Question 1,063 of 2,015

Wireless Infrastructure →mediumMatchingObjective-mapped

Quick Answer

The answer is Over-the-DS Roaming matching to 802.11r. This is correct because 802.11r, also known as Fast BSS Transition (FT), streamlines the handoff process by allowing a client to pre-authenticate with a target access point over the Distribution System (DS), reducing the time-sensitive key exchange during roaming. On the ENCOR 350-401 exam, you must distinguish these three 802.11 roaming methods: 802.11k provides Radio Resource Measurement (RRM) for neighbor reports, helping clients discover nearby APs; 802.11v offers BSS Transition Management (BTM) for network-assisted roaming, where the AP suggests a better target. A common trap is confusing 802.11k’s discovery role with 802.11v’s suggestion role, or assuming all three handle the actual transition. To lock it in, remember the mnemonic: “k” for “know” (neighbor reports), “v” for “voice” (network suggests), and “r” for “rapid” (fast transition).

CCNP Wireless Infrastructure Practice Question

This 350-401 practice question tests your understanding of wireless infrastructure. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 each wireless roaming method on the left to its matching 802.11 standard on the right.

Question 1mediummatching

Read the full wireless explanation →

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

✓

Fast BSS Transition (FT): 802.11r

802.11r provides Fast BSS Transition (FT); 802.11k provides Radio Resource Measurement (RRM) for neighbor reports; 802.11v provides BSS Transition Management (BTM) for network-assisted roaming.

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?

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

What is the correct answer to this question?

The correct answer is: Fast BSS Transition (FT): 802.11r — 802.11r provides Fast BSS Transition (FT); 802.11k provides Radio Resource Measurement (RRM) for neighbor reports; 802.11v provides BSS Transition Management (BTM) for network-assisted roaming.

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

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 each wireless roaming method on the left to its matching 802.11 standard on the right.

medium

✓ P1.Fast BSS Transition (FT): 802.11r
✓ P2.Neighbor Report: 802.11k
✓ P3.Channel Information: 802.11k
✓ P4.BSS Transition Management: 802.11v
✓ P5.Network-assisted power saving: 802.11v

Why P1: 802.11r enables fast BSS transition (FT) with reduced reauthentication time; 802.11k provides neighbor report and channel information; 802.11v offers network-assisted power saving and BSS transition management.

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