Computer Networking
With an IP address set starting with 150, you currently have six offices that you are treating as subnets. Plans are in place to open 10 more offices before the end of the year. What subnet mask should you use to satisfy the needed number of subnets and maximize the number of hosts available at each site?

252
224
248
240
192

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Computer Networking
The difference between a multiplexer and a statistical multiplexer is

Multiplexers often waste the output link capacity while statistical multiplexers optimize its use
Statistical multiplexers need buffers while multiplexers do not need buffers
Multiplexers use Time Division Multiplexing (TDM) while statistical multiplexers use Frequency Division Multiplexing (FDM)
None of these
Multiplexer use X.25 protocol, while statistical multiplexers use the Aloha protocol

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Computer Networking
The main difference between synchronous and asynchronous transmission is

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

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