TDC 375-701                   Student Name:
Quiz 3
2009-09-30


1. The TTL field in an IPv4 header

   ___  is a 8-bit field that increments when traversing a router

   _x_  is a 8-bit field that decrements when traversing a router

   ___  is a 16-bit field that increments when traversing a router

   ___  is a 16-bit field that decrements when traversing a router



2. Assume a host has the IPv4 address 140.192.2.255 and is on a /23
   subnet.  It sends a packet to a destination host with address
   140.192.0.1.  Does the packet have to travel through a router or
   can it go directly?

   ___ Direct

   _x_ Indirect (has to traverse a router)

   ___ The source address is invalid



3. Which protocol, sometimes called a layer 2 1/2 protocol, is commonly
   used for "traffic engineering" by large ISPs and telcos as discussed
   in our last class?


   _MPLS_______________________________________________




4. Which fields in an IPv4 header are likely to change across a set
   of fragments for a single IP datagram (check all that apply)?

   _x_ fragmentation offset

   ___ destination address

   ___ protocol

   ___ identification

   _x_ header checksum

   _x_ total length



5. Match the IPv4 header field name to its size in bits (some
   values may be used more than once):

   bit field lengths: 3, 4, 8, 13, 16, 32

   4__ header length

   16_ total length

   16_ identification

   3__ flags

   13_ fragmentation offset

   8__ TTL

   8__ protocol

   16_ header checksum

   32_ source address

   32_ destination address


$Id: quiz3.txt,v 1.3 2009/10/01 05:40:27 jtk Exp $