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