300-360 · Question #67
What is the result if a client radio is incapable of supporting all the 5 GHz channels you have deployed in the controller or APs?
The correct answer is C. This may result in coverage holes in the network. The 5 GHz band has many non-overlapping channels (UNII-1, UNII-2, UNII-2 Extended, UNII-3), but not all client radios support the full channel set - particularly UNII-2 Extended channels (e.g., channels 100–140), which require DFS support. If a client cannot tune to a channel…
Question
What is the result if a client radio is incapable of supporting all the 5 GHz channels you have deployed in the controller or APs?
Options
- AYou may only be able to deploy 20 MHz-wide channels.
- BThis may result in the client having to roam more frequently to find a channel it supports.
- CThis may result in coverage holes in the network.
- DYou may only be able to deploy 40 MHz-wide channels.
How the community answered
(23 responses)- A4% (1)
- B13% (3)
- C74% (17)
- D9% (2)
Explanation
The 5 GHz band has many non-overlapping channels (UNII-1, UNII-2, UNII-2 Extended, UNII-3), but not all client radios support the full channel set - particularly UNII-2 Extended channels (e.g., channels 100–140), which require DFS support. If a client cannot tune to a channel that an AP is operating on, that AP is effectively invisible to the client. In areas covered only by APs on unsupported channels, the client will experience a coverage hole - it cannot associate even though an AP is physically present and operational. This is a critical compatibility consideration when selecting channels for 5 GHz deployments in mixed-client environments.
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