Question 999 of 1,621
ANS-C01 Network Design Practice Question
A company is designing a highly available architecture for a web application using an Application Load Balancer (ALB) in a VPC. They need to ensure that the application can handle a sudden increase in traffic and that the ALB can scale automatically. Which TWO actions should they take? (Choose two.)
⚠ Common exam trap
AWS often tests the misconception that enabling cross-zone load balancing is optional or unnecessary for high availability, when in fact it is a critical feature for distributing traffic evenly and supporting automatic scaling across zones.
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
✓
Configure the target group's deregistration delay to a low value to quickly remove unhealthy targets.
Configuring a low deregistration delay on the target group allows the ALB to quickly stop sending traffic to unhealthy targets, reducing the risk of failed requests during traffic spikes. This setting controls how long the ALB waits for in-flight requests to complete before deregistering a target, and a lower value accelerates the removal of unhealthy instances to maintain application responsiveness. Option D is correct because enabling cross-zone load balancing distributes incoming traffic evenly across all healthy targets in all Availability Zones, maximizing resource utilization and ensuring the ALB can scale automatically by leveraging capacity from multiple zones.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure the target group's deregistration delay to a low value to quickly remove unhealthy targets.
Why this is correct
A low deregistration delay ensures that unhealthy instances are removed quickly, preventing them from receiving traffic.
- ✗
Use a single subnet for the ALB to reduce complexity.
Why it's wrong here
Using a single subnet defeats high availability; the ALB should be in multiple subnets across AZs.
- ✗
Use a Network Load Balancer instead of an ALB to improve throughput.
Why it's wrong here
NLB does not support path-based routing, which is likely needed for the web application.
- ✓
Enable cross-zone load balancing on the ALB.
Why this is correct
Cross-zone load balancing distributes traffic evenly across all registered instances in all enabled Availability Zones.
- ✗
Disable deletion protection on the ALB to allow automatic replacement.
Why it's wrong here
Deletion protection prevents accidental deletion but does not affect scaling.
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Same concept, more angles
1 more way this is tested on ANS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is designing a highly available architecture for a web application using an Application Load Balancer (ALB) across multiple Availability Zones. The application requires that user sessions are maintained (sticky sessions) and that the ALB can offload SSL/TLS termination. Which configuration should they use?
medium- A.Create a Network Load Balancer with a target group that has stickiness enabled and an SSL listener.
- B.Launch EC2 instances as reverse proxy servers in front of the application servers, configure SSL on the reverse proxy, and use an Application Load Balancer to distribute traffic to the reverse proxies.
- C.Create a Classic Load Balancer with sticky sessions and SSL termination.
- ✓ D.Create an Application Load Balancer with a target group that has stickiness enabled and an HTTPS listener that terminates SSL.
Why D: An Application Load Balancer (ALB) natively supports both sticky sessions (via a generated cookie or application-based cookie) and SSL/TLS termination at the HTTPS listener. This allows the ALB to decrypt traffic before forwarding it to targets over HTTP, reducing backend processing overhead while maintaining session affinity across multiple Availability Zones for high availability.
Last reviewed: Jun 30, 2026
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