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The port separation function restricts communications between ports on a LAN interface incorporating a switching hub.
LAN interfaces with switching hubs can be used virtually as multiple LAN interfaces.
A VLAN (virtual LAN) is not depended to physical connection situation and is regarded as one LAN with making virtual group.
For interfaces of routers such as LAN interface and PP interface is allocated from 1 depending on the number of implementations and the maximum number of each.
The bridge interface is a function that accommodates multiple interfaces in one virtual interface and bridges those interfaces.
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