Which one does the roaming of terminals in different VLANs belong to?

Question

Options

• AIEEE 802.11c
• BIEEE 802.11h
• CIEEE 802.11j
• DIEEE 802.11r

• A
  11% (3)
• B
  7% (2)
• C
  4% (1)
• D
  78% (21)

Explanation

IEEE 802.11r, known as Fast BSS Transition (Fast Roaming), is the amendment that governs seamless handoff of wireless clients between access points, including when those APs belong to different VLANs. It reduces the time and overhead required for a device to re-authenticate when moving across network boundaries, making it essential for environments like VoIP or real-time video where connection drops are costly.

IEEE 802.11c covers bridge operations for access points and has nothing to do with client roaming. IEEE 802.11h addresses spectrum management features such as Dynamic Frequency Selection and Transmit Power Control, primarily for 5 GHz operation in Europe. IEEE 802.11j extends 802.11a operation for the Japanese regulatory domain at 4.9 GHz and 5 GHz, again unrelated to roaming across VLANs.

Memory tip: The letter "r" in 802.11r stands for roaming - the simplest way to lock in the correct answer on exam day.

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