About This Domain
Domain 1 — Layer 3 Technologies — accounts for 35% of the ENARSI certification exam. This domain evaluates your understanding of eigrp: named mode, stub, authentication, summarization, ospf: multi-area, lsa filtering, summarization, virtual links, bgp: path manipulation, communities, route reflectors, confederations, and related concepts. Advanced EIGRP, OSPF, BGP, redistribution, PBR, and VRF-lite. 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
- EIGRP: named mode, stub, authentication, summarization
- OSPF: multi-area, LSA filtering, summarization, virtual links
- BGP: path manipulation, communities, route reflectors, confederations
- Route redistribution and loop prevention
- PBR and IP SLA tracking
Key Cisco Technologies in This Domain
Study Strategy for Domain 1
At 35% of the exam, this is the highest-weighted domain — invest proportionally more study time here. Focus on hands-on labs and scenario-based questions. Aim to answer at least 80% of Domain 1 questions correctly in practice tests before sitting the real exam.
Exam Tips for Domain 1
This is 35% of the exam. Focus on redistribution and BGP path manipulation.
Know route maps, prefix lists, and distribute lists for filtering.
Frequently Asked Questions
How many questions on the ENARSI exam come from Domain 1?
Domain 1 (Layer 3 Technologies) makes up 35% of the ENARSI exam. The exam has 65 scored questions, so approximately 23 questions will come from this domain.
What services should I focus on for Domain 1?
The key services for this domain include Layer 3 Technologies. Make sure you understand how each service works, its use cases, and how they integrate with one another.
How should I prepare for Layer 3 Technologies 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 1 Questions
Test your knowledge of Layer 3 Technologies with practice questions from our ENARSI question bank.
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