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

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

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Computer Networking
HDLC (High-level Data Link Control) is

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

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