300-370 · Question #53
A WLAN engineer has just completed a wireless network installation using Cisco 2700 series access points. After checking the WLC, it seems that the APs are running in medium power. What effect will…
The correct answer is C. Due to insufficient power the access points have dynamically shifted from 3x4 to 3x3. When Cisco 2700 series access points operate with insufficient power, they reduce their Multiple Input, Multiple Output (MIMO) capabilities to conserve energy.
Question
A WLAN engineer has just completed a wireless network installation using Cisco 2700 series access points. After checking the WLC, it seems that the APs are running in medium power. What effect will this have in the APs?
Options
- ADue to insufficient power, the access points are not broadcasting any Wireless networks.
- BDue to insufficient power, only the 2 4 GHz radio is up.
- CDue to insufficient power the access points have dynamically shifted from 3x4 to 3x3.
- DDue to insufficient power the access points have dynamically shifted from 4x4 to 3x3.
How the community answered
(45 responses)- A7% (3)
- B16% (7)
- C73% (33)
- D4% (2)
Why each option
When Cisco 2700 series access points operate with insufficient power, they reduce their Multiple Input, Multiple Output (MIMO) capabilities to conserve energy.
Insufficient power typically causes a reduction in features or performance, not a complete cessation of broadcasting for an AP still operating in a medium-power state.
While some lower-end APs might disable one radio entirely, the 2700 series at medium power generally reduces MIMO capabilities across active radios rather than disabling a whole frequency band.
Cisco Aironet 2700 series APs typically feature 3x4:3 MIMO operation; if operating in a medium power state, they dynamically degrade their functionality, which can include shifting from a 3x4 (3 transmit, 4 receive) configuration to 3x3 (3 transmit, 3 receive) to ensure basic operation under reduced power.
Cisco Aironet 2700 series APs are specified for 3x4:3 MIMO operation, not 4x4, so a degradation from 4x4 to 3x3 is incorrect for this specific model.
Concept tested: AP power modes and MIMO capabilities
Source: https://www.cisco.com/c/en/us/products/collateral/wireless/aironet-access-points/white-paper-c11-736932.html
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