Practice Free CWNA-109 Exam Online Questions
What PHY layer mechanisms might be used to increase the range for an 802.11n radio using a MIMO system? (Choose all that apply.)
- A . Maximum ratio combining
- B . Guard interval
- C . Transmit beamforming
- D . Spatial multiplexing
In the 1970’s _______ had a wireless communication model for transmitting between islands.
- A . China
- B . Hawaii
- C . Alaska
- D . Russia
You have implemented an 802.11ax WLAN for a customer. All APs are four stream HE APs. The customer states that it is essential that most of the clients can use the OFDMA modulation scheme.
What do you tell the customer?
- A . The clients that must support OFDMA must also be upgraded to 802.11ax
- B . OFDMA is an optional feature of 802.11ax and most APs don’t even support it
- C . All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz
- D . If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
A
Explanation:
OFDMA is a new modulation scheme introduced in 802.11ax that allows multiple users to share the same channel by dividing it into smaller subchannels called resource units (RUs). This improves the efficiency and capacity of the WLAN by reducing contention and overhead. However, to use OFDMA, both the AP and the client must support 802.11ax and negotiate the parameters of the subchannel allocation. Therefore, the customer needs to upgrade the clients that require OFDMA to 802.11ax devices12.
The other options are not correct because they do not reflect the reality of OFDMA. Option B is incorrect because OFDMA is a mandatory feature of 802.11ax for both downlink and uplink transmissions, and all 802.11ax APs must support it1. Option C is incorrect because OFDM and OFDMA are different modulation schemes, and OFDM does not allow multiple users to share the same channel. Option D is incorrect because 802.11ac devices cannot support OFDMA through driver upgrades, as they lack the hardware and firmware capabilities to do so2.
Reference: 1: CWNA-109 Official Study Guide, page 144 2: OFDMA
Which of these client radios will be able to transmit in the U-NII-5 band?
- A . Wi-Fi 4 client radios
- B . Wi-Fi 5 client radios
- C . Wi-Fi 6 client radios
- D . Wi-Fi 6E client radios
- E . Wi-Fi 7 client radios
Which of these measurements are taken for indoor coverage analysis? (Choose all that apply.)
- A . Received signal strength
- B . Signal-to-noise ratio
- C . Noise level
- D . Path loss
- E . Packet loss
Which of the following is true for MIMO transmissions?
- A . The transceiver can only receive from one antenna at a time.
- B . Transceivers can transmit from multiple antennas at the same time.
- C . The transceiver samples multiple antennas and chooses the best received signal from one antenna.
- D . Transceivers can transmit from only one antenna at a time.
Which of the following refers to the polar chart of an antenna as viewed from above the antenna? (Choose all that apply)
- A . Horizontal view
- B . Vertical view
- C . H-plane
- D . E-plane
- E . Elevation chart
- F . Azimuth chart
Which of the following is a type of wireless topology? (Choose two)
- A . Wireless World Area Network (WWAN)
- B . Wireless Metropolitan Area Network (WMAN)
- C . Wireless Perimeter Area Network (WPAN)
- D . Wireless Local Area Network (WLAN)
Which of these protocols can be used to configure WLAN infrastructure devices?
- A . HTTP
- B . SSH
- C . SNMP
- D . Telnet
- E . HTTPS
- F . SNMP
- G . All of the above
Scott is an administrator at the Williams Lumber Company, and his WIPS has detected a rogue access point.
What actions should he take after the WIPS detects the rogue AP? (Choose the best two answers.)
- A . Enable the layer 2 rogue containment feature that his WIPS provides.
- B . Unplug the rogue AP from the electrical outlet upon discovery.
- C . Call the police.
- D . Call his mother.
- E . Unplug the rogue AP from the data port upon discovery.