ANS-C01 Network Management and Operations Practice Question
A company is deploying a new application across multiple Availability Zones in a single region. The application requires low-latency communication between instances in different AZs. Which TWO design choices help achieve high availability and low latency? (Select TWO.)
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
✓
Launch EC2 instances in at least two Availability Zones.
To achieve high availability and low-latency communication between instances in different Availability Zones, you should launch instances in at least two AZs (C) to avoid a single point of failure, and use an Application Load Balancer (E) to distribute traffic and perform health checks. A spread placement group (A) is not recommended for low latency; it spreads instances across distinct hardware, which can increase latency. Larger instance sizes (B) only increase capacity and do not improve availability or latency. A single NAT Gateway (D) introduces a single point of failure and does not affect inter-AZ latency.
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 a spread placement group for the instances.
Why it's wrong here
Incorrect. A spread placement group spreads instances across distinct hardware, reducing correlated failures but increasing latency. For low-latency communication, use a cluster placement group.
- ✗
Use larger instance sizes to handle traffic spikes.
Why it's wrong here
Incorrect. Larger instance sizes increase capacity but do not inherently improve availability or reduce latency between AZs.
- ✓
Launch EC2 instances in at least two Availability Zones.
Why this is correct
Correct. Launching instances in at least two AZs eliminates a single point of failure and keeps traffic within the region, supporting both high availability and low latency.
- ✗
Use a single NAT Gateway to provide internet access.
Why it's wrong here
Incorrect. A single NAT Gateway is a single point of failure and does not affect low-latency communication between instances.
- ✓
Use an Application Load Balancer to distribute traffic across AZs.
Why this is correct
Correct. An Application Load Balancer distributes traffic across AZs and performs health checks, improving availability and maintaining low-latency traffic distribution.
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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.