About This Domain
Domain 3 — Infrastructure — accounts for 30% of the ENCOR certification exam. This domain evaluates your understanding of multi-area ospf: area types, lsa types, summarization, eigrp: dual, named mode, load balancing, bgp path selection and route filtering, and related concepts. Layer 2 and Layer 3 infrastructure is the highest-weighted domain. Covers OSPF, EIGRP, BGP, STP, and multicast. 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
- Multi-area OSPF: area types, LSA types, summarization
- EIGRP: DUAL, named mode, load balancing
- BGP path selection and route filtering
- STP, RSTP, MST, EtherChannel
- FHRP: HSRP, VRRP, GLBP
- IP Multicast: IGMP, PIM sparse/dense
Key Cisco Technologies in This Domain
Study Strategy for Domain 3
At 30% 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 3 questions correctly in practice tests before sitting the real exam.
Exam Tips for Domain 3
This domain is 30% of the exam — allocate the most study time here.
Know OSPF LSA types 1 (router), 2 (network), 3 (summary), 5 (external), 7 (NSSA).
EIGRP variance command enables unequal-cost load balancing.
Frequently Asked Questions
How many questions on the ENCOR exam come from Domain 3?
Domain 3 (Infrastructure) makes up 30% of the ENCOR exam. The exam has 65 scored questions, so approximately 20 questions will come from this domain.
What services should I focus on for Domain 3?
The key services for this domain include Infrastructure, OSPF Advanced, EIGRP, BGP, Multicast. Make sure you understand how each service works, its use cases, and how they integrate with one another.
How should I prepare for Infrastructure 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 ENCOR domains?
Many candidates start with the highest-weighted domains first. For the ENCOR exam, the domains in order of weight are: Architecture (15%), Virtualization (10%), Infrastructure (30%), Network Assurance (10%), Security (20%), Automation (15%).
Practice Domain 3 Questions
Test your knowledge of Infrastructure with practice questions from our ENCOR question bank.
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