ANS-C01 Network Implementation Practice Question
A company has a VPC with multiple subnets across three Availability Zones. They are deploying an NFS file system using Amazon EFS. They need high availability and low latency from all subnets. Which EFS deployment option meets these requirements?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that creating mount targets in every AZ alone guarantees high availability, but the storage class must also be Multi-AZ (Standard) to replicate data across AZs; otherwise, a single-AZ failure can cause data loss.
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 EFS Standard storage class with Multi-AZ and create mount targets in each Availability Zone.
The EFS Standard storage class provides Multi-AZ durability and availability, and creating mount targets in each Availability Zone ensures that EC2 instances in any subnet can connect to EFS with low latency by using a mount target in the same AZ. This architecture avoids cross-AZ data transfer charges and minimizes latency, meeting both high availability and low latency requirements.
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 EFS One Zone storage class with a single mount target in the same Availability Zone as the application.
Why it's wrong here
One Zone and single mount target provide no HA and limited latency.
- ✗
Use EFS Standard storage class with Multi-AZ and create a single mount target in one Availability Zone.
Why it's wrong here
Single mount target creates a single point of failure.
- ✓
Use EFS Standard storage class with Multi-AZ and create mount targets in each Availability Zone.
Why this is correct
Standard storage is replicated across AZs; mount targets in each AZ provide low latency.
- ✗
Use EFS One Zone storage class and create mount targets in each Availability Zone.
Why it's wrong here
One Zone storage is not highly available.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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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.