FREE CWNA Wireless Network Administrator v1.0 Questions and Answers
The power source for a dual-band 802.11ac AP must be PoE. What power level should a class 4 device receive from the AP?
Explanation:
In general, a class 4 PoE device should be able to receive at least 25.5 watts of power, which is the minimum power output for this class.
A multi-AP WLAN you create needs fast, secure roaming to function. Which of the following techniques for fast roaming is an IEEE 802.11 standard technique?
Explanation:
Fast Transition (FT), or 802.11r, is an IEEE 802.11 standard method for fast roaming in a multi-AP WLAN.
To implement a WLAN, wireless controllers are used. When turned on and connected to the network, the APs must find the controllers. Which of the following techniques is typically employed by the APs to locate the controllers?
Explanation:
When an AP powers on and connects to the network, it requests an IP address from the DHCP server. If the DHCP server is configured with Option 43 for the wireless controller vendor, it will send the controller's IP address to the AP as part of the DHCP response. The AP can then use this information to connect with the controller.
The access points in your WLAN deployment are set to emit power levels of 10 mW on 2.4 GHz radios and 20 mW on 5 GHz radios.
There are also a few semi-directional antennas in use. What sort of deployment is being discussed?
Explanation:
A deployment of a WLAN with access points configured for ten mW of output power on the 2.4 GHz radios and 20 mW of output power on the 5 GHz radios, along with semi-directional antennas, is likely a Small Office/Home Office (SOHO) deployment.
According to the specifications for the WLAN you are installing, it must enable unidirectional delays of no more than 150 ms and have a maximum signal intensity of -67 dBm at all receivers. Which application meets these requirements?
Explanation:
The requirements for a WLAN to support unidirectional delays of less than 150 ms and a minimum signal strength of -67 dBm at all receivers are standard for Voice over Internet Protocol (VoIP) applications.
What 22 MHz channels in an 802.11 2.4 GHz system are regarded as non-overlapping?
The 2.4 GHz band channel 1's center frequency is 2.412 GHz (2412 MHz). What is channel 4's centred frequency?
Explanation:
The 2.4 GHz band in IEEE 802.11 WLAN systems is divided into 14 channels, each with a center frequency spaced 5 MHz apart. Channel 1 has a center frequency of 2.412 GHz; channel 2 has a center frequency of 2.417 GHz, and so on.
Therefore, to find the center frequency of channel 4, we need to add 15 times 5 MHz (since channel 4 is 15 channels away from channel 1):
Center frequency of channel 4 = 2.412 GHz + (15 x 5 MHz) = 2.427 GHz
So, the center frequency of channel 4 is 2.427 GHz (2427 MHz).