H12-311_V3.0 · Question #50
The 802.11 physical layer standard defines some common operations of the wireless network at the physical layer: such as QoS, security, roaming and other operations.
The correct answer is B. False. Option B is correct because QoS, security, and roaming are not physical layer functions - they operate at the MAC sublayer or higher layers within the 802.11 standard. The physical layer (PHY) is concerned with signal modulation, frequency bands, encoding schemes, and raw data…
Question
The 802.11 physical layer standard defines some common operations of the wireless network at the physical layer: such as QoS, security, roaming and other operations.
Options
- ATrue
- BFalse
How the community answered
(45 responses)- A22% (10)
- B78% (35)
Explanation
Option B is correct because QoS, security, and roaming are not physical layer functions - they operate at the MAC sublayer or higher layers within the 802.11 standard. The physical layer (PHY) is concerned with signal modulation, frequency bands, encoding schemes, and raw data transmission rates, not higher-level network management tasks. Option A is wrong because it incorrectly attributes MAC-layer and upper-layer responsibilities to the physical layer; for example, QoS is defined in the 802.11e amendment at the MAC sublayer, security mechanisms like WPA2 come from 802.11i operating at the MAC and above, and roaming involves MAC and network layer coordination. A useful memory tip: think of the physical layer as handling only the "radio waves" - if a feature involves policy, identity, or mobility decisions rather than raw signal transmission, it belongs above the PHY layer.
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