Computer Networking
What does a VLAN do?

Provides multiple broadcast domains within a single collision domain.
Provides multiple collision domains on one switch port.
Acts as the fastest port to all servers.
Breaks up broadcast domains in a layer 2 switch internetwork.

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Computer Networking
The main difference between synchronous and asynchronous transmission is

the clocking is mixed with the data in asynchronous transmission
the clocking is derived from the data in synchronous transmission
the bandwidth required is different
the pulse height is different.
None of these

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