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26.
Videoconferencing over Wi - Fi may contain what kinds of network traffic? (Choose all
that apply.)
- A.Session initiation and teardown
- B.Data
- C.Real- time video
- D.Real- time audio
- E.MOH
- Answer & Explanation
- Report
Answer : [A, B, C, D]
Explanation :
Explanation :
| Two- way, real- time videoconferencing over Wi- Fi will at least contain video, audio, and some type of call/session setup and teardown protocol. Many videoconferencing systems allow data to be transmitted to the other parties as well, such as presentation slides and other data. |
27.
What type of codec should be avoided using video over Wi - Fi?
- A.AVI
- B.QuickTime
- C.MPEG - 2
- D.MPEG - 3
- E.MPEG - 4
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| MPEG- 2 was not originally designed to be transported over a data network and has many negative attributes that result in poor quality relative to other codecs. |
28.
What are methods of providing RF high availability?
- A.Use the HSRP/VRRP protocol.
- B.Use dual spectrums.
- C.Deploy 802.3af.
- D.Power APs to maximum power.
- E.Deploy using 100 percent overlap.
- Answer & Explanation
- Report
Answer : [E]
Explanation :
Explanation :
| HSRP/VRRP is an IP networking failover feature. Dual spectrums will not provide RF redundancy if an entire AP would fail or clients only support one spectrum. 802.3af is only an alternative powering mechanism for APs. Increasing transmit power to fi ll in RF holes can fi ll in holes only if you are downlink - limited to begin with; unless client devices support the same maximum power (which is usually unlikely), it will not help. Deploying using 100 percent overlap would result in poor performance but would at least provide some level of RF redundancy. It is worth noting that some vendors provide proprietary mechanisms to failover standby APs if the active one were to fail. |
29.
What design considerations should you be concerned about when using 802.11 - based
multicast frames for real - time applications? (Choose all that apply.)
- A.Multicast frames are not acknowledged.
- B.802.11 multicast frames are sent using the lowest basic rate in the BSS.
- C.802.11 multicast frames are sent using the highest basic rate in the BSS.
- D.Delivery assurances for clients with power saving enabled
- E.Wired network co - dependency to enable multicast applications
- Answer & Explanation
- Report
Answer : [A, B, D, E]
Explanation :
Explanation :
| Using multicast over Wi - Fi networks for real - time applications requires a lot of attention to detail. Several infrastructure equipment manufacturers are currently developing enhancements to multicast traffi c delivery. |
30.
Left to its simplest form, what method does a location algorithm use to determine location
within a WLAN coverage area?
- A.Inverse cube law
- B.FSPL
- C.RF fingerprinting
- D.802.11 clause 16
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| The free space path loss (FSPL) propagation model is used to determine device location between APs within a coverage area. The question was based on the premise of using the simplest form. |
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