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Test your basic knowledge |
CWNA Wlan Troubleshooting
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
cwna
Instructions:
Answer 28 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. In a single channel architecture - each layer of multiple APs on a single channel and using the same virtual BSSID is known as a channel blanket
Antenna reciprocity
Layer 3 Roaming
Cell-sizing
Channel blankets
2. Placing multiple AP's in the same physical space to provide for greater capacity. In a multiple channel architecture (MCA) three AP's operating in the 2.4 GHz ISM band could be colocated in the same physical area.
Single channel architecture (SCA)
Colocation
Multiple channel architecture (MCA)
Hidden node
3. Degradation of performance caused by Layer 2 retransmissions resulting from overlapping frequency space that occurs because of an improper channel reuse design.
Intersymbol interference (ISI)
Signal-to-noise (SNR)
Airtime fairness
Adjacent-Cell interference
4. Mechanisms on a WLAN controller that prioritizes transmissions from stations with higher data rates over stations using lower data rates
Adjacent-Cell interference
Capacity
Intersymbol interference (ISI)
Airtime fairness
5. The ability for the client stations to transition from one AP and BSS to another while maintaining network connectivity for upper-layer applications.
Multiple channel architecture (MCA)
Cell-sizing
Roaming
Channel blankets
6. A WLAN architecture in which all AP in the network can be deployed on one channel in either the 2.4 GHz or 5 GHz frequency bands. Uplink and downlink transmissions are coordinated by a WLAN controller on a signal 802.11 channel in such a manner that
Delay spread
Single channel architecture (SCA)
Hidden node
Airtime fairness
7. Occurs when one client station's transmissions are unheard by other client stations in the BSS. Every time the hidden node transmits - there is a risk another stations is also transmitting and a collision can occur.
Hidden node
Multiple channel architecture (MCA)
Signal-to-noise (SNR)
Channel blankets
8. The area or distance that an RF signal can provide effective usable coverage.
Roaming
Range
Virtual BSSID
Antenna reciprocity
9. In order to avoid co-channel interference - a channel reuse pattern is necessary. Overlapping RF coverage cells are needed for roaming - but overlap frequencies must be avoided. The only 3 channels that meet these criteria in the 2.4 GHz ISM band are
Capacity
Intersymbol interference (ISI)
Channel reuse
Layer 3 Roaming
10. All-band interference is RF interference that occurs across the entire frequency range that is being used. The term all-band interference is typically associated with FHSS communications that disrupt HR-DSS and/or ERP-OFDM channel communications.
All-band interference
Range
Co-channel interference (CCI)
Colocation
11. The delay between the reception of the main signal and the reflected signal
Delay spread
Colocation
near/far
Coverage
12. A propagation phenomenon that results in two or more paths of a signal arriving at a receiving antenna at the same time or within nanoseconds of each other.
Coverage
Multipath
Fast secure roaming (FSR)
Cyclic redundancy check (CRC)
13. Any roaming technology that allows mobile-device users to move from one layer 3 network to another while maintaining their original IP address
Antenna reciprocity
Layer 3 Roaming
Airtime fairness
Signal-to-noise (SNR)
14. The concept that antennas amplify received signals just as they amplify transmitted signals
Fast secure roaming (FSR)
Cell-sizing
Antenna reciprocity
Hidden node
15. A mechanism in which client station resources data is gathered and processed by an AP or WLAN controller.
Radio resource measurement (RRM)
Co-channel interference (CCI)
near/far
Antenna reciprocity
16. Determining how big the cell size needs to be to provide the desired coverage - and adjusting the power level of the AP in order to create a cell of the desired size. Cell-sizing is almost always the preferable method for meeting capacity needs in an
Coverage
Intersymbol interference (ISI)
Cell-sizing
Cyclic redundancy check (CRC)
17. Proper network design entails providing the necessary coverage while trying to limit the number of devices connected to any single AP at the same time. This design process ensures the highest level of throughput to the individual stations by limiting
All-band interference
Signal-to-noise (SNR)
Virtual BSSID
Capacity
18. Data corruption cause by the delay spread in a multipath environment. The difference in time between the primary signal and the reflected signals causes problems for the receiver when demodulating the RF signals information. The delay spread time dif
near/far
Range
Multipath
Intersymbol interference (ISI)
19. The SNR is the difference in decibels between a received signal and the background noise. The SNR is an important value because - if the background noise is too close to the received signal - data can get corrupted and retransmissions will increase.
Signal-to-noise (SNR)
Cell-sizing
Range
Multipath
20. An error-detecting code
Multipath
Roaming
Multiple-input multiple-output (MIM0)
Cyclic redundancy check (CRC)
21. BSSID is typically the MAC address of the AP's radio card and the layer 2 identifier of a BSS. Because AP's are capable of advertising multiple SSIDs - and because each SSID requires a separate BSSID - the AP will generate virtual BSSID addresses
Antenna reciprocity
Virtual BSSID
Capacity
Signal-to-noise (SNR)
22. A wireless network design in which AP's are configured with the power set to the maximum level to provide the largest coverage area possible. Coverage also defines the physical area where a usable signal can be received by the station
Colocation
Intersymbol interference (ISI)
Roaming
Coverage
23. Also known as dynamic rate shifting - adaptive rate selection - or automatic rate selection. A process that client stations use to shift to lower-bandwidth capabilities as they move away from an AP and to higher-bandwidth capabilities as they move to
Colocation
Dynamic rate switching (DRS)
Adjacent-Cell interference
Radio resource measurement (RRM)
24. A low-powered client station that is a great distance from the AP could become an unheard client if other high-powered stations are very close to the access point. The transmissions of high-powered stations can raise the noise floor to a higher level
near/far
Colocation
Fast secure roaming (FSR)
Layer 3 Roaming
25. Unnecessary medium contention overhead that occurs when AP with overlapping coverage cells are configured to transmit on the same frequency channel. Because of the CSMA/CA - all nearby AP's and clients on the same channel will defer transmissions. Th
Signal-to-noise (SNR)
Multiple-input multiple-output (MIM0)
Co-channel interference (CCI)
Capacity
26. A WLAN channel reuse pattern with overlapping coverage cells that utilize three channels at 2.4GHz or numerous channels at 5 GHz.
Multipath
Multiple channel architecture (MCA)
Virtual BSSID
Dynamic rate switching (DRS)
27. Any RF communications system that has multiple antennas at both ends of the communication link and being used concurrently.
Multiple-input multiple-output (MIM0)
Coverage
Multipath
Co-channel interference (CCI)
28. Defines faster handoffs when roaming occurs between cells in a wireless LAN using the strong security defined in a robust security network. Fast and secure 802.11 roaming is needed to meet latency requirements for time-senstive applications in a WLAN
Dynamic rate switching (DRS)
Channel blankets
Radio resource measurement (RRM)
Fast secure roaming (FSR)