About This Domain
Domain 3 — Infrastructure Security — accounts for 20% of the ENARSI certification exam. This domain evaluates your understanding of copp and cpu protection, urpf (strict vs loose mode), routing protocol authentication (ospf, eigrp, bgp), and related concepts. Device hardening, CoPP, uRPF, AAA, and routing protocol authentication. 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
- CoPP and CPU protection
- uRPF (strict vs loose mode)
- Routing protocol authentication (OSPF, EIGRP, BGP)
- AAA with TACACS+ and RADIUS
- Management plane hardening (SSH, ACLs, login banners)
Key Cisco Technologies 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.
Exam Tips for Domain 3
uRPF strict mode drops packets if source IP is not in the routing table via that interface.
Frequently Asked Questions
How many questions on the ENARSI exam come from Domain 3?
Domain 3 (Infrastructure Security) makes up 20% of the ENARSI 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 Infrastructure Security. 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.
What's the best order to study the ENARSI domains?
Many candidates start with the highest-weighted domains first. For the ENARSI exam, the domains in order of weight are: Layer 3 Technologies (35%), VPN Technologies (20%), Infrastructure Security (20%), Infrastructure Services (25%).
Practice Domain 3 Questions
Test your knowledge of Infrastructure Security with practice questions from our ENARSI question bank.
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