ANS-C01 Network Security, Compliance and Governance Practice Question
A company wants to block outbound traffic from a VPC to the internet except through a NAT Gateway for updates to specific software repositories. Which AWS service should be used to control outbound traffic?
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 ACLs
Network ACLs can be attached to subnets to control inbound and outbound traffic at the subnet level, and can be used to block outbound internet traffic except through the NAT Gateway. Option A is wrong because Security Groups are stateful and cannot block outbound traffic based on destination IP ranges in a granular manner. Option B is wrong because Route Tables control routing, not filtering. Option C is wrong because VPC Endpoints are for private connectivity to AWS services, not for controlling outbound internet traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Security Groups
Why it's wrong here
Security Groups are stateful and cannot block outbound traffic to specific IP ranges easily.
- ✗
Route Tables
Why it's wrong here
Route tables control traffic routing, not filtering.
- ✗
VPC Endpoints
Why it's wrong here
VPC endpoints provide private connectivity to AWS services, not outbound internet filtering.
- ✓
Network ACLs
Why this is correct
Network ACLs are stateless and can control outbound traffic at the subnet level.
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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.