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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. 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
Colocation
Airtime fairness
Single channel architecture (SCA)
Delay spread
2. Mechanisms on a WLAN controller that prioritizes transmissions from stations with higher data rates over stations using lower data rates
Airtime fairness
Virtual BSSID
Delay spread
Coverage
3. A mechanism in which client station resources data is gathered and processed by an AP or WLAN controller.
Signal-to-noise (SNR)
Radio resource measurement (RRM)
Channel blankets
Virtual BSSID
4. The concept that antennas amplify received signals just as they amplify transmitted signals
Multiple channel architecture (MCA)
Virtual BSSID
Antenna reciprocity
All-band interference
5. The ability for the client stations to transition from one AP and BSS to another while maintaining network connectivity for upper-layer applications.
Multipath
Virtual BSSID
Roaming
Co-channel interference (CCI)
6. Degradation of performance caused by Layer 2 retransmissions resulting from overlapping frequency space that occurs because of an improper channel reuse design.
Colocation
Adjacent-Cell interference
Channel reuse
Multiple-input multiple-output (MIM0)
7. 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
Hidden node
Intersymbol interference (ISI)
Colocation
Capacity
8. 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.
Colocation
Single channel architecture (SCA)
All-band interference
Cell-sizing
9. An error-detecting code
Channel reuse
Coverage
Cyclic redundancy check (CRC)
Hidden node
10. A WLAN channel reuse pattern with overlapping coverage cells that utilize three channels at 2.4GHz or numerous channels at 5 GHz.
Cyclic redundancy check (CRC)
Multiple channel architecture (MCA)
Delay spread
near/far
11. 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
Multiple-input multiple-output (MIM0)
Single channel architecture (SCA)
Airtime fairness
Co-channel interference (CCI)
12. 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
near/far
Cell-sizing
Dynamic rate switching (DRS)
Adjacent-Cell interference
13. 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
Co-channel interference (CCI)
Airtime fairness
Capacity
Coverage
14. 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
Radio resource measurement (RRM)
Multiple-input multiple-output (MIM0)
Virtual BSSID
Colocation
15. The delay between the reception of the main signal and the reflected signal
Delay spread
Dynamic rate switching (DRS)
Intersymbol interference (ISI)
Capacity
16. 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
Channel reuse
All-band interference
Intersymbol interference (ISI)
17. 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
Airtime fairness
Hidden node
Roaming
near/far
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
Single channel architecture (SCA)
Intersymbol interference (ISI)
Cell-sizing
All-band interference
19. The area or distance that an RF signal can provide effective usable coverage.
Signal-to-noise (SNR)
Range
Multipath
Coverage
20. 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
Signal-to-noise (SNR)
Fast secure roaming (FSR)
Channel blankets
Roaming
21. 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.
Hidden node
Range
Delay spread
Multipath
22. Any RF communications system that has multiple antennas at both ends of the communication link and being used concurrently.
Multiple-input multiple-output (MIM0)
Intersymbol interference (ISI)
Delay spread
Range
23. Any roaming technology that allows mobile-device users to move from one layer 3 network to another while maintaining their original IP address
Fast secure roaming (FSR)
Layer 3 Roaming
Delay spread
Signal-to-noise (SNR)
24. 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
Co-channel interference (CCI)
Channel blankets
All-band interference
Fast secure roaming (FSR)
25. 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.
Hidden node
All-band interference
Fast secure roaming (FSR)
Dynamic rate switching (DRS)
26. 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
Multiple-input multiple-output (MIM0)
Channel reuse
Multiple channel architecture (MCA)
Delay spread
27. 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
Cell-sizing
Virtual BSSID
Dynamic rate switching (DRS)
Airtime fairness
28. 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)
Fast secure roaming (FSR)
Co-channel interference (CCI)
Coverage