TDC 375-701                   Student Name:
Quiz 4
2009-08-21


1. If your destination is 192.0.2.1, which would be the best BGP
   route given the following information?  Circle the best answer.

     prefix        AS path (next-as --> origin AS)

     192.0.0.0/8   [ 65000 65001 65002 65000 ]

    (192.0.2.0/24  [ 65100 65101 65102 65103 65000 ])

     192.0.0.0/22  [ 65200 65201 65004 ]

     0.0.0.0/0     [ 65501 65500 ]
 

2. Associate each routing algorithm with the common implementation.
   Some routing algorithms are associated with more than one common
   implementation.  Write the appropriate letter in the space
   provided.

   a. Distance Vector (aka Bellman-Ford)
   b. Link-state (Djistrka)
   c. Path-vector

   _a_ RIPv2

   _c_ BGP

   _b_ OSPF

   _a_ RIP

   _b_ IS-IS



3. As used with BGP routing, ASN stands for ... (circle best answer)

   a.  Aggregated Static Networks

   b.  Autonomous Static Networks

  (c.) Autonomous System Number

   d.  Abstract Syntax Notation

   e.  Aggregated System Notation


4. In the Randy Bush IETF video in the last class, what was major
   reason shown for the growth in routing table size?

  (a.) Small, edge network multi-homing

   b.  Growth and expansion of Google

   c.  ISP backbone router operator misconfiguration

   d.  BGP implementation bugs in routers

   e.  Increased utilization of IPv6


5. Assume a host with address 192.0.2.1 is configured with a subnet
   mask of 255.255.255.128 and the default router for that network
   has the address 192.0.2.56 with subnet mask 255.255.255.0.  That
   is, the end host has a misconfigured network mask for the network.
   Assuming the router and connectivity to other networks is fine,
   will the end host at 192.0.2.1 be able to talk to 140.192.1.6?
   (yes or no, but explain if you want to)

   Yes, that will work fine.  Even though the mask is wrong for
   its own subnet, the router is within the smaller, incorrect
   /25, so it will be able to reach it and it will know that the
   destination host needs to be sent through a router.

   bonus question: What will happen when the host tries to talk
   to a host with the destination address of 192.0.2.254?

   It will think its on a different subnet and will have to traverse
   a router so it'll send packets to its default gateway, which will
   relay them back onto the subnet to the intended host.  This is
   suboptimal of course, but it will work.  If the router has ICMP
   redirects enabled it may send redirects to the originating host.

$Id: quiz4.txt,v 1.2 2009/10/22 03:55:48 jtk Exp $