cse123A  Computer Networks
         
         Final Exam, Thursday  DEC 16,  CENTR 212, 3pm to 5.15pm
         
         ch 1 - sec 1.1 to 1.4, ch 2 - discussion problems
         ch 3 - sec 3.1 to 3.4, ch 4 - sec 4.1 to 4.4,
         ch 5 - sec 5.1 to 5.5, ch 6 - sec 6.1 to 6.4 and 6.6
         are included.
         
         The cover page of the Final question paper may be seen.
         This gives the number of questions and marks for them.
         
         Questions are of two kinds - problems like in QUIZ I/QUIZ II, and
         questions which require a short/brief answer in few lines 
         (Two examples of this kind are)
         
         Question:
         
         TCP and UDP are both transport layer protocols.
         What is the main difference between TCP and UDP? 
         
         Answer:
         
         TCP is connection oriented and reliable. UDP is connectioness
         and unreliable. 
         
         Question:
         
         Is TCP segment encapsulated in IP packet or the otherway around?
         
         Answer:
         
         TCP segment is encapsulated in IP packet.
         
         FIRST PAGE OF THE FINAL EXAM QUESTION PAPER IS:
         -----------------------------------------------
         
         
                      cse123A Computer Networks    Fall 99  Final
		      -------------------------------------------

		      Thursday, December 16, 3pm to 5.15pm CENTR 212

				    
				  
        Name:(please print)

        ucsd id No.


        Answer all questions. Exam is closed book.

	Write your answers in the space indicated and provided for with each
	question.

	Write legibly.  Avoid Overwriting.  Write with pen only.  Do not write
	on the reverse side.

	Keep rough work separate and do not submit it. Rough work not
	evaluated.  For rough work separate blank sheets are provided.


        Q. No.  marks         Q.No.   marks     Q.No.   marks   Q.No.  marks
        --------------        -------------     -------------   ------------
          1       5            10       1        20       1      30      2  

          2       3            11       4        21       2      31     10

          3       9            12       6        22       2      32      4

          4       5            13       2        23       1      33      2

          5       3            14       2        24      1+2     34      3
 
          6a      1            15       2        25       1

          6b      2            16       2        26       3

          7      15            17       2        27       3

          8       1            18       1        28       1

          9       2            19       2        29       1
          
         ----------------------------------------------------------------------
         
                                     Total (out of 109) : 
                                     
                                     
                                     
                                                              PAGE 1
            
            
                  (there are 17 pages - PAGE 1 to PAGE 17) 
                  
                  
   -----------------------------------------------------------                  
  |                                                           | 
  | The distribution of the questions is roughly as follows:  |
  |                                                           |
  | datalink layer - 4 questions (marks 11)                   |
  |                                                           |
  | mac layer -  8 questions (marks 21)                       |
  |                                                           |
  | network/transport layer - 19 questions (marks 60)         |
  |                                                           |
  | general -  3 questions (marks 17)                         |
  |                                                           |
   ------------------------------------------------------------