Quick Answer
The correct answer is 802.11r, the IEEE standard that enables fast roaming for mobile Wi-Fi clients. This standard, formally known as Fast BSS Transition (FT), allows a client to roam seamlessly between access points without needing to fully re-authenticate at each new AP. It accomplishes this by caching a Pairwise Master Key (PMK) from the initial authentication and using an optimized four-way handshake that reduces reassociation time to under 50 milliseconds, ensuring uninterrupted connectivity as employees move between floors. On the CompTIA Network+ N10-009 exam, this question tests your understanding of wireless roaming technologies and often appears alongside 802.11k (neighbor reports) and 802.11v (network management) as part of the “kvr” trio for seamless mobility. A common trap is confusing 802.11r with 802.1X or WPA2-Enterprise; remember that 802.11r specifically handles the fast handoff, not the initial authentication method. Memory tip: think “r” for “rapid roaming” or “reauthentication removed.”
This N10-009 practice question tests your understanding of network implementation. 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.
A company is deploying a wireless network in an office where employees move between floors. They want clients to authenticate once and maintain connectivity without re-authenticating when roaming between access points (APs). Which IEEE wireless standard provides this fast roaming capability?
802.11r
Correct. 802.11r enables fast roaming by pre-establishing security keys with candidate APs.
802.11i
Why wrong: 802.11i defines security enhancements (WPA2), not fast roaming.
802.11e
Why wrong: 802.11e provides Quality of Service (QoS) for multimedia, not roaming.
802.11n
Why wrong: 802.11n increases throughput using MIMO and channel bonding, but does not address roaming.
Answer choices
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 clients to roam between access points without re-authenticating at each new AP. It achieves this by using a cached Pairwise Master Key (PMK) and a four-way handshake that is optimized to reduce the time required for reassociation, typically completing in under 50 milliseconds. This ensures seamless connectivity for mobile users moving between floors.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
802.11r
Why this is correct
Correct. 802.11r enables fast roaming by pre-establishing security keys with candidate APs.
Related concept
Read the scenario before looking for a memorised answer.
802.11i
Why it's wrong here
802.11i defines security enhancements (WPA2), not fast roaming.
802.11e
Why it's wrong here
802.11e provides Quality of Service (QoS) for multimedia, not roaming.
802.11n
Why it's wrong here
802.11n increases throughput using MIMO and channel bonding, but does not address roaming.
Common exam traps
Cisco often tests the distinction between 802.11i (security) and 802.11r (fast roaming), so the trap here is confusing the authentication protocol with the roaming optimization standard, leading candidates to pick 802.11i because it deals with keys and handshakes.
Detailed technical explanation
802.11r works by allowing the client and target AP to derive a new Pairwise Transient Key (PTK) from a cached PMK, eliminating the need for a full 802.1X/EAP exchange during roam. The protocol supports two modes: over-the-air (using FT Authentication frames) and over-the-DS (using the Distribution System), each with specific timing advantages. In real-world deployments, 802.11r is often combined with 802.11k (neighbor reports) and 802.11v (network-assisted roaming) to further optimize roaming decisions and reduce latency.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
The correct answer is: 802.11r — 802.11r, also known as Fast BSS Transition (FT), enables clients to roam between access points without re-authenticating at each new AP. It achieves this by using a cached Pairwise Master Key (PMK) and a four-way handshake that is optimized to reduce the time required for reassociation, typically completing in under 50 milliseconds. This ensures seamless connectivity for mobile users moving between floors.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
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Variation 1. 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?
mediumWhy B: 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.
Last reviewed: Jun 11, 2026
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