, and Amazon ElastiCache provides a scalable, low-latency, distributed session store that is shared across instances, ensuring high availability and scalability. Option A is incorrect because storing sessions on each EC2 instance does not provide a shared session store; if an instance fails, its sessions are lost. Option B is incorrect because while the Classic Load Balancer supports sticky sessions and RDS can be used as a session store, RDS is not optimized for high-throughput session data and the Classic Load Balancer lacks advanced features like path-based routing and is considered legacy. Option D is incorrect because Amazon CloudFront is a content delivery network (CDN) and is not designed for session storage; S3 is object storage with higher latency, making it unsuitable for real-time session data.
Key principle: Sticky sessions
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use an Application Load Balancer with sticky sessions enabled, and store sessions on each EC2 instance.
Why it's wrong here
Incorrect. Storing sessions on each EC2 instance lacks a shared session store, so if an instance fails, sessions are lost. This does not provide high availability.
- ✗
Use a Classic Load Balancer with sticky sessions and store sessions in RDS.
Why it's wrong here
Incorrect. A Classic Load Balancer supports sticky sessions but lacks advanced features. Storing sessions in RDS can cause database bottlenecks and latency, not optimal for a distributed session store.
- ✓
Use an Application Load Balancer with sticky sessions and Amazon ElastiCache for session storage.
Why this is correct
Correct. The Application Load Balancer provides sticky sessions. Amazon ElastiCache is a distributed in-memory cache ideal for a shared session store, supporting high availability and scalability.
Related concept
Sticky sessions
- ✗
Use Amazon CloudFront with origin failover and store sessions in S3.
Why it's wrong here
Incorrect. CloudFront is a content delivery network, not a load balancer. S3 is object storage with eventual consistency, not suitable for fast session storage.
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.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Sticky sessions
- Shared session store
- Application Load Balancer (ALB)
- Amazon ElastiCache
TExam Day Tips
- 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
Sticky sessions
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
Review sticky sessions, then practise related PAS-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Migration — This question tests Migration — Sticky sessions.
What is the correct answer to this question?
The correct answer is: Use an Application Load Balancer with sticky sessions and Amazon ElastiCache for session storage. — Option C is correct because an Application Load Balancer (ALB) supports sticky sessions, and Amazon ElastiCache provides a scalable, low-latency, distributed session store that is shared across instances, ensuring high availability and scalability. Option A is incorrect because storing sessions on each EC2 instance does not provide a shared session store; if an instance fails, its sessions are lost. Option B is incorrect because while the Classic Load Balancer supports sticky sessions and RDS can be used as a session store, RDS is not optimized for high-throughput session data and the Classic Load Balancer lacks advanced features like path-based routing and is considered legacy. Option D is incorrect because Amazon CloudFront is a content delivery network (CDN) and is not designed for session storage; S3 is object storage with higher latency, making it unsuitable for real-time session data.
What should I do if I get this PAS-C01 question wrong?
Review sticky sessions, then practise related PAS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Sticky sessions
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Last reviewed: Jun 20, 2026
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