Question 1,345 of 1,621
ANS-C01 Network Design Practice Question
A company is designing a network for a three-tier web application. The web tier must be accessible from the internet, while the application and database tiers must be in private subnets. The company wants to minimize the number of load balancers. Which design should be used?
⚠ Common exam trap
A common mix-up: candidates assume all internal tiers must be in private subnets and forget that the web tier itself must be in public subnets to receive traffic from the internet-facing ALB, or they mistakenly think an internal ALB can be made internet-facing via a NAT gateway.
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
✓
Place an internet-facing Application Load Balancer in a public subnet, web tier instances in public subnets, and app/database instances in private subnets.
An internet-facing Application Load Balancer (ALB) in a public subnet can receive internet traffic and forward it to web tier instances in public subnets, while the application and database tiers remain in private subnets with no direct internet access. This design uses a single load balancer to handle all external traffic, minimizing the number of load balancers while maintaining security boundaries.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Place an internal Application Load Balancer in a private subnet and use a NAT gateway for internet access.
Why it's wrong here
Internal ALB cannot receive internet traffic directly.
- ✗
Place an internet-facing Network Load Balancer in a public subnet and use it for all tiers.
Why it's wrong here
NLB does not support application-layer routing.
- ✓
Place an internet-facing Application Load Balancer in a public subnet, web tier instances in public subnets, and app/database instances in private subnets.
Why this is correct
Allows direct internet access to web tier; app tier remains private.
- ✗
Place an internet-facing Application Load Balancer in a private subnet.
Why it's wrong here
Internet-facing ALB must be in public subnets.
Visual reference
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Last reviewed: Jun 24, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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