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Question 1,258 of 1,052
hardmultiple choiceObjective-mapped
CCNA Practice Question: An engineer is troubleshooting a wireless network…
This 200-301 practice question tests your understanding of 200-301 exam topics. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
WLC# show ap config general AP-Second-Floor AP Name ........................... AP-Second-Floor MAC Address ...................... 00:1a:2b:3c:4d:5e IP Address ........................ 192.168.2.102 Country Code .................... US - United States Regulatory Domain ................ 802.11bg - 2.4 GHz, 802.11a - 5 GHz Operational Status ............... UP Primary WLC IP ................... 192.168.1.10 Secondary WLC IP ................. 0.0.0.0 802.11a (5 GHz) Configuration: Admin State .................... ENABLED Channel Width .................. 80 MHz Channel ........................ 36 (DFS) Tx Power Level ................. 1 (max) 802.11b/g (2.4 GHz) Configuration: Admin State .................... ENABLED Channel Width .................. 20 MHz Channel ........................ 6 Tx Power Level ................. 1 (max) Client Roaming: Load Balancing ................. DISABLED Band Select .................... ENABLED Fast Roaming (802.11r) ......... ENABLED Fast Roaming Over DS ........... DISABLED PMKID Support .................. ENABLED Neighbor APs: AP-Second-Floor sees AP-First-Floor on channel 100 (DFS) with RSSI -85 dBm
An engineer is troubleshooting a wireless network where clients report frequent disconnections and poor performance when roaming between two floors. The network uses 802.11ax (Wi-Fi 6) APs with WPA3-Enterprise and channel bonding enabled. The engineer checks the WLC and notices that clients on the first floor associate correctly but fail to maintain connectivity when moving to the second floor. A show command on the WLC reveals the following output. What is the most likely cause of the roaming issue?
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.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
The APs are on different DFS channels and Fast Roaming Over DS is disabled, preventing seamless 802.11r roaming.
The exhibit shows that AP-Second-Floor is using channel 36 (DFS) with 80 MHz channel bonding. The neighbor AP (AP-First-Floor) is on channel 100 (DFS). DFS channels require radar detection and may cause APs to switch channels if radar is detected, but more critically, the two APs are on different DFS channels without overlapping coverage on the same channel, which prevents seamless 802.11r fast roaming. Fast roaming (802.11r) works best when APs are on the same channel or when the client can quickly authenticate via the DS; however, Fast Roaming Over DS is disabled here. This forces clients to perform full authentication when moving between different channels, causing disconnections. The correct answer is that the APs are on different DFS channels and Fast Roaming Over DS is disabled, which breaks seamless roaming.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The APs are using different regulatory domains causing channel mismatch.
Why it's wrong here
Both APs are in the US regulatory domain, so this is not a mismatch.
- ✓
The APs are on different DFS channels and Fast Roaming Over DS is disabled, preventing seamless 802.11r roaming.
Why this is correct
The exhibit shows AP-Second-Floor on channel 36 and AP-First-Floor on channel 100, both DFS. With Fast Roaming Over DS disabled, the client cannot use the DS to complete fast roaming between different channels, causing disconnections.
Clue confirmation
The clue words "first", "most likely" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The load balancing feature is disabled, causing all clients to stick to one AP.
Why it's wrong here
Load balancing being disabled might cause uneven client distribution but does not directly cause disconnections during roaming.
- ✗
The AP-Second-Floor is using channel 36 which is a DFS channel, and radar detection may have caused a channel switch.
Why it's wrong here
While DFS channels are susceptible to radar, the exhibit does not indicate any radar detection or channel switch. The issue is the mismatch and disabled Fast Roaming Over DS.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓The APs are on different DFS channels and Fast Roaming Over DS is disabled, preventing seamless 802.11r roaming.Correct answer▾
Why this is correct
The exhibit shows AP-Second-Floor on channel 36 and AP-First-Floor on channel 100, both DFS. With Fast Roaming Over DS disabled, the client cannot use the DS to complete fast roaming between different channels, causing disconnections.
✗The APs are using different regulatory domains causing channel mismatch.Wrong answer — click to see why▾
Why this is wrong here
The exhibit shows both APs are in the US regulatory domain, so this is not the issue.
✗The load balancing feature is disabled, causing all clients to stick to one AP.Wrong answer — click to see why▾
Why this is wrong here
Load balancing is disabled, but this does not directly cause roaming failures; it only affects distribution.
✗The AP-Second-Floor is using channel 36 which is a DFS channel, and radar detection may have caused a channel switch.Wrong answer — click to see why▾
Why this is wrong here
The exhibit shows no radar events; the symptom is consistent with a roaming configuration issue, not radar.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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 200-301 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 200-301 question test?
OSPF neighbours must agree on key parameters.
What is the correct answer to this question?
The correct answer is: The APs are on different DFS channels and Fast Roaming Over DS is disabled, preventing seamless 802.11r roaming. — The exhibit shows that AP-Second-Floor is using channel 36 (DFS) with 80 MHz channel bonding. The neighbor AP (AP-First-Floor) is on channel 100 (DFS). DFS channels require radar detection and may cause APs to switch channels if radar is detected, but more critically, the two APs are on different DFS channels without overlapping coverage on the same channel, which prevents seamless 802.11r fast roaming. Fast roaming (802.11r) works best when APs are on the same channel or when the client can quickly authenticate via the DS; however, Fast Roaming Over DS is disabled here. This forces clients to perform full authentication when moving between different channels, causing disconnections. The correct answer is that the APs are on different DFS channels and Fast Roaming Over DS is disabled, which breaks seamless roaming.
What should I do if I get this 200-301 question wrong?
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 200-301 OSPF questions on adjacency and route selection.
Are there clue words in this question I should notice?
Yes — watch for: "first", "most likely". 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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