Homework 6

Question 1 - IP Subnetting

An organization has a class C network 196.10.10 and wants to form subnets for five departments, which host as follows:

  1. 55 hosts
  2. 50 hosts
  3. 45 hosts
  4. 25 hosts
  5. 20 hosts
There are 195 hosts in all. Design a possible arrangement of subnets to make each department in a different subnet. For each subnet, give subnet mask and range of IP addresses.

Question 2 - Bridging

  1. Consider the arrangement of learning bridges shown in the following figure. Assuming all are initially empty, give the forwarding tables for each of the bridges B1-B4 after the following transmissions:

    D sends to C; A sends to D; C sends to A
  • Bridged Network:

Question 3 - IP Fragmentation

Suppose a TCP message that contains 2048 bytes of data and 20 bytes of TCP header is passed to IP for delivery across two networks of the Internet. The first network uses 14 byte headers and has a MTU of 1024 bytes; the second uses 8-byte headers with an MTU of 512 bytes. Each network’s MTU gives the size of the largest IP datagram that can be carried in a link-layer frame. Give the sizes and offsets of the sequence of fragments delivered to the network layer at the destination host. Assume all IP headers are 20 bytes. Note, the IP requires that fragmentation should always happen on 8-byte boundaries.

Solutions *

Topic attachments
I Attachment Action Size Date Who Comment
Pngpng Bridges.png manage 9.5 K 2013-11-07 - 12:27 JimSkon Bridged Network
Topic revision: r2 - 2013-11-12 - JimSkon
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