Question 488 of 2,015

BGP →mediumDrag & DropObjective-mapped

Quick Answer

The correct order for BGP policy application is: create the prefix-list or AS-path ACL, define the route-map with match and set clauses, apply the route-map to a neighbor under the BGP address-family, clear the BGP session, and then verify with show ip bgp. This sequence follows the logical dependency that matching tools like prefix-lists must exist before the route-map can reference them, and the route-map must be applied before the session reset triggers the policy to take effect. On the ENCOR 350-401 exam, this drag-and-drop task tests your understanding of the BGP policy application order, often appearing in the advanced routing section; a common trap is placing "clear bgp" before applying the route-map, which would leave the policy unapplied. Remember the mnemonic "Match, Map, Apply, Clear, Verify" to keep the steps straight from first to last.

350-401 BGP Practice Question

This 350-401 practice question tests your understanding of bgp. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

Drag and drop the steps of BGP policy application (route-map, prefix-list, AS-path ACL) into the correct order, from first to last.

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

Question 1mediumdrag order

Open the full BGP breakdown →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Create prefix-list or AS-path ACL

First, you create the prefix-list or AS-path ACL to match routes. Then you define the route-map with match and set clauses. Next, you apply the route-map to a neighbor under the BGP address-family. After that, you clear the BGP session to apply the policy. Finally, you verify the policy effect with show ip bgp.

Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

Common exam traps

Common exam trap: OSPF can fail even when IP connectivity looks correct

OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.

Detailed technical explanation

How to think about this question

OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.

KKey Concepts to Remember

OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.

TExam Day Tips

Check area mismatch first when OSPF adjacency fails.
Review passive interfaces when a network is advertised but no neighbour forms.
Use show ip ospf neighbor and show ip route clues carefully.

Key takeaway

OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

Real-world example

How this comes up in practice

A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.

What to study next

Got this wrong? Here's your next step.

Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.

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FAQ

Questions learners often ask

What does this 350-401 question test?

BGP — This question tests BGP — OSPF neighbours must agree on key parameters..

What is the correct answer to this question?

The correct answer is: Create prefix-list or AS-path ACL — First, you create the prefix-list or AS-path ACL to match routes. Then you define the route-map with match and set clauses. Next, you apply the route-map to a neighbor under the BGP address-family. After that, you clear the BGP session to apply the policy. Finally, you verify the policy effect with show ip bgp.

What should I do if I get this 350-401 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

OSPF neighbours must agree on key parameters.

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Same concept, more angles

1 more ways this is tested on 350-401

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. Drag and drop the steps of BGP policy application (route-map, prefix-list, AS-path ACL) into the correct order, from first to last.

medium

✓ A.Define prefix-list or AS-path ACL
✓ B.Create route-map with match and set clauses
✓ C.Apply route-map to neighbor (in/out)
✓ D.Clear BGP session to activate policy
✓ E.Verify policy with show ip bgp neighbors

Why A: Policy application starts with defining match criteria (prefix-list or AS-path ACL), then creating a route-map with permit/deny and set actions, applying it to a neighbor, and finally verifying the policy effect.

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