Computer  Science 826
                        Quiz 5  -     Name ________________________

 1. We discussed reasons why constructing an efficient and reliable
    transport protocols above IP is more difficult than constructing an
    efficient and reliable point-to-point datalink protocol.
    Identify two of them:

    1 -


    2 -

 2. The TCP protocol is a transport protocol that is

    a. Connection-less and         b. Connection-less and reliable.
      unreliable.

    c. Connection-oriented and     d. Connection-oriented and reliable.
       unreliable.

 3. Functions that TCP must perform include

    a. Detect and discard          b. Reorder data that is received
       duplicated data                out of order

     c. Both of the above.          d. Neither of the above.

Suppose a 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

 4. A delayed duplicate SYN1 received in the CLOSED / LISTEN state is

    a. detected because of wrong  b. Detected because of wrong ACK
       SEQ number.                   number.

    c. Undetected and responded   d. Responded to with a SYN 1.
       to with a SYN2.

 5. A delayed duplicate SYN1 received the SYN sent state is:

    a. Detected because the       b. Detected because SYN1 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

 6. A delayed duplicate SYN2 received the SYN sent state is:

    a. Detected because the       b. Detected because SYN1 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

 7. A delayed duplicate SYN1 received in the ESTABLISHED state is:

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

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


 8. The sequence of states through which a client passes when a client
    initiates a close is:

    a. Close-wait, last-ack,      b. Fin-Wait-1, Closing, Time-Wait
       Closed                        Closed

    c. Fin-Wait-1, Fin-wait-2     d. Close-Wait, Last-Ack, Closed
       Time-wait, Closed

 9. The sending of a packet with the "FIN" bit set indicates that

    a. No more data will be        b. No more data will be
       sent                           received

    c. both a. and b.

10. Which is the state that is passed through only when both
    ends of the connection are simulaneously closed

    a. Close-wait                b. Last-ack

    c. Closed                    d. Closing

11. For each of the following states answer "T" if the state is
    Transient (normally lasts only about a round trip transmission
    time) or "P" if the state is "Persistent" (can last an arbitrarily
    long time).

    ____ a. Fin-Wait-1

    ____ b. Closing

    ____ c. Last-Ack