Computer Science 360
                                 Quiz  F             Name___________________

Suppose a TCP 3 way handshake is being used to establish a connection.
Let SYN1 represent a packet that carries SYN and no ack.
Let SYN2 represent a packet that carries both SYN and ACK that is
sent in response to a SYN1

1. A old delayed SYN2 received in the SYN sent state is:

   a. Detected because the       b. Detected because SYN2 is
      SEQ number is wrong.          unexpected in the SYN sent state

   c. Detected because the       d. Undetected and responded to
      ACK number is wrong.          with an SYN2

2. A old delayed SYN1 received in the LISTEN  state is:

   a. Detected because the       b. Detected because SYN1 is
      SEQ number is wrong.          unexpected in the LISTEN state

   c. Detected because the       d. Undetected and responded to
      ACK number is wrong.          with an SYN2

3. A old delayed SYN1 received in the ESTABLISHED state is:

   a. Responded to with RESET.   b. Responded to with an ACK packet
                                     specifying current ACK and SEQ.

   c. Responded to with SYN2     d. Responded to with SYN1.


4. Which of the  zones in in the diagram represents
   data that CAN be copied to TCP send buffers but CAN"T actually
   be sent yet:

          1         2          3          4       5
     ----------|----------|----------|--------|-------
            SND.UNA    SND.NXT    SND.UNA   SND.UNA
                                 +SND.WND   +SND.BUF

   a. 2                           b. 3

   c. 4                           d. 5

5.  Which of the zones in the diagram represents that data that has
    been ACKED but not yet consumed by the application.

       1          2          3        4
   ----------|----------|--------|---------
          RCV.APP    RCV.NXT   RCV.APP
                              +RCV.BUF

   a. 1                           b. 2

   c. 3                           d. 4