🛣️ Advanced Layer 3 Technologies - ENARSI Practice Questions

Master EIGRP, OSPF, and BGP advanced features including redistribution, path control, route maps, prefix lists, and policy-based routing.

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1Exam Domains

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ENARSI Layer 3 Technologies Question Bank (5 Questions)

Browse all 5 practice questions covering Advanced Layer 3 Technologies for the ENARSI certification exam. Each question includes the full answer and a detailed explanation to help you understand the concepts.

  1. Question 1Layer 3 Technologies

    What advantage do prefix lists have over ACLs for BGP route filtering?

    APrefix lists support wildcard masks
    BPrefix lists can match both network address AND prefix length (ge/le), and are processed more efficiently✓
    CPrefix lists work with all routing protocols
    DPrefix lists support time-based filtering
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    Prefix lists match on both network address and prefix length using ge (greater than or equal) and le (less than or equal) keywords. They are stored in a trie structure for faster lookup than ACLs, making them more efficient for BGP filtering.

  2. Question 2Layer 3 Technologies

    How do route maps function in route redistribution?

    AThey only filter traffic
    BThey match routes using criteria (ACL, prefix list, tag) and apply actions (set metric, community, tag, next-hop) during redistribution✓
    CThey replace routing protocols
    DThey only work with static routes
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    Route maps contain ordered permit/deny clauses with match conditions (prefix, tag, metric) and set actions (modify metric, add community, set tag). In redistribution, they filter and manipulate routes being injected into the target protocol.

  3. Question 3Layer 3 Technologies

    Which redistribution command injects connected subnets into OSPF from another routing protocol?

    Aredistribute connected subnets✓
    Bnetwork command
    Cpassive-interface
    Ddistribute-list
    Show Answer & Explanation
    Correct Answer: A
    Explanation:

    'redistribute connected subnets' injects directly connected networks into OSPF as external routes (Type 5 LSAs by default), including subnet mask information with the 'subnets' keyword.

  4. Question 4Layer 3 Technologies

    In a route map used for BGP policy, what is the default action for entries that don't match any explicit clause?

    APermit
    BDeny (implicit)✓
    CForward to next route-map
    DLog and drop
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    Route maps have an implicit deny at the end (similar to ACLs). Any routes not matching an explicit permit or deny clause are denied by default.

  5. Question 5Layer 3 Technologies

    If a router learns the same prefix via OSPF (AD 110) and EIGRP (AD 90), which route is installed in the routing table?

    AOSPF — lower metric
    BEIGRP — lower administrative distance is preferred✓
    CBoth routes are installed with load balancing
    DNeither — the router drops both
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    When multiple routing protocols learn the same prefix, the route with the lowest Administrative Distance (AD) is installed. EIGRP (AD 90) beats OSPF (AD 110). AD is the trustworthiness rating: Connected=0, Static=1, EIGRP=90, OSPF=110, RIP=120, eBGP=20, iBGP=200.

Key Layer 3 Technologies Concepts for ENARSI

eigrpospfbgpredistributionroute mapprefix listpbrpath control

ENARSI Layer 3 Technologies Exam Tips

Advanced Layer 3 Technologies questions in ENARSI are typically scenario-based. Focus on service-level decision making aligned to official exam objectives. Priority concepts: eigrp, ospf, bgp, redistribution, route map, prefix list.

What ENARSI Expects

  • Anchor your answer in select the most practical, secure, and scalable answer for the stated scenario.
  • Layer 3 Technologies scenarios for ENARSI are frequently mapped to Domain 1 (35%), so read the objective carefully before picking controls or architecture.
  • Expect multi-service scenarios where Layer 3 Technologies 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 Layer 3 Technologies Concepts

  • Know the core Layer 3 Technologies building blocks cold: eigrp, ospf, bgp, redistribution.
  • Review the edge-case features and limits for route map, prefix list; these details are commonly used to differentiate answer choices.
  • Practice service-integration reasoning: how Layer 3 Technologies pairs with VPN Technologies, Troubleshooting in real deployment patterns.
  • For ENARSI, explain why the chosen Layer 3 Technologies design meets reliability, security, and cost expectations better than the alternatives.

Common ENARSI Traps

  • Watch for answers that partially solve the requirement but miss operational constraints.
  • Questions in Layer 3 Technologies often include distractors that look correct for Layer 3 Technologies 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 Layer 3 Technologies implementation paths and justify which one best fits the scenario?
  • Can you map the chosen answer back to Layer 3 Technologies (35%) outcomes for ENARSI?
  • Can you explain security and access boundaries for Layer 3 Technologies without relying on default-open assumptions?
  • Can you describe how Layer 3 Technologies integrates with VPN Technologies and Troubleshooting during failure, scaling, and monitoring events?

Exam Domains Covering Layer 3 Technologies

Domain 1Layer 3 Technologies35%

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