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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. 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
Channel reuse
Capacity
Intersymbol interference (ISI)
Single channel architecture (SCA)
2. The ability for the client stations to transition from one AP and BSS to another while maintaining network connectivity for upper-layer applications.
Dynamic rate switching (DRS)
Roaming
Signal-to-noise (SNR)
Cyclic redundancy check (CRC)
3. An error-detecting code
Cell-sizing
Virtual BSSID
Dynamic rate switching (DRS)
Cyclic redundancy check (CRC)
4. 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
Cyclic redundancy check (CRC)
Antenna reciprocity
Cell-sizing
Multiple-input multiple-output (MIM0)
5. 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
Signal-to-noise (SNR)
Adjacent-Cell interference
Virtual BSSID
Layer 3 Roaming
6. 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
Fast secure roaming (FSR)
Co-channel interference (CCI)
7. 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
Co-channel interference (CCI)
Delay spread
Single channel architecture (SCA)
Layer 3 Roaming
8. A WLAN channel reuse pattern with overlapping coverage cells that utilize three channels at 2.4GHz or numerous channels at 5 GHz.
Multiple channel architecture (MCA)
Cell-sizing
Adjacent-Cell interference
Antenna reciprocity
9. 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
Airtime fairness
Channel blankets
Dynamic rate switching (DRS)
Single channel architecture (SCA)
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.
Adjacent-Cell interference
Hidden node
All-band interference
Dynamic rate switching (DRS)
11. 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
Adjacent-Cell interference
Virtual BSSID
Capacity
Single channel architecture (SCA)
12. 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
Co-channel interference (CCI)
near/far
Cell-sizing
Dynamic rate switching (DRS)
13. 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
Multiple-input multiple-output (MIM0)
Dynamic rate switching (DRS)
Channel blankets
Range
14. Degradation of performance caused by Layer 2 retransmissions resulting from overlapping frequency space that occurs because of an improper channel reuse design.
Adjacent-Cell interference
Cell-sizing
Signal-to-noise (SNR)
All-band interference
15. The area or distance that an RF signal can provide effective usable coverage.
Multipath
Range
Hidden node
Adjacent-Cell interference
16. A mechanism in which client station resources data is gathered and processed by an AP or WLAN controller.
Roaming
Radio resource measurement (RRM)
All-band interference
Adjacent-Cell interference
17. 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
Dynamic rate switching (DRS)
Virtual BSSID
Coverage
Adjacent-Cell interference
18. 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
Delay spread
Adjacent-Cell interference
All-band interference
Capacity
19. 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
Cell-sizing
Cyclic redundancy check (CRC)
All-band interference
Channel reuse
20. 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.
Cell-sizing
Capacity
Intersymbol interference (ISI)
Hidden node
21. Any roaming technology that allows mobile-device users to move from one layer 3 network to another while maintaining their original IP address
Roaming
Coverage
Multipath
Layer 3 Roaming
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)
Colocation
Airtime fairness
near/far
23. The concept that antennas amplify received signals just as they amplify transmitted signals
near/far
Intersymbol interference (ISI)
Antenna reciprocity
Delay spread
24. 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.
Dynamic rate switching (DRS)
Signal-to-noise (SNR)
Multipath
Hidden node
25. 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.
Range
Multipath
Signal-to-noise (SNR)
Roaming
26. The delay between the reception of the main signal and the reflected signal
Multipath
Delay spread
Hidden node
Colocation
27. 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
Fast secure roaming (FSR)
Roaming
Channel blankets
Airtime fairness
28. Mechanisms on a WLAN controller that prioritizes transmissions from stations with higher data rates over stations using lower data rates
Coverage
Fast secure roaming (FSR)
Capacity
Airtime fairness