Computer Science 481/681
                         Quiz A           Name _______________________

1. 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.

2. The data used to resolve PTR (gethostbyaddr) type requests is
   acquired:

   a. From Ascii files maintained        b. Dynamically from each host
      within each 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.
      in-addr.arpa

3. Associate the following DNS query types with the function for which
   it would normally be used:

   ___ 1.  PTR                        a. Get the internet address of
                                         a particular host.
   ___ 2.  HINFO                      b. Get the name of a particular
                                         host
   ___ 3.  MX                         c. Determine what types of services
                                         a particular host provides
   ___ 4.  WKS                        d. Determine what type of computer
                                         a particular host is.
                                      e. Determine alternate locations to
                                         which e-mail should be directed.

4. One type of entry that can be contained in a DNS packet are
   called "questions".  The other 3 entry types are generically
   called "resource records".

   Give the specific names of two of the three resource record types
   found in DNS responses.

   a -


   b -


5. Two types of query that are possible in DNS are "recursive"
   and "iterative". Describe how each approach works. USE A DIAGRAM
   to illustrate your discussion.

   a. Iterative -









   b. Recursive -








6. The public domain "host" utility program provides a mechanism for
   accessing the DNS through the resolver library.  To accomplish a
   "gethostbyname" function using the resolver library requires

   a. A single call that builds the       b. Three calls: one to build the
      query, sends it and receives           query, one to send it and one
      the answer.                            to receive the answer

   c. Two calls: one that builds and      d. Two calls: one that builds the
      sends the query and a second that      query and another that sends
      receives the answer.                   it and receives the answer.

7. 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.

8. 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.

9. The method used by TCP to deal with datagrams that are lost
   or damaged is:

   a. Simply accept the errors    b. Send a NAK packet explicitly
                                     requesting a retransmission

   c. Have the sender time-out    d. All of the above.
      and retransmit.

10. 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 -