Swinburne University of Technology

Faculty of Information and

Communication Technologies

HIT2125Data Communications and Computer Networks

Network Case Study 2 - The Concept of IP Subnetting

(Document 13)

Semester 1, 2007

Sample Only

HIT2125Semester 1 2007

Network Case Study 2 - The Concept of IP Subnetting

The tutor keeps this sheet as record of completion

Due Date: By end of academic week 9.

Student Name: __________________________________________

Student Id: ____________________

Marks: 5 towards the Unit Result

You must demonstrate to your tutor that you have completed the case study

Tutor Name: ____________________________________________

Tutor Signature: _____________________ Date: _____________

HIT2125Semester 1 2007

Network Case Study 2 -The Concept of IP Subnetting

The student keeps this sheet

Student Name: __________________________________________

Student Id: ____________________

Marks: 5 towards the Unit Result

You must demonstrate to your tutor that you have completed the case study

Tutor Name: ____________________________________________

Tutor Signature: _____________________ Date: _____________

4

Packet Tracer V4.01

• A simulation product for the designing, and testing of a network before its implementation on the actual hardware devices.

5

Brisbane Router Adelaide Router

Bris_Hub Adel_Hub

Subnet 92Subnet 85

Network Address35.0.0.0/18

UTP Cable

Serial Cable

BrisPC

AdelPC

Network Case Study 2 – The Concept of IP Subnetting

Fa 0/0 Fa 0/0

S 2/0

S 2/0DCE

Subnet 152

Host 262 Host 520

6

Brisbane Router - Configuration

! The FastEthernet interface configuration:

interface fa 0/0ip address <replace with address> 255.255.192.0description Link to Brisbane Hub, Subnet 85no shutdown

! The Serial interface configuration:

interface serial 2/0ip address <replace with address> 255.255.192.0! This is DCE end of the linkclock rate 64000description Link to Adelaide Router, Subnet 152no shutdown

! Set hostname of the router

hostname Brisbane

7

Brisbane PC - Configuration

• Set the PC’s IP address to address of Host 262

• Set PC’s subnet mask to 255.255.192.0

• Set PC’s gateway IP address

8

Adelaide Router - Configuration

! The FastEthernet interface configuration:

interface fa 0/0ip address <replace with address> 255.255.192.0description Link to Adelaide Hub, Subnet 92no shutdown

! The Serial interface configuration:

interface serial 2/0ip address <replace with address> 255.255.192.0description Link to Brisbane Router, Subnet 152no shutdown

! Set hostname of the router

hostname Adelaide

9

Adelaide PC - Configuration

• Set the PC’s IP address to address of Host 262

• Set the PC’s subnet mask to 255.255.192.0

• Set the PC’s gateway IP address

10

Link (Point-to-Point) Testing

• Use the ping command to test each link is working

• Note you cannot ping from the Brisbane PC to the Adelaide PC, Why is this the case?

11

Routing Protocols

Brisbane Router

router rip

version 2

no auto-summary

network <replace with network address>

Adelaide Router

router rip

version 2

no auto-summary

network <replace with network address>

12

Path (End-to-End) Testing

• Use the ping, and traceroute commands to test a path exists between the Brisbane PC and the Adelaide PC

• If a path exists, Why is this the case?

13

Discussion Points

• Concept of IP Subnetting

– IP Address Classes

– Classful Address

– Two Level Classful Hierarchy• Network-Prefix, Host-Number• Routing tables growing in size• Local administrators had to request another

network number, before a new network could be installed at their site

14

Discussion Points

• Concept of IP Subnetting

– Three Level Subnet Hierarchy• Network Prefix, Subnet-Number, Host-Number• Subnet structure not visible to external Internet• The routers within the internal network need to

differentiate between individual subnets• Internet routers, all subnets within internal

networks collected into a single routing table entry• Route Flapping

– Subnet Address Mask

15

Discussion Points

• Router IOS Modes– User Executive– Privileged Executive – Global Configuration– Interface Configuration– Router Configuration

• System Testing and Trouble Shooting– Step by Step Testing– Link (Point-to-Point) Testing– Path (End-to-End) Testing– Use of show commands– Use of debug commands

16

Useful Router Commands

• show ip route• show ip protocol• show running-configure• show version• show ip interface brief• show cdp neighbors• show controllers serial <replace with interface> • show interface serial <replace with interface>• show interface ethernet <replace with interface>• debug ip rip• debug ip packet detail

• no debug all