Computer Science 825
                           Quiz 1           Name _______________________

Terminology:  the very highest layer is the APPLICATION LAYER
              the very lowest  layer is the PHYSICAL LAYER

Suggestion:   READ the questions carefully... some with minor
              changes in terminology from old quizzes have
              DIFFERENT ANSWERS from their counterparts.

1. What is the highest layer that must be implemented in every
   IMP in a store and forward network.




2. What is the lowest layer which is normally present in hosts
   but not in IMP's.



3. Protocol headers used by a layer N are handled by layer K (K > N)
   as follows:

   a. The are removed before  b. They are treated as user data.
      the packet arrives at
      Layer K

   c. They are deleted by layer K.


4. A Layer N service definition is most closely related to specifying
   the way in which layer N interacts with:

   a. Layer N - 1                b. Layer N + 1

   c. Layer N at other nodes
      in the network.


5. A Layer N protocol definition is most closely related to specifying
   the way in which layer N interacts with:

   a. Layer N - 1                b. Layer N + 1   c. Layer N at other nodes
      in the network.


6. Which two layers does the TCP / IP network architecture specify

   a. Data Link and Physical     b. Application and Transport

   c. Network and Transport      d. None of the above


Turn page over... there's more fun on the back!

7. Identify the form of Transport service best suited for the
   following applications:

   ___ a. Very large file   a. unreliable connectionless
          transfers
                            b. reliable connection oriented
   ___ b. Audio & Video
          teleconferencing  c. reliable connection less.

   ___ c. Electronic mail   d. unreliable connection
                               oriented.



8. At which layer is it most necessary that a common protocol
    be implemented within all nodes of a network.