Computer Science 881
                           Quiz 1            Name____________________

1. A protocol is called unreliable if it permits any of several
   problems to occur.  One is occasional loss of an entire data
   packet. Name two others.

   a.

   b.

2. We categorize protocols according to connection orientation
   and reliability.  Put IP, TCP, UDP, and ATM in the proper
   locations in the matrix shown below.

                    Reliable           Unreliable
   Connection                   |
   oriented                     |
                  --------------|------------------
   Connection                   |
   less                         |

3. Identify the network layer at which each of the following protocols
   resides.

   ___ a. IP               1. Link
                           2. Network
   ___ b. FTP              3. Transport
                           4. Application
   ___ c. UDP

   ___ d. ICMP

4. For ARP messages a link level broadcast is used:

   a. For the request but           b. For the reply
      not for the reply                but not for the request

   c. For the request and           d. For neither one.
      the reply

5. Associate the following IP  addresses with the appropriate class:


   ____ a. 170.9.1.100              1. Class C

   ____ b. 125.14.32.1              2. Local loopback

   ____ c. 127.0.0.1                3. Class B

   ____ d. 193.12.1.4               4. Multicast

   ____ e. 226.1.1.35               5. Class A

6. Identify TWO distinct benefits that can be derived from the
   use of GRATUITOUS Arp.

   a.



   b.


7. What is the subnet mask for a class B network in which 5 bits
   are used as a host address. (use standard "dotted-decimal" notation).

   a.


   b. Suppose my subnetwork mask is 255.255.240.0 and my host address
      is 130.127.48.1. Answer T or F depending upon whether each of
      the following is on the same subnetwork as me.

      ___ 1. 130.127.48.120

      ___ 2. 130.127.55.120

      ___ 3. 130.127.65.120

      ___ 4. 130.128.60.120


8. One entry type found in an IP routing table is a specific host address
   entry.  What are the other two?

   a.


   b.


   c. Which of the three types has the lowest priority?




9. Identify two DISTINCT types of messages of which the receipt
   should never result in generation of an ICMP error response.
   (We identified 5 in class.)

   a.



   b.

10. ICMP packets are

   a. Encapsulated in IP         b. Sent standalone without
      datagrams.                    even an ethernet header

   c. Have an ethernet header    d. Sent as a TCP packet.
      but no IP header.