Question 899 of 1,621
ANS-C01 Network Security, Compliance and Governance Practice Question
A security engineer needs to block traffic from a specific country from reaching an Application Load Balancer. Which AWS service should be used to accomplish this?
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
✓
AWS WAF web ACL associated with the ALB
AWS WAF can be associated with an Application Load Balancer to create web ACLs with geographic match conditions, enabling geo-blocking. Option A (Network ACLs) is incorrect because NACLs operate at the subnet level and do not support geo-blocking. Option B (Security groups) is incorrect because security groups do not support geo-blocking. Option C (Route 53 Resolver DNS Firewall) is incorrect because it filters DNS queries, not HTTP traffic. Option D (AWS WAF web ACL associated with the ALB) is correct because WAF supports geographic match conditions to block traffic from specific countries.
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 ACLs on the VPC subnet
Why it's wrong here
NACLs do not support geo-blocking.
- ✗
Security groups associated with the ALB
Why it's wrong here
Security groups do not support geo-blocking.
- ✗
Route 53 Resolver DNS Firewall
Why it's wrong here
DNS Firewall filters DNS queries, not HTTP traffic.
- ✓
AWS WAF web ACL associated with the ALB
Why this is correct
AWS WAF supports geo-match conditions to block traffic from specific countries.
Visual reference
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Last reviewed: Jun 20, 2026
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.
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