We give only a high-level, intuitive discussion of queuing delay here
the traffic intensity often plays an important role in estimating the extent of the queuing delay
Let’s also suppose for the moment that the network is uncon- gested (so that queuing delays are negligible)
These illusions are provided by the notion of a process, one of the most important and successful ideas in computer science.
The operating system performs this interleaving with a mechanism known as context switching.
The notion of a shared library is a powerful but somewhat difficult concept.