Computer Networking
The core diameter of a single-mode fibers is about

None of these
3 times the wavelength of the light carried in the fiber
10 times the fiber radius
10 times the wavelength of the light carried in the fiber
7 times the light carried in the fiber

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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 clocking is mixed with the data in asynchronous transmission
the bandwidth required is different
the pulse height is different.

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Computer Networking
MAC is

network access standard for connecting stations to a circuit-switched network
None of these
a method of determining which device has access to the transmission medium at any time
a method access control technique or multiple-access transmission media
a very common bit-oriented data link protocol issued to ISO.

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