Suppose an enterprise's web traffic is routed through a proxy
cache server with average response time 0.1 and hit rate 40%, 
while accesses to the origin servers for web pages take 1 second.
What is the average response time seen by clients in the enterprise?
~~

In the previous problem, how much is the enterprise's external
traffic reduced?~
  60%~
  50%~
  40%~
  10%
~~

Which of the following is true?~
  GET requests cannot convey form data~
  POST requests convey form data in the URL part of the request~
  GET requests convey form data in the Entity Body part of the request~
  POST requests convey form data in the Entity Body part of the request
~~
A major advantage of HTTP/1.1 over HTTP/1.0 is~
  Persistent connections that allow multiple requests to the same server using a single connection~
  Faster retrieval of complex pages using multiple connections~
  Encrypted connections
~~
A mail user agent is a mail server~
  True~
  False
~~
The purpose of using mail servers in the Internet mail architecture is~
  Allow mail to be sent to a recipient who is currently off line~
  Ensure that the FBI can read any mail that you send~
  Implement a store-and-forward architecture~
  Allow mail to be stored for a long period of time