GSEC Defensible Network Architecture Practice Question
A security team is designing a resilient perimeter architecture to protect internal services from distributed denial of service attacks and web application exploits. Which THREE architectural components must be incorporated into this design? (Choose THREE)
⚠ Common exam trap
Candidates often include 'IDS/IPS' or 'VPN' as primary components, failing to prioritize the specific combination of WAF, DDoS scrubbing, and redundant firewalls for perimeter resilience.
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
✓
A dedicated web application firewall to inspect HTTP and HTTPS traffic for application-layer vulnerabilities and injection attacks.
A robust perimeter defense requires multiple layers of inspection and mitigation. Web application firewalls inspect application-layer HTTP and HTTPS traffic to block injection attacks, hardware DDoS mitigation scrubbing centers absorb volumetric network floods upstream, and redundant boundary firewalls enforce stateful perimeter access control policies while eliminating single points of failure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A dedicated web application firewall to inspect HTTP and HTTPS traffic for application-layer vulnerabilities and injection attacks.
Why this is correct
A web application firewall terminates and inspects HTTP and HTTPS at layer 7, blocking injection and other application-layer exploits that volumetric scrubbing cannot detect, satisfying the requirement to defend internal services against web application attacks.
- ✗
Unmanaged Layer-1 hubs placed directly outside the perimeter firewall to mirror raw traffic into analysis buffers.
Why it's wrong here
Unmanaged hubs cannot segment or filter traffic and introduce a single point of failure; they mirror raw frames rather than protect services. It is tempting because passive taps feed intrusion-detection analysis, but the design needs inline DDoS scrubbing, a WAF and stateful inspection instead.
- ✓
Upstream cloud or on-premise DDoS mitigation scrubbing centers to filter volumetric network layer flooding attacks.
Why this is correct
Upstream scrubbing centres divert traffic during volumetric floods, filtering network-layer attacks before they saturate the origin's internet link. This satisfies the resilience constraint by absorbing distributed denial of service traffic that on-premise edge devices alone cannot handle, preserving bandwidth for legitimate requests to the protected internal services.
- ✓
Dual redundant boundary firewalls configured in high-availability clusters to prevent single points of failure.
Why this is correct
Dual redundant boundary firewalls in high-availability clusters eliminate single points of failure at the network edge, ensuring inspection capacity survives a device outage. This directly satisfies the resilience constraint in the stem, since a lone firewall would itself become a single point of failure during a distributed denial of service attack.
- ✗
Disabling all stateful inspection engines on perimeter firewalls to maximize throughput for inbound HTTPS sessions.
Why it's wrong here
Disabling stateful inspection removes the control that filters malformed and exploit-bearing packets, directly undermining web application protection. It is tempting because stateful processing consumes resources during volumetric floods, but the design still requires inspection alongside DDoS scrubbing and a WAF.
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 September 2026 · checked against the official GIAC exam blueprint
This GSEC practice question is part of Courseiva's free GIAC 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 GSEC exam.