A ____ is a data structure that looks like an upside-down tree.

Interface to the processor and memory via the system bus or central switch and interface to one or more peripheral devices by tailored data links are two major functions of an _____________.

Fill in the blank(s) with the appropriate word(s).

The complicated version of the loop instruction shows that the loop uses a counter variable named ___________________.

Fill in the blank(s) with the appropriate word(s).