When light (or electrical signals) travels in a guided medium 
its speed is ~
  the same as in free space~
  less than in free space~
  greater than in free space
~~
What is the usual cause of queueing delay in packet switched networks?~
  More than one packet is ready to be sent on a link at a given time~
  Links break down and can't be used for awhile~
  Packets have to traverse multiple links to get to their destination~
  Some packets are more important than other packets and go to the head of the line
~~ 
You have a petabyte (10^12 bytes) of data to send from New York to Los Angeles. What
is your first impression about the following question: Should you ~
 Write the data to 1000 disk drives each holding at terabye (10^9), load them in a van, and drive? ~
 Send the data over the Internet?