🔄 Multi-Area OSPF - ENCOR Practice Questions

Deep dive into multi-area OSPF: area types (stub, NSSA, totally stubby), LSA types, virtual links, route summarization, and OSPF path selection in enterprise networks.

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ENCOR OSPF Advanced Question Bank (5 Questions)

Browse all 5 practice questions covering Multi-Area OSPF for the ENCOR certification exam. Each question includes the full answer and a detailed explanation to help you understand the concepts.

  1. Question 1Infrastructure

    What type of LSAs are blocked from entering an OSPF totally stubby area?

    AType 1 and Type 2 only
    BType 3, Type 4, and Type 5✓
    CAll LSA types
    DType 5 only
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    A totally stubby area blocks Type 3 (inter-area), Type 4 (ASBR summary), and Type 5 (external) LSAs. Only a default Type 3 LSA is injected by the ABR.

  2. Question 2Infrastructure

    Which OSPF LSA type describes external routes redistributed into OSPF?

    AType 1 (Router LSA)
    BType 3 (Summary LSA)
    CType 5 (External LSA)✓
    DType 7 (NSSA External LSA)
    Show Answer & Explanation
    Correct Answer: C
    Explanation:

    Type 5 LSAs are generated by ASBRs for external routes. Type 7 LSAs carry external routes within NSSAs and are converted to Type 5 by the ABR.

  3. Question 3Infrastructure

    What do OSPF Type 3 LSAs represent?

    ARouter links within an area
    BSummary LSAs generated by ABRs advertising inter-area routes (networks from one area summarized into another area)✓
    CExternal routes from redistribution
    DASBR locations
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    OSPF LSA types: Type 1 (Router LSA — links within an area), Type 2 (Network LSA — DR on multi-access segments), Type 3 (Summary/Network LSA — ABR advertises inter-area routes), Type 4 (Summary/ASBR LSA — ABR advertises ASBR location), Type 5 (External LSA — ASBR redistributed routes), Type 7 (NSSA External).

  4. Question 4Infrastructure

    Which OSPF LSA type is generated by an ASBR and carries information about external routes redistributed into OSPF?

    AType 1 – Router LSA
    BType 3 – Summary LSA
    CType 5 – AS External LSA✓
    DType 7 – NSSA External LSA
    Show Answer & Explanation
    Correct Answer: C
    Explanation:

    Type 5 AS External LSAs are generated by ASBRs (Autonomous System Boundary Routers) and flooded throughout the entire OSPF domain (except stub/NSSA areas). They carry external routes redistributed into OSPF. Type 7 LSAs serve a similar purpose but are used within NSSA areas and are converted to Type 5 at the ABR.

  5. Question 5Infrastructure

    What traffic is filtered in an OSPF Totally Stubby Area?

    AOnly external routes
    BBoth external routes (Type 5 LSAs) and inter-area routes (Type 3 LSAs) are blocked — only a default route is injected by the ABR✓
    CAll routes are blocked
    DNo routes are filtered
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    OSPF area types: Normal (all LSAs), Stub (blocks Type 5 external, injects default), Totally Stubby (blocks Type 3 inter-area + Type 5 external, only default route — simplest routing table), NSSA (allows local redistribution via Type 7 LSAs), Totally NSSA (blocks Type 3 + external, allows local Type 7).

Key OSPF Advanced Concepts for ENCOR

ospfmulti-areastubnssalsavirtual linksummarizationabrasbr

ENCOR OSPF Advanced Exam Tips

Multi-Area OSPF questions in ENCOR are typically scenario-based. Focus on service-level decision making aligned to official exam objectives. Priority concepts: ospf, multi-area, stub, nssa, lsa, virtual link.

What ENCOR Expects

  • Anchor your answer in select the most practical, secure, and scalable answer for the stated scenario.
  • OSPF Advanced scenarios for ENCOR are frequently mapped to Domain 3 (30%), so read the objective carefully before picking controls or architecture.
  • Expect multi-service scenarios where OSPF Advanced interacts with IAM, networking, storage, or observability patterns rather than appearing as an isolated service question.
  • When two options are both technically valid, prefer the choice that best aligns with the exam's operational scope (Professional) and managed-service best practices.

High-Value OSPF Advanced Concepts

  • Know the core OSPF Advanced building blocks cold: ospf, multi-area, stub, nssa.
  • Review the edge-case features and limits for lsa, virtual link; these details are commonly used to differentiate answer choices.
  • Practice service-integration reasoning: how OSPF Advanced pairs with Infrastructure, EIGRP, BGP in real deployment patterns.
  • For ENCOR, explain why the chosen OSPF Advanced design meets reliability, security, and cost expectations better than the alternatives.

Common ENCOR Traps

  • Watch for answers that partially solve the requirement but miss operational constraints.
  • Questions in Infrastructure often include distractors that look correct for OSPF Advanced but violate least-privilege, durability, or availability requirements.
  • Avoid picking options purely by feature name; validate data path, failure handling, and governance impact before answering.
  • If the prompt hints at automation or repeatability, eliminate manual-only operational answers first.

Fast Review Checklist

  • Can you compare at least two OSPF Advanced implementation paths and justify which one best fits the scenario?
  • Can you map the chosen answer back to Infrastructure (30%) outcomes for ENCOR?
  • Can you explain security and access boundaries for OSPF Advanced without relying on default-open assumptions?
  • Can you describe how OSPF Advanced integrates with Infrastructure and EIGRP during failure, scaling, and monitoring events?

Exam Domains Covering OSPF Advanced

Domain 3Infrastructure30%

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