The correct choice is to enable sticky sessions on the Application Load Balancer using a load balancer-generated cookie, as this binds a user’s session to a specific target instance with minimal performance overhead. This works because the ALB inserts an AWSALB cookie into the client’s response, which the client then sends back on subsequent requests, allowing the load balancer to route traffic consistently to the same backend without requiring any application-level changes or external data stores. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this concept tests your understanding of session affinity configuration under the Elastic Load Balancing domain, and a common trap is confusing ALB sticky sessions with Network Load Balancer capabilities—NLB does not natively support cookie-based stickiness. Another frequent distractor is over-engineering the solution with DynamoDB or CloudFront, which add unnecessary latency or serve a different purpose. Memory tip: think “ALB cookie = stickiness without the sticky situation.”
SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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 is deploying a web application on EC2 instances behind an Application Load Balancer (ALB). The application needs to maintain user session state. Which configuration ensures session stickiness with minimal performance impact?
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 on the Application Load Balancer using a load balancer-generated cookie.
Option B is correct because ALB sticky sessions use a cookie to bind a user's session to a specific target, which is the simplest and most efficient method. Option A is incorrect because an NLB does not natively support sticky sessions with cookies. Option C is incorrect because DynamoDB would add latency and complexity. Option D is incorrect because CloudFront is for content delivery, not session stickiness.
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.
✗
Use Amazon CloudFront with origin stickiness enabled.
Why it's wrong here
CloudFront does not provide session stickiness; it caches content at edge locations.
✗
Use a Network Load Balancer (NLB) with target group stickiness.
Why it's wrong here
NLB does not natively support cookie-based stickiness; it relies on source IP which can be unreliable.
✓
Enable sticky sessions on the Application Load Balancer using a load balancer-generated cookie.
Why this is correct
ALB sticky sessions with a generated cookie are designed for this purpose and have minimal overhead.
Related concept
Static NAT maps one inside address to one outside address.
✗
Store session state in Amazon DynamoDB and have each instance read from DynamoDB.
Why it's wrong here
While this works, it adds latency and cost; ALB sticky sessions are more efficient.
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 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.
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.
Networking and Content Delivery — This question tests Networking and Content Delivery — 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 on the Application Load Balancer using a load balancer-generated cookie. — Option B is correct because ALB sticky sessions use a cookie to bind a user's session to a specific target, which is the simplest and most efficient method. Option A is incorrect because an NLB does not natively support sticky sessions with cookies. Option C is incorrect because DynamoDB would add latency and complexity. Option D is incorrect because CloudFront is for content delivery, not session stickiness.
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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