Computer Science 826
                         Quiz B           Name _______________________


1. Consider the MIB data shown on the board.  Which of the following
   object hierarchies is correct:

   a. at.atTable.atEntry             b. atEntry.atTable.at

   c. at.atEntry.atTable             d. atTable.atEntry.at

2. What elements are used as "subscripts" in the table of
   atEntrys





3. In retrieve a single, specific  element of the atEntry table
   using the "snmpget" (not walk or get next) mechanism what two
   specific items of information relating to the entry must you
   already KNOW before you can build your query?





4. Suppose a host has two interfaces, interface 2 and interface 3.
   Suppose both entries presently have 3 entries in their respective
   arp caches. How many lines of output will be generated by:

   snmpwalk hostname public at.atTable



5. ATM service is

   a. connection oriented and        b. connection oriented and
      unreliable                        reliable

   c. connection less and            d. connection less and
      unreliable                        unreliable

6. The AAL used for carrying IP data is

   a. AAL1                           b. AAL2

   c. AAL3/4                         d. AAL5

7. Which of the following evils is ATM service guaranteed not to
   do.

   a. Lose cells                     b. Deliver cells in an order
                                        different from the order in
                                        which they were transmitted.

   c. Corrupt a few bits in
      a cell.



8. The segmentation of AAL5 frames into cells for transmission
   and the reassembly into frames upon receipt is typically
   performed:

   a. In the IP layer                b. By the device driver

   c. In hardware by the
      ATM adapter.


9. We identified two ways in which it was possible to determine
   that a cell had been lost from an AAL5 frame. What were they?

   a -


   b -


10. Routing of the cells belonging to an established connection
    from switch to switch in an atm network is based upon:

   a. The ATM address of the      b. The connection identifier
      destination host               (vpi, vci)

   c. A combination of (a.)
      and (b.)

11. The actual values used for (vpi,vci) are

    a. Constant for any given          b. May vary between
       connection                         switches

12. The desirability of using large AAL5 frame sizes for TCP/IP over
    ATM on a given ATM connection

    a. Increases as cell loss          b. Decreases as cell loss
       probility increases                probability increases

    c. Is independent of cell
       loss probability