The Cisco Unified Wireless Network is designed to dynamically manage and optimize wireless coverage and performance by constantly monitoring and adjusting to changing conditions. In the case of Wi-Fi channel overlap, the network will analyze client load and background noise and dynamically assign channels to minimize interference and optimize throughput. This ensures that the network can provide reliable and high-performance Wi-Fi connectivity to all clients, even in challenging environments with high levels of interference.
Totally C
In a Cisco Unified Wireless Network, the response to Wi-Fi channel overlap is managed through Radio Resource Management (RRM). Here’s how it works:
Automatic Channel Selection:
Cisco APs (Access Points) use RRM to automatically select channels for operation.
When APs detect channel overlap or interference, RRM dynamically adjusts the channel assignments.
It aims to minimize interference and optimize performance.
Amongst other things.
These questions are often worded in a very deliberate way. Because this asks how the Cisco Unified Wireless Network RESPONDS to channel overlap, I go with C over D. The way Band Select works is to cause 5ghz-capable clients to join the 5ghz band, but it does this all the time when Band Select is enabled, not as a response to any conditions. DCA is a response to channel overlap.
A Cisco Unified Wireless network does not alternate automatically between 2.4 GHz and 5 GHz on adjacent access points. The network instead analyzes the client load and background noise on different channels and dynamically assigns a channel that will provide the best performance for the wireless network. It does not make use of switching between 2.4 and 5GHz as this is not how it's designed to handle channel overlap. This helps to ensure that there is minimal channel overlap and that the wireless network is operating at optimal performance. that is why D is not correct
Ref: Enterprise Mobility 8.1 Design Guide – Cisco
“C H A P T E R 3
WLAN RF Design Considerations
…
Radio Resource Management – RRM
…
What RRM Does
RRM consists of four algorithms:
1. RF Grouping
2. DCA (Dynamic Channel Assignment)
…
DCA – Dynamic Channel Assignment
Dynamic Channel Assignment is responsible for monitoring the spectrum, and choosing the best channel
plan to place the AP’s on. Interference is the primary concern, the less interference there is the more
bandwidth (airtime) we can use. To do this DCA monitors four parameters
• Signal—any Wi-Fi signal created by my network/RF Group
• Noise—any RF signal that is not identified as Wi-Fi; this includes collisions and packets to low to be demodulated as well.
• Interference—any Wi-Fi signal that is from Rogue devices or devices not part of my RF Group
• Load—The relative channel utilization of AP’s in the RF Group
…”
I think it's C... Can be found in provided link: DCA Algorithm
Same Channel Contention—other AP's/clients on the same channel - also known as Co-Channel interference or CCI
Foreign Channel - Rogue—Other non RF Group AP's operating on or overlapping with the AP's served channel
Noise—Non-Wi-Fi sources of interference such as Bluetooth, analog video, or cordless phones - see CleanAir for useful information on using CleanAir to detect noise sources
Channel Load—through the use of industry standard QBSS measurements - these metrics are gathered from the Phy layer - very similar to CAC load measurements.
DCA Sensitivity—A sensitivity threshold selectable by the user that applies hysteresis to the evaluation on channel changes
Answer D doesn't fix problem 2 and 3 resulting in overlap.
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