The answer is 802.11r, also known as Fast BSS Transition (FT). This standard is the correct choice because it allows clients to roam between access points using a cached Pairwise Master Key (PMK), bypassing the need for a full 802.1X/EAP re-authentication with the RADIUS server. By reducing roaming latency to under 50 milliseconds, 802.11r fast roaming is essential for maintaining seamless voice and video calls over a wireless network. On the CompTIA Network+ N10-009 exam, this concept tests your understanding of wireless mobility and QoS; a common trap is confusing it with 802.11k (neighbor reports) or 802.11v (network management), which assist roaming but do not handle the authentication handoff. Remember the key distinction: 802.11r is about the *re-authentication shortcut*, not just discovery. For a memory tip, think "r for rapid roaming" or "PMK cached, no RADIUS rehashed."
N10-009 Network Implementation Practice Question
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 network engineer is deploying a wireless network using 802.11ac. To allow clients to roam between access points without re-authenticating to the authentication server, which IEEE standard should be implemented?
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 using a cached Pairwise Master Key (PMK) without requiring a full 802.1X/EAP re-authentication with the RADIUS server. This reduces roaming latency to under 50 ms, which is critical for voice and video applications.
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 a port-based access control standard for authentication, but it does not provide fast roaming on its own.
✓
802.11r
Why this is correct
802.11r enables fast roaming by using a caching mechanism that allows clients to reassociate quickly without full EAP exchanges.
Related concept
Read the scenario before looking for a memorised answer.
✗
802.11i
Why it's wrong here
802.11i is the security standard used by WPA2, defining encryption and authentication, not roaming.
✗
802.11e
Why it's wrong here
802.11e provides Quality of Service (QoS) enhancements for wireless, not fast roaming.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 802.1X (authentication framework) and 802.11r (fast roaming), leading candidates to mistakenly choose 802.1X because they associate it with 'authentication' without realizing the question specifically asks about avoiding re-authentication during roaming.
Detailed technical explanation
How to think about this question
802.11r works by allowing the client and target AP to derive a new PTK from a cached PMK-R1 (derived from the PMK-R0) using a single over-the-air or over-the-DS (Distribution System) FT Authentication exchange, bypassing the full EAP conversation. In real-world deployments, this is especially important in large-scale enterprise Wi-Fi (e.g., hospitals or warehouses) where clients move quickly and must maintain real-time sessions like VoIP calls without interruption.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
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 clients to roam between access points using a cached Pairwise Master Key (PMK) without requiring a full 802.1X/EAP re-authentication with the RADIUS server. This reduces roaming latency to under 50 ms, which is critical for voice and video applications.
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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