This N10-009 practice question tests your understanding of network implementation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A company is implementing a new wireless network for employees. The network must support seamless roaming between access points. Which protocol should be configured on the wireless controller?
Why wrong: 802.1X is an authentication framework used for network access control. It provides security but does not itself enable fast roaming; it can cause delays during roaming unless combined with 802.11r.
B
802.11r
802.11r, also known as Fast BSS Transition, reduces the time required for a client to transition between APs by caching keying information, enabling seamless roaming.
C
802.11n
Why wrong: 802.11n is a wireless standard that improves throughput using MIMO and channel bonding. It does not address roaming efficiency.
D
802.3af
Why wrong: 802.3af is a PoE standard for powering devices over Ethernet. It has no impact on wireless roaming.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
802.11r
802.11r, also known as Fast BSS Transition (FT), enables seamless roaming by allowing a client to authenticate and derive encryption keys with a new access point before or during the reassociation process, reducing the time-sensitive handshake overhead. This is essential for real-time applications like VoIP or video calls where roaming delays must be under 50 ms to avoid perceptible drops.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
802.1X
Why it's wrong here
802.1X is an authentication framework used for network access control. It provides security but does not itself enable fast roaming; it can cause delays during roaming unless combined with 802.11r.
✓
802.11r
Why this is correct
802.11r, also known as Fast BSS Transition, reduces the time required for a client to transition between APs by caching keying information, enabling seamless roaming.
Related concept
Read the scenario before looking for a memorised answer.
✗
802.11n
Why it's wrong here
802.11n is a wireless standard that improves throughput using MIMO and channel bonding. It does not address roaming efficiency.
✗
802.3af
Why it's wrong here
802.3af is a PoE standard for powering devices over Ethernet. It has no impact on wireless roaming.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 802.1X (authentication) with 802.11r (fast roaming), assuming that any security-related protocol must handle roaming, when in fact 802.1X adds latency rather than reducing it.
Detailed technical explanation
How to think about this question
802.11r works by enabling the client to perform an initial FT authentication with the current AP, which generates a Pairwise Master Key (PMK) that is cached. When roaming, the client uses a PMK-R0 and PMK-R1 key hierarchy to derive a fresh Pairwise Transient Key (PTK) with the target AP without needing a full 802.1X/EAP re-authentication, cutting the handshake from roughly 100-300 ms to under 20 ms. In real-world deployments, 802.11r must be enabled on both the controller and the client; if the client does not support it, the controller falls back to standard roaming, which can cause brief disconnections during fast movement.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the N10-009 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this N10-009 question in full detail.
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 802.11r — 802.11r, also known as Fast BSS Transition (FT), enables seamless roaming by allowing a client to authenticate and derive encryption keys with a new access point before or during the reassociation process, reducing the time-sensitive handshake overhead. This is essential for real-time applications like VoIP or video calls where roaming delays must be under 50 ms to avoid perceptible drops.
What should I do if I get this N10-009 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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