Computer Networking
A 6-MHz channel is used by a digital signaling system utilizing 4-level signals. What is the maximum possible transmission rate?

6 Mband/sec
24 Mbaud/sec
None of these
12 Mbaud/sec
1.5 Mbaud/sec

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Computer Networking
The main difference between synchronous and asynchronous transmission is

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

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Computer Networking
The data-link layer, in reference to the OSI model, specifies

All of these
data link procedures that provide for the exchange of data via frames that can be sent and received
None of these
the virtual circuit interface to packet-switched service
the interface between the X.25 network and packet mode device

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