A technician connects a Cisco Aironet 3700 Series access point to a switch and realizes that the AP is coming up with 3x3 MIMO.
What explains this behavior?
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A. B. C. D.D.
The correct answer is D. The switch is PoE+ capable.
The Cisco Aironet 3700 Series access point supports 802.11ac Wave 1 and Wave 2 standards, which provide high-speed wireless connectivity using MIMO technology. The access point is designed to support multiple input and multiple output (MIMO) streams, which can be used to increase the wireless throughput and improve the overall performance of the network.
The 3700 Series access point has three spatial streams for transmitting and receiving data, which is known as 3x3 MIMO. In order to achieve this level of MIMO, the access point requires sufficient power to operate all three antennas.
In the context of the given scenario, the technician has connected the access point to a switch. The behavior of the access point indicates that it is able to operate in 3x3 MIMO mode, which means that it is receiving sufficient power from the switch.
Option A, which states that a redundant power supply is unavailable on the switch, is not relevant to the behavior of the access point. Redundant power supplies are used to provide backup power to a device in case the primary power source fails, and do not affect the MIMO capability of the access point.
Option B, which states that the switch is 802.3af capable, is also not relevant to the behavior of the access point. 802.3af is a standard for Power over Ethernet (PoE), which provides up to 15.4 watts of power to a device. While the access point may be able to operate with 802.3af power, it would not be able to operate in 3x3 MIMO mode with this level of power.
Option C, which states that the access point is getting power from a power injector, is also not relevant to the behavior of the access point. A power injector is a device that injects power into an Ethernet cable to power a device, and does not affect the MIMO capability of the access point.
Option D, which states that the switch is PoE+ capable, is the correct answer. PoE+ provides up to 30 watts of power to a device, which is sufficient to power the access point and enable it to operate in 3x3 MIMO mode. Therefore, the behavior of the access point indicates that it is receiving sufficient power from the switch, which is PoE+ capable.