Computer Science 360
                                 Quiz  C             Name___________________

The following questions assume a simplex connection in which one endpoint
acts as a sender of data and the other acts as receiver.

1. The seq number carried in a packet will

   a. increase on packets going from    b. increase on packets going from
      sender to receiver but stay the      receiver to sender but stay the
      same on packets going from           same on packets going from
      receiver to sender                   sender to receiver

   c. increase on packets flowing in    d. Not change on packets flowing
      both directions                      in both directions.

2. The ack number carried in a packet will

   a. increase on packets going from    b. increase on packets going from
      sender to receiver but stay the      receiver to sender but stay the
      same on packets going from           same on packets going from
      receiver to sender                   sender to receiver

   c. increase on packets flowing in    d. Not change on packets flowing
      both directions                      in both directions.

3. Slots in the sender send ring will be returned to the free slot set

   a. as soon as the packet has been    b. during ack processing by the
      transmitted by the sender thread     sender thread.


   c. during ack processing by the      d. during rps_write() calls in the
      receiver thread                      main thread.


4. Suppose an ACK packet arrives at the sender with  ACK=7,WIN=5

   a.  How many free slots were there in the receiver's receive ring
       at the time the packet was sent?




   b.  When the sender receives the ACK suppose nxtsnd=9.  How many
       MORE packets can't be sent before the sender must stop and
       wait for a new ack.