National Datacomm Corporation 0650S02 ユーザーズマニュアル

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  5
Wireless users have the same access to the network resources as they
would have if they were wired.  This type of network is usually used
to extend an existing network into a difficult to wire or a roaming
environment.
Figure 2.   AP to Wired Ethernet Bridge
Type 3. 
The third type of network is composed of multiple APs and multiple
Stations (Figure 3).  The APs could also be connected to servers on
the wired Ethernet network.  The shadowed area represents signal
overlap between subnet1 (AP-1) and subnet2 (AP-3).
Figure 3.   Multiple AP Network
The reasons for having multiple APs installed are:
1.  To increase bandwidth in order to boost overall network performance
2.  To extend the coverage range
Any other type of configuration is usually a mix of these commonly used types.
Server