ISC Infrastructure And System Security Practice Question
A security architect is configuring an AWS VPC to ensure that traffic between two subnets is inspected by a centralized firewall appliance. Which configuration provides the most resilient design?
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
✓
Deploy a Gateway Load Balancer (GWLB) and use VPC Ingress Routing to route traffic through the fleet.
Using AWS Gateway Load Balancer (GWLB) with VPC Ingress Routing ensures that traffic is transparently intercepted and inspected by the firewall before reaching the destination, providing higher scalability than static routing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure static route tables on all subnets to point to the firewall's ENI.
Why it's wrong here
This is difficult to manage at scale and prone to configuration drift.
- ✗
Implement a transparent bridge on each EC2 instance in the destination subnet.
Why it's wrong here
This is not a scalable architectural design for VPC traffic management.
- ✗
Utilize AWS Transit Gateway with route tables that hairpin traffic to a security VPC.
Why it's wrong here
While possible, GWLB is specifically optimized for this traffic inspection use case.
- ✓
Deploy a Gateway Load Balancer (GWLB) and use VPC Ingress Routing to route traffic through the fleet.
Why this is correct
GWLB is the standard architectural pattern for centralized inspection in AWS.
Visual reference
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official (ISC)² exam blueprint
This ISC practice question is part of Courseiva's free (ISC)² 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 ISC exam.