Computer  Science 826
                        Quiz A  -         Name ________________________


 1. The transport used by BGP is:

   a. IP packets with a private           b. ICMP
      protocol number

   c. UPD                                 d. TCP

 2. The transport used by SNMP is:

   a. IP packets with a private           b. ICMP
      protocol number

   c. UPD                                 d. TCP

The next few questions apply to the discussion that we had in class
about exchange of reachability information in EGP and BGP.

We identified two possible strategies that could be used by
an EGP router when it received an "I can reach network N" message
from neighboring AS "A"

   Strategy 1: If this is the first such message pertaining to network
               "N" add it to the routing table and propogate it. Else
               ignore and discard it.

   Strategy 2: Always use and propogate the most recently received
               "I can reach N" message -- replacing any existing
               information if it exists.

3. Which strategy is most likely to lead to routing loops:

   a. 1                          b.  2

   c. both equally likely        d.  neither

4. Which strategy provides a better capability to respond to
   changes in topology.


   a. 1                          b.  2

   c. both equally likely        d.  neither


5. BGP advertisements contain for each entity being advertised:

   a. A list of networks through     b. A list of AS's through
      which the path to the entity      which the path to the entity
      passes                            passes

   c. Both a. and b.                 d. No lists at all

6. The destination entity to which a route is advertised in BGP is:

   a. a destination AS               b. A destination Class A, B, or C
                                        network.

   c. A destination prefix/pfxlen

The next two question relate to Paxson's Paper:

7. The basic mechanism used by Paxson to detect routing pathologies
   was

   a. traceroute                       b. ping

   c. TCP connect requests             d. e-mail messages

8. In the D2 test 50 routing loops were discovered. These loops

   a. were mostly confined to          b. Almost always involved
      a single AS                         multiple AS's

   c. Were about equally split
      between the two categories.

9. The primary objective of CIDR is:

   a. Elminate routing loops         b. Reduce router table sizes

   c. Expand the size of the IP
      address space

10. Suppose a region of Europe was assigned a block of CIDR class
    C addresses in the range from 0xc3800000 to 0xc387ffff how many
    bits are associated with this prefix.






11. The "community name" in an SNMP get/set request

    a. Is used as a type of password   b. Identifies the collection
       to determine the scope of the      of objects that are being
       authority of the requestor         requested

    c. Indicates whether this is
       a get or set requests.


12. MIB Object identifiers and their values are "TLV" encoded by BER.
    What do T, L, and V represent?