Computer Science 360
                                 Quiz  I             Name___________________


Suppose MSS = 1000 bytes, cwnd = 10000, snd.seq = 18000, snd.una = 12000
and the offered window is 32000.

1. If the segment that has sequence 12000 was actually lost, give the
   starting sequence numbers of the remaining 1000 byte segments that
   the sender can send before having to stop. (Hint: all sequence numbers
   end in 000)






2. Suppose that the sender has stopped when the 3rd duplicate
   ack arrives. What does the receipt of the third duplicate ack
   cause ssthresh and cwnd be set to (in BYTES)

       ssthresh =


       cwnd  =



3. How many additional duplicate acks will have to be received
   before a NEW segment can be sent.






4. Assuming that ONLY the 12000 segment was lost what will be
   the first ACK for new data that is received) (Hint: the answer
   ends in 000)







5. What will be the leading edge of the congestion window when
   the first ack for new data is received (usual hint).