ANS-C01 Network Design Practice Question
A company is deploying a critical application across multiple Availability Zones (AZs) in a single AWS region. The application requires a highly available network layer that can automatically detect and reroute traffic away from failed endpoints. Which AWS service should be used to meet this requirement?
⚠ Common exam trap
Watch out — candidates often confuse the Layer 4 NLB with the Layer 7 ALB, or mistakenly think Global Accelerator provides the same automatic failover at the network layer, when in fact Global Accelerator is a traffic optimization service that requires a separate load balancer for endpoint health checking.
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
✓
Network Load Balancer (NLB)
A Network Load Balancer (NLB) operates at Layer 4 (TCP/UDP) and is designed to handle millions of requests per second with extremely low latency. It performs health checks on targets (e.g., EC2 instances) in each Availability Zone and automatically reroutes traffic away from unhealthy endpoints, providing the required high availability and automatic failover across AZs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Network Load Balancer (NLB)
Why this is correct
NLB provides high availability and automatic rerouting at Layer 4.
- ✗
AWS Global Accelerator
Why it's wrong here
Global Accelerator is for multi-region traffic management.
- ✗
Application Load Balancer (ALB)
Why it's wrong here
ALB is Layer 7 and not necessary for network-layer requirements.
- ✗
NAT gateway
Why it's wrong here
NAT gateway does not provide load balancing.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.