Cisco Cisco 5508 Wireless Controller Designanleitung

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Chapter 1      Cisco Adaptive wIPS Management Deployment Guide, Release 8.0
  Cisco Adaptive wIPS Introduction
On-Channel vs. Off-Channel Scanning per wIPS Mode
The figure below explains the radio’s behavior. When a radio is on its serving channel it is considered 
“on-channel”, when the radio is scanning other channels, it is considered “off-channel”.
An AP in local mode is mostly “on-channel”, making it difficult to detect attackers “off-channel”. A 
monitor mode AP is always “off-channel”, but cannot server clients, the WSM module provides a great 
combination of both.