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greatly extend battery life by configuring your WLAN stations to wait for longer periods before waking, this will also degrade the performance of the WLAN Equally, when you have the stations wake more frequently, you lessen the length of time in which the stations can operate on battery power The balance is usually found by considering the use of the stations and then setting the power management capabilities accordingly For example, if you are using a laptop for VoIP communications, you may want to lean more toward performance and further away from battery conservation On the other hand, if you are using a laptop strictly for e-mail and web browsing, you will likely lean in the opposite direction
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This chapter provided you with an overview of the WLAN topologies and architectures that are available to today s WLAN engineer Additionally, you learned about the power management capabilities of wireless stations in an 80211 WLAN
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Advanced Wireless LAN Models
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Define WLAN Architectures
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Distributed WLANs use autonomous APs Centralized WLANs use lightweight APs Multiple-channel architecture (MCA) uses traditional cell-sizing deployment
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Single-channel architecture (SCA) uses proprietary algorithms to avoid
co-channel interference
MCA implementations require more time for site surveys and network planning SCA implementations may require the purchase of more hardware, which
results in overengineering
MCA implementations can be finely controlled, but they will require
ongoing tweaking as the environment changes
SCA implementations are controlled algorithmically, but they are
self-adjusting to environmental changes
MCA WLANs suffer from more co-channel interference than most
SCA WLANs
The throughput-per-AP ratio is better for a well-designed MCA WLAN than
for an SCA WLAN
Wireless Mesh Access Layers
Mesh wireless access layers use APs that communicate with both clients and
the infrastructure using the wireless medium
The backhaul and the client services run across the wireless medium Mesh wireless provides greater redundancy When multiple mesh hops exist between the clients and the infrastructure,
delays may be too great for real-time technologies such as VoIP or live media streaming
Like SCA, mesh access layers require less planning, because the communication
routers are built dynamically among the mesh APs
Self Test
SELF TEST
The following questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully because there might be more than one correct answer Choose all correct answers for each question
Define WLAN Architectures
1 What kind of WLANs use thick or fat APs A Distributed B Centralized C SCA D Next generation 2 A wireless technology professional is calculating cell sizes for a WLAN deployment What kind of architecture is she most likely prepping for A SCA B MCA C Mesh D WiMAX 3 Which of the following are potentially negative aspects of MCA implementations (Choose two) A Longer site survey times B Shorter site survey times C More ongoing maintenance D Extensive overengineering 4 Which of the following are potentially positive aspects of MCA implementations (Choose two) A Greater control for the engineer B Shorter site survey times C Less overengineering D Improved security 5 Which one of the following is not a potentially negative aspect of SCA implementations A More overengineering is possible B Site surveys take longer C Less control is given to the engineer D More APs may be required
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6 What is a benefit of the SCA solutions provided by many vendors A More control is given to the engineer B Site survey time is greatly reduced C Fewer APs are needed to cover the same area as MCA D SCA is more standards-based than MCA 7 What kind of APs are used on centralized WLANs A Lightweight B Thick C Fat D Autonomous 8 What functions are performed by the APs in most SCA implementations A Simple radio functions B The entire 80211 MAC layer functions C 75 to 80 percent of the 80211 MAC layer functions D Only Network layer functions 9 How many non-overlapping channels exist in the 24 GHz spectrum used by 80211 A 1 B 3 C 5 D 56 10 Why can you place more 80211a APs than 80211g APs in the same area without causing co-channel interference A Because 80211g APs provide more non-overlapping channels B Because 80211g APs provide shorter communication time slices C Because 80211a APs provide shorter communication time slices D Because 80211a APs provide more non-overlapping channels 11 Why do MCA implementations use hexagons to represent the coverage patterns of AP and antenna pairs A Because AP/antenna pairs create coverage cells in exact hexagonal patterns B Because they work well for representation in diagrams C Because the engineer enabled the Use Hex-Radiation setting in the APs D Because SCA radiates in a star pattern
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