Computer  Science 826
                         Quiz C           Name _______________________

1. 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


2. We went through an example program that illustrated 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.


3. When an application calls the resolver library, the resolver
   typically transmits the query:

   a. directly to one of the              b. to a local nameserver
      root name servers.

   c. to the nameserver that owns the
      name to be resolved.


4. In most implementations of DNS, local caching of names is done:

   a. By the resolver.                    b. By the local nameserver

   c. By both the resolver
      and the local nameserver            d. Not at all.


5. What type of RR's would be expected from a non-recursive type "A"
   query to a Root NS for www.info.billgates.ee (Hint: possible
   answers include: "answers" "authority(nameserver)" "additional info")




6. What SPECIFIC information is conveyed in the "additional info"
   resource records?





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

   a. Iterative -









   b. Recursive -








8. What name would be queried in a PTR request for the host whose
   IP address was 192.174.15.1?







9. A trailing .0 in an SNMP MIB item definition indicates:

   a. This is the last item in       b. The item has a value of 0
      this level of the tree

   c. The item is a scalar as
      opposed to an array.


10. The SNMP message used by an agent to inform a manager
    of an unusual event is called a:

    a. set response                  b. trap

    c. signal                        d. community