Computer Science 881
                         Quiz 7           Name _______________________

1. Which of the following is NOT a reason put forth by telephone
   companies to convince you that it is not possible to do multimedia
   teleconferencing over IP.

   a. Connectionless transports can't   b. IP's occasional packet loss
      reserve bandwidth and thus           is fatal for audio conferencing
      can't guarantee service levels.

   c. Even when throughput is adequate
      IP's high response time variance
      make its use unsuitable.

2. Which of the following is NOT a reason put forth by IP bigots
   to convince you that it is not possible to do multimedia
   teleconferencing over the telephone.

   a. Its generally hard to join a    b.The number of required connections
      conference call already in        scales as N^2 where N is the
      progress.                         number of participants.

   c. The bit error rates of ATM/
      Sonet links are too high.


3. What are the two elements of the structure passed to setsockopt
   when IP_ADDMEMBERSHIP is requested.

   a.


   b.


4. If a multicast is to be transmitted and received by different
   processes on a single machine an additional setsockopt call must
   be made. What does this one do?





5. The transport used in a muliticast is:

   a. UDP                             b. TCP

   c. both are equally applicable     d. MTP (multicast transport protocol)

6. The number of possible IP multicast addresses PER ethernet hardware
   level multicast address is closest to:

   a. 1 / 32                          b. 5

   c. 2^ 20                           d. 32


7. For multicast to be able to work correctly, a protocol like IGMP
   is needed on:

   a. A single isolated ethernet     b. Two distinct networks connected
                                        by an IGMP capable router.

   c. An isolated host.              d. All of the above.


8. When an IGMP query membership is sent to all hosts, only
   a single reply may have to be transmitted per group... even
   when the group has a large number of members.  Explain
   PRECISELY how this can be accomplished.






9. What is the primary advantage of the use of IGMP query as
   opposed to keeping track of membership based on "Exit group"
   messages generated by a host when its last member leaves
   a group.







10. The routing protocol underlying the global "MBONE" is:

   a. MOSPF                        b. BGP

   c. DVMRP                        d. IGMP

11. The primary name server for a given zone acquires the name
    data describing the systems within its zone of responsibility:

    a. From an Ascii file maintained     b. Dynamically from each host
       within the zone by a sys admin.      system within the zone.

    c. By a zone transfer from the root  d. From a database maintained
       name server for the domain.          by the Internic.

12. The DNS name server with responsibility for a zone such as
    .eng.clemson.edu must know the IP addresses of:

    a. At least one root nameserver      b. name servers for sub-zones
                                            (.parl.eng.clemson.edu)

    c. The nameserver for the            d. a. and b. but not c.
       parent zone (.clemson.edu)
                                         e. a., b., and c.

13. Before DNS was "invented" how were names resolved to IP addresses
    in the internet?  What were the main problems with this scheme?