$1.$ What is the transmission medium that provides speed?

$2.$ Which of the following statement about networking is NOT true? Choose one answer.

$($a$).$ Cost is important

$($b$).$ Computer networks are fundamentally reliable

$($c$).$ Network performance is proportional to cost

$($d$).$ The internet layer is also called Layer $3$

$($e$).$ Both $($b$)$ and $($c$)$

$3.$ Where are the customer lines terminated?

$($a$).CO$

$($b$).$ CPE

$($c$).$ ISP

$($d$).$ NAP

$($e$).$ NSP

$($f$).$ POP

$4.$ Enterprise customers usually require their networking products be up and running at least $99\mathrm{.}999\%.$How many minutes can a router be unavailable for any reason in one year?