Computer Networking
What is the main reason the OSI model was created?

So application developers can change only one layer's protocols at a time.
So Cisco could use the model.
To create a layered model larger than the DoD model.
So different networks could communicate.

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

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

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