PAS-C01 Operations and Maintenance Practice Question
A company is migrating a legacy application to AWS. The application requires a static IP address that does not change during instance stop/start. The application also needs to be highly available across two Availability Zones. Which THREE actions should the company take to meet these requirements?
⚠ Common exam trap
Watch out — candidates often confuse the static IP capability of a Network Load Balancer with the DNS-based routing of an Application Load Balancer, or mistakenly think that a single Elastic IP on an instance provides high availability 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
✓
Use a Network Load Balancer with an Elastic IP address
A Network Load Balancer (NLB) supports static IP addresses by allowing you to associate an Elastic IP address with each of its Availability Zone subnets. This provides a fixed entry point that does not change when backend instances are stopped or started, meeting the requirement for a static IP. Combined with an Auto Scaling group spanning two Availability Zones, the NLB ensures high availability by distributing traffic across healthy instances in both 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.
- ✓
Use a Network Load Balancer with an Elastic IP address
Why this is correct
NLB supports static IP via EIP and is highly available across AZs.
- ✓
Allocate an Elastic IP address and associate it with the primary instance
Why this is correct
EIP provides a static public IP that can be remapped.
- ✗
Place the instances in a placement group to ensure high availability
Why it's wrong here
Placement groups are for low latency, not high availability across AZs.
- ✓
Configure an Auto Scaling group across two Availability Zones
Why this is correct
Auto Scaling across AZs provides high availability.
- ✗
Use an Application Load Balancer to distribute traffic to the instances
Why it's wrong here
ALB does not provide a static IP; it uses a DNS name.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-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 PAS-C01 exam.