About This Domain
Domain 3 — Infrastructure Security — accounts for 20% of the SCS-C02 certification exam. This domain evaluates your understanding of design secure vpc architectures with segmentation and isolation, implement edge security (waf, shield, cloudfront, network firewall), configure secure connectivity (vpn, direct connect, privatelink), and related concepts. Design and implement secure network architectures, edge protection, and compute security on AWS. To pass this section you need practical knowledge of how these services and patterns work together in real-world architectures.
What You'll Be Tested On
- Design secure VPC architectures with segmentation and isolation
- Implement edge security (WAF, Shield, CloudFront, Network Firewall)
- Configure secure connectivity (VPN, Direct Connect, PrivateLink)
- Implement host-based security (Inspector, SSM Patch Manager)
- Design centralized network inspection architectures
Key AWS Services in This Domain
Study Strategy for Domain 3
While 20% might seem like a smaller portion of the exam, every point counts toward the passing score. Focus on understanding core concepts and common exam scenarios for this domain. Don't neglect it — even a few missed questions here can make the difference between pass and fail.
Exam Tips for Domain 3
Know defense-in-depth layers: edge → VPC → subnet → instance
Understand Network Firewall rule evaluation and inspection VPC patterns
Practice designing centralized egress filtering with TGW + Network Firewall
Frequently Asked Questions
How many questions on the SCS-C02 exam come from Domain 3?
Domain 3 (Infrastructure Security) makes up 20% of the SCS-C02 exam. The exam has 65 scored questions, so approximately 13 questions will come from this domain.
What services should I focus on for Domain 3?
The key services for this domain include VPC Security, Network Firewall, WAF & Shield, Certificate Manager. Make sure you understand how each service works, its use cases, and how they integrate with one another.
How should I prepare for Infrastructure Security questions?
Start by reviewing the key topics listed above, then practice with domain-specific questions. Focus on understanding real-world scenarios rather than memorizing facts. Use our practice quizzes to test your knowledge and review explanations for any questions you get wrong.
What's the best order to study the SCS-C02 domains?
Many candidates start with the highest-weighted domains first. For the SCS-C02 exam, the domains in order of weight are: Threat Detection & Incident Response (14%), Security Logging & Monitoring (18%), Infrastructure Security (20%), Identity & Access Management (16%), Data Protection (18%), Management & Security Governance (14%). However, start with whichever domain aligns best with your existing experience.
Practice Domain 3 Questions
Test your knowledge of Infrastructure Security with practice questions from our SCS-C02 question bank.
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