300-425 · Question #236
A customer has multiple WGBs located around a warehouse to support mobile and stationary industrial machines. The wireless network consists of these components: - two Cisco 5520 WLCs in a high…
The correct answer is B. 52, 56, 60, 64. UNII 2 covers channels 52, 56, 60, and 64 in the 5.25-5.35 GHz range; restricting WGB channel scanning to these four channels reduces scan time and improves roaming for mobile machines.
Question
A customer has multiple WGBs located around a warehouse to support mobile and stationary industrial machines. The wireless network consists of these components:
- two Cisco 5520 WLCs in a high availability cluster
- 100 Cisco 2800 APs in local mode
- 25 Cisco IW3700 Series APs in WGB mode
- WLANs that are all 802.11a only
- UNII 1, UNII 2, and UNII 2E channels in use
The customer wants to use only UNII 2 channels within the mobile machine area of the warehouse and must reduce the channel scan time on the WGBs. Which channels must be incorporated in the design for the WGBs?
Options
- A36, 40, 44, 48
- B52, 56, 60, 64
- C100, 104, 108, 112
- D149, 153, 157, 161
How the community answered
(46 responses)- A7% (3)
- B74% (34)
- C4% (2)
- D15% (7)
Why each option
UNII 2 covers channels 52, 56, 60, and 64 in the 5.25-5.35 GHz range; restricting WGB channel scanning to these four channels reduces scan time and improves roaming for mobile machines.
Channels 36, 40, 44, and 48 belong to the UNII 1 band (5.15-5.25 GHz), not UNII 2.
Channels 52, 56, 60, and 64 are the four 20 MHz channels within the UNII 2 band (5.25-5.35 GHz). By configuring WGBs to scan only these channels rather than the full UNII 1, UNII 2, and UNII 2E set currently in use, the channel scan list is shortened, reducing the time the WGB spends off-channel scanning and improving handoff latency for mobile industrial machines.
Channels 100, 104, 108, and 112 are part of the UNII 2E band (5.47-5.725 GHz), not UNII 2.
Channels 149, 153, 157, and 161 belong to the UNII 3 band (5.725-5.85 GHz), not UNII 2.
Concept tested: UNII 2 channel identification for WGB scan optimization
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/radio_resource_management.html
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