If a certain event occurs every 20 milliseconds (ms) then how many times does it occur each second?~
  20~
  200~
  5000~
  500~
  50
~~
Network data rates are often described in terms such as Mbit/s, Kbit/s, Gbit/s. If a network's speed is given as 10 Mbit/s how long does it take to send 1000 bits?~
  100 milliseconds~
  1000 milliseconds~
  1000 microseconds~
  100 microseconds~
  0.1 milliseconds
~~
Signal propagation speed is usually expressed in terms of m/s or km/s. What is the speed of light in a vacuum?~
   186000 km/s~
   300000 km/s~
   300000 m/s~
   186000 ft/s
~~
In wires or optical fibers signals travel slower than in a vacuum, and we often use 200,000 km/s as a
rough estimate. Using this estimate how long does it take a signal to travel 5,000 km (approximately
the distance across the US)?~25ms