2.3
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Main features
2.3.1
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Wireless Network Connection
2.3.1.1
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Network Topology
Wifi wireless network includes two types of topology: basic network (Infrastructure),
and adhoc networks (Adhoc).to explain the wireless network topology, two basic concepts
are needed to be understood first ,
AP, that is the wireless access point, the founder of a wireless network and the center
of the network nodes. The wireless router we use at home or in office may be an AP.
STA, short for station, each terminal connects to a wireless network(such as laptops,
PDA and other networking devices) can be called with a STA devices.
Basic wireless network based on AP(Infrastructure)
Infrastructure:it’s also called basic network.It’s built by AP and many STAs which join in.
The characters of network of this type is that AP is the center,and all communication is
transmitted through the AP .
figure2-6 Infrastructure topology
wireless network based on ad hoc network (Adhoc)
Adhoc
：
it’s also called independent basic service set,and it’s built by two or more STAs
without AP, this type of network is a loose structure, all the STAs in the network can
communicate directly.
