Practice Free CWNA-109 Exam Online Questions
At maximum power requirements, a 24-port 802.3at-compliant PoE Ethernet switch must be able to provide about how many total watts of power to PoE devices on all ports?
- A . 15.4 watts
- B . 370 watts
- C . 720 watts
- D . 1,000 watts
- E . Not enough information is provided to answer the question.
Wi-Fi technology is used in many different vertical markets.
Which of these vertical markets use Wi-Fi for inventory control? (Choose all that apply.)
- A . Retail
- B . Manufacturing
- C . Education
- D . Law enforcement
- E . Hotspots
Which WLAN security mechanism requires that each WLAN user have unique authentication credentials?
- A . WPA-Personal
- B . 802.1X/EAP
- C . Open System
- D . WPA2-Personal
- E . WPA-PSK
How many channels should be used in a 5 GHz channel reuse pattern of 20 MHz channels?
- A . 3
- B . 4
- C . 8
- D . 12
- E . As many as available
What type of interference is caused by overlapping coverage cells with overlapping frequencies?
- A . Intersymbol interference
- B . Adjacent channel interference
- C . All-band interference
- D . Narrowband interference
- E . Co-channel interference
When antenna gain is reported in dBi, the gain of the antenna is compared to what theoretical radiator?
- A . End-fire radiator
- B . Dipole radiator
- C . Isotropic radiator
- D . Anthropomorphic radiator
C
Explanation:
An isotropic radiator is a theoretical point source of electromagnetic radiation that radiates equally in all directions. It has no physical dimensions and no preferred direction of radiation. It is used as a reference for antenna gain because it represents the ideal case of a perfect omnidirectional antenna12
Antenna gain is a measure of how well an antenna concentrates its radiated power in a certain direction. It is expressed in decibels (dB) relative to a reference antenna. When the reference antenna is an isotropic radiator, the antenna gain is denoted by dBi, which stands for decibels relative to isotropic12
For example, an antenna with a gain of 3 dBi means that it radiates 3 dB more power in its main direction than an isotropic radiator would. Conversely, an antenna with a gain of -3 dBi means that it radiates 3 dB less power in its main direction than an isotropic radiator would12
When using an RF splitter to connect one transceiver to sector antennas loss is incurred.
What is this loss called?
- A . Conversion loss
- B . Through loss
- C . Active loss
- D . Intentional loss
Which protocol is used by iOS and macOS devices for over-the-air provisioning of MDM profiles using certificates and SSL encryption?
- A . OAuth
- B . GRE
- C . SCEP
- D . XML
- E . HTTPS
Which of these attacks will not be detected by a wireless intrusion detection system (WIDS)?
- A . Deauthentication spoofing
- B . MAC spoofing
- C . Rogue access point
- D . Eavesdropping with a protocol analyzer
- E . Association flood
Which 802.11ac technology is the most revolutionary?
- A . 80 MHz and 160 MHz channel widths
- B . A-MPDU for all frames
- C . 256-QAM modulation
- D . 5 GHz only frequencies
- E . MU-MIMO
- F . Explicit beamforming