Uccn1003 -may10_-_lect02b1_-_lan_basic_in_packet_tracer

UCCN 1003 (May 2010)

Data Communications & Networks
(Lecture 02b)

Local Area Network (LAN) basics
in Packet Tracer 1

Introduction
• Packet Tracer 5.3
– is the latest version of Cisco Networking Academy’s
networking technology teaching and learning software.
– help instructors to create their own virtual “network
worlds” for exploration, experimentation, and
explanation of networking concepts and technologies.
– help students to visualize how the networks function.
– help students to design, configure and troubleshoot
virtual networks that are comparable to the real world.
– is available free of charge to all Networking Academy
instructors, students, and alumni.

Building your first LAN
in Packet Tracer

Your first guide on Packet Tracer
Forming a simple LAN
step by step

When you Open Your Packet Tracer

Workspace

Network Components
Specific Models

Network Components
• Network components in Packet Tracer 5.3

Hubs
Routers Wireless
Devices
Switches

End Devices Multiuser
Connection (cables)
WAN Emulation Custom made Connections
Devices

Switch

1.Click here first 2. Left click on “2950-24”
to get “Switches” and drag this switch into workspace

2950-24 Switch
• Network Switches are used to form a simple local area
network (LAN)
• Cisco Catalyst 2950-24
– have 24 10M/100M ports
• The port here (hardware) is different from “port number” (software)
• 10M = 10Mbps, 100M = 100 Mega bits per second (Mbps)
• 100M is what we call “Fast Ethernet”
• 10M is what we call “Ethernet”

Each of the switch ports is named as
fa0/1, fa0/2,….fa0/24

switch ports

PC

1.Click here first
to get “End Devices”
2. Drag two “Generic” PCs in workspace

Connection - 1

1.Click here first
to get Connections 2. Click on
“Automatically Choose Connection Type”

Connection - 2
• Click on both PC0 and Switch0 to form a connection.
• Do the same to connect a cable for PC1 and Switch0

4. Click on Switch0
3. Click on PC0

Connection - 3
• Wait for the little orange bubble to turn green.

Green bubble (communication is ready)

Orange bubble
(communication is not ready)

Configuring the PC - 1
• Double click on PC0 to call out the PC0 window

1. Double click on PC0
3. Click on
Desktop

2. This window will
Appear.


4. Click on
IP Configuration


9. Press this to close the
PC0 window

IP Configuration window

5. Enter 192.168.1.1

6. Press Tab key

7. 255.255.255.0 will
automatically appear


• Repeat the same
procedure for PC1.

• Enter 192.168.1.2
for PC1

• Close the IP
Configuration
window but not the
PC1 window

Testing connectivity - 1

1. Click on
Command Prompt

Available Commands in PC

• Command
prompt in PC of
Packet tracer
resembles the
real life but with
limited sets of
commands.

Testing connectivity with ping

1. ping PC0
(ip = 192.168.1.1)

Successful
ping !!

Note: ping is a to and fro
process. You don’t need
to ping from the other
side once this side is ok.

DHCP Server in Your LAN

Adding a DHCP server to your LAN
step by step

Server
• Drag a server in your “existing” LAN

1.Click here first
to get “End Devices”
2. Drag a “Generic” server in workspace.

Make Connection
• Connect Server0 to Switch0.

3. Click on Server0
and then Switch0 to
make a connection.

1.Click here first
to get Connections 2. Click on
“Automatically Choose Connection Type”

Configuring IP for Server - 1
• Double click on Server0, a Server0 window will appear.

1. Click on
IP Configuration

Configuring IP for Server - 2
6. Then click on Config

IP Configuration window

2. Enter 192.168.1.100

3. Press Tab key

4. 255.255.255.0 will
automatically appear

Setting DHCP service - 1

1. Click on
DHCP

Setting DHCP service - 2
• Setting the DHCP IP
range from
192.168.1.5 to
192.168.1.54

• If there are 52 PCs in
the network, DHCP is
not able to provide
the remaining two
PCs.

2. Change Start IP
address to 192.168.1.5

3. Change to 50

4. Press “Save”

Testing DHCP Service
6. You may test the PC1
with a ping to/from PC0

5. If your DHCP is set
correctly, you will obtain a
dynamic IP

4. Click on DHCP

3. Click on IP Configuration

2. PC1 windows pop up,
click Desktop tab.

1. Double click on PC1

Testing PC1 from PC0
1. Go to command
prompt of PC0

2. Type “ipconfig” to
check the IP of PC0

3. Ping PC1

DHCP: Packet Tracer & Real Life
• The “DHCP” option is Real Life
equivalent to “Obtain an IP
address automatically”
under Windows XP.

Packet Tracer

Review: Static IP and Dynamic IP
• As you’ve known, IP address in your PC is
assigned one of two ways:
– The IP is set manually (Static IP)
– The IP is set by DHCP services (Dynamic IP)
• Comments on Static IP
– Normally used for servers, printers, and routers.
– Not advisable for large network due to maintenance.
• Need to keep track.
• Easily set duplicate IP due to negligence (human error).
• Comments on Dynamic IP
– Used in normal PCs of large networks where it is
relatively easier to maintain.
– Used in wireless network where the computers/laptops
are mobile (in and out all the time).

Packet Tracer DHCP Service
• A typical DHCP service
configuration consists of:
– IP address range
– 1 Subnet mask
– 1 Default Gateway
– 2-4 DNS server IP
• The IP address range is
configured with:
– Starting IP Address
– Maximum # of users.
• TFTP Server IP is NOT a
typical DHCP configuration.

Linksys Wireless Router DHCP Service

• With reference to the
previous slide, a wireless
router has a similar DHCP
configuration (via its GUI
configuration page):
– Router IP = Default Gateway
– Subnet Mask
– IP address range
• Starting IP Address
• Max number of users
– 3 DNS IP

Linux DHCP Service configuration
• In real-life Linux DHCP service, the DHCP configuration is
typically stored in a file called “dhcpd.conf” file, as shown
below.
# Sample dhcpd.conf
# Configuration for an internal subnet.

subnet 10.1.1.0 netmask 255.255.255.0 {
range 10.1.1.2 10.1.1.25;
option domain-name-servers 10.1.1.1, 65.39.196.215,
65.39.192.130;
option domain-name "linuxhelp.ca";
option routers 10.1.1.1;
option broadcast-address 10.1.1.255;
default-lease-time 600;
max-lease-time 7200;
}

Router in Your LAN

Adding a Router to your LAN
step by step

Router
• Drag a 1841 router into the workspace.

1.Click here first
to get “Routers” 2. Click on
“1841” and drag
it the workspace.

Cisco 1841 router
Console port Rear View

Slot for module Fast Slot for module
(will discuss later) Ethernet Aux port (will discuss later) On/off switch
ports
(fa0/0 and fa0/1)

Front View

Connecting Router to Switch - 1

1.Click here first 2. Click on
to get Connections “Copper
Straight-Through”


3. Click on 4. Select
Router0, a small FastEthernet0/0,
window pops up. then click on it


6. Click on Switch0
Select
FastEthernet0/4,
then click on it

7. Red bubble Remember port
(not communicating) fa0/0 is connected
to the Switch0

Configuring IP in Router - 1
• Double click on
Router0 so that
this window can
pop up.

1. Click on “CLI” tab
to go into the router
configuration screen.

• Wait for the
router to boot
up


• Type “no” and
press enter to
continue.

Set port fa0/0 to have
ip = 192.168.1.200

1. Press ”enter” to
continue

2. Type ”enable” or “en”

3. Type ”configure
terminal” or “conf t”

4. Type ”interface fa0/0”
or “int fa0/0”

5. Type ”ip address
192.168.1.200
255.255.255.0”

6. Type ”no shutdown”

Router IP = Gateway of LAN

• The interface fa0/0
has a IP of
192.168.1.200.
• This IP will be the
default gateway IP
for all the hosts in IP address =
192.168.1.200
the LAN

Turn from red to green
bubbles after the command
“no shutdown” (ready to
communicate)

Key in Default Gateway IP in Hosts
• Key in 192.168.1.200 as the default gateway of PC0 and Server0
– Since both hosts are configured as static IP

Key in Default Gateway IP
in DCHP service
• The default gateway IP in
1. Press
DHCP service is different
from the default gateway
”Config” tab IP of Server0 in terms of
functionality
– Default gateway IP in
Server0 belongs to
Server0 itself.
– Default gateway in
DHCP service is for
other host that request
DHCP service.
– The same default
gateway IP in DHCP
service can’t be sent to
Server0 itself.

2. Press
”DHCP” 3. Change 0.0.0.0 to
192.168.1.200
4. Click on save

Dynamic IP in PC1

1. Type ”ipconfig” to
check the existing IP

2. Type ”ipconfig /renew”
to renew the dynamic IP from
DHCP service, since the
default gateway IP is added.

3. Type ”ping
192.168.1.200” to check
the connectivity to router
interface (default gateway)

Uccn1003 -may10_-_lect02b1_-_lan_basic_in_packet_tracer

More Related Content

What's hot (20)

Viewers also liked (20)

Similar to Uccn1003 -may10_-_lect02b1_-_lan_basic_in_packet_tracer (20)

More from Shu Shin (20)

Uccn1003 -may10_-_lect02b1_-_lan_basic_in_packet_tracer