Computer  Science 481/681
                        Quiz 5  -         Name ________________________

1. Which of the following is NOT claimed as an advantage of PPP
   over CSLIP.

   a. It provides a better         b. It supports dynamic negotiation
      error detection capability      of IP addresses

   c. It is much more efficient    d. It supports multiple protocols
                                      (not just TCP/IP) on a single
                                      serial line.

2. Suppose the byte sequence 0x7D 0x53 0x7D 0x77  is transmitted
                              1st           last
   on a PPP link. What byte values will be passed to the NETWORK layer?




3. From the Internet's point of view which of the following is
   best characterized as an Autonomous System (AS)

   a. All systems on the CS dept      b. All systems in the CS dept
      subnet 130.127.70

   c. All Clemson University systems  d. None of the above
      on the network 130.127

5. Exterior gateway protocols (EGP's) are used for transmitting
   routing data:

   a. Within end user autonomous      b. Within backbone autonomous
      systems.                           systems.

   c. Across autonomous system        d. Both b. and c.
      boundaries.


6. RIP routing data is transported by

   a. ICMP                            b. TCP

   c. UDP                             d. IP header options

7. Approaches used by RIP to address its inherent limitations
   are called "split horizon", "poisoned reverse", and triggered updates.
   For each select the best description..

   ___ a. Split horizon             1. A RIP router should cease sending
                                       routing updates when any link fails
   ___ b. Triggered updates         2. A RIP router should advertised
                                       failed routes with a cost of 16
   ___ c. Poisoned reverse          3. A RIP router should not advertise
                                       routes to the router from which it
                                       learned them.
                                    4. A RIP router should generate a routing
                                       update whenever a cost changes.
                                    5. A RIP router should advertise only
                                       those routes not passing through itself.

8. During RIP packet exchanges a RIP router can expect to receive
   routing update packets (NOT INDIRECTLY DELIVERED INFORMATION) from:

   a. All other routers in its     b. Only from directly attached
      AS                              routers

   c. All other routers in the     d. All other routers in the internet
      Internet.                       that run RIP.


9. The objective of "triggered updates" is to

    a. Avoid the count to           b. Speed up the count to
       infinity.                       infinity.

    c. Ensure that links
       don't fail.

10. Consider the two networks shown on the board.  The use of split
    horizon with poisoned reverse eliminates the count to infinity
    problem in

    a. Net (1) but not Net (2)      b. Net (2) but not Net(1)

    c. Both                         d. Neither one.


11. Suppose split horizon without poisoned reverse is used in Net (2).
    F will advertise a route to A in routing updates F sends to B

    a. Always                       b. Never

    c. Within  a couple of
       exchanges after the
       A-B connection fails.