Practice Free CWNA-109 Exam Online Questions
You are evaluating a connection that states the data rate is 150 Mbps.
What is the expected throughput of this connection?
- A . Less than 150 Mbps because of 802.11 overhead and contention
- B . 54 Mbps because that is the actual maximum throughput of an 802.11 connection
- C . More than 150 Mbps because of compression
- D . 150 Mbps because the data rate is equal to the throughput
A
Explanation:
The data rate of a signal is the speed that the data bits in individual 802.11 data frames are sent, but it does not account for the actual amount of data that can be transmitted over time. The throughput of a connection is the flow of information over time, which is affected by various factors such as data encoding, modulation, encryption, airtime utilization, noise levels, interference, etc. Therefore, the throughput is always lower than the data rate. According to one of the web search results1, the actual throughput is normally 60-70 percent of the supported data rates. So, for a connection with a data rate of 150 Mbps, the expected throughput would be around 90-105 Mbps.
What are the two key components when designing an 802.11 wireless network?
- A . Coverage
- B . Maintenance
- C . Ceiling height
- D . Performance
What is the default minimum size of a resource unit if 1024-QAM modulation is used by an 802.11ax radio?
- A . 26-tone
- B . 52-tone
- C . 106-tone
- D . 242-tone
- E . 484-tone
What are some potential problems when enabling 40 MHz channels in the 5 GHz band? (Choose all that apply.)
- A . Adjacent channel interference
- B . Co-channel interference
- C . Higher SNR
- D . Lower SNR
- E . Decreased range
What are the required data rates of an OFDM station?
- A . 3, 6, and 12 Mbps
- B . 6, 9, 12, 18, 24, 36, 48, and 54 Mbps
- C . 6, 12, 24, and 54 Mbps
- D . 6, 12, and 24 Mbps
- E . 1, 2, 5.5, and 11 Mbps
How is throughput capacity scaled in a single channel architecture (SCA) WLAN system?
- A . By increasing transmit power and placing APs that are on a single channel farther from one another.
- B . By adding more SSIDs to existing APs to spread users across different contention domains.
- C . By adding non-overlapping channel layers through the addition of more APs.
- D . By using downlink data compression and uplink flow control at the AP.
- E . By using a single 802.11n radio to transmit simultaneous downlink data streams to different users.
What causes of hidden nodes within a BSS would be more likely lead to an increase in collisions and retries? (Choose 2)
- A . Data frames too large for the physical environment
- B . Client stations broadcasting with too much power
- C . Access points broadcasting with too little power
- D . Client stations too close in proximity to each other
- E . Obstacles between client stations causing attenuation
- F . Large 802.11 cells with physically distributed stations
WMM is based on EDCA and provides for traffic prioritization via which of the following access categories? (Choose all that apply.)
- A . WMM Voice priority
- B . WMM Video priority
- C . WMM Audio priority
- D . WMM Best Effort priority
- E . WMM Background priority
Which 802.11 radio technologies are most impacted by the destructive effects of multipath? (Choose all that apply.)
- A . 802.11a
- B . 802.11b
- C . 802.11g
- D . 802.11n
- E . 802.11i
What factors influence the distance that an RF signal can be effectively received? (Choose 3)
- A . Transmitting station’s power source
- B . Receiving station’s radio sensitivity
- C . Free Space Path Loss
- D . MAC layer encryption
- E . Transmitting station’s output power
- F . Temperature in the Fresnel zone