CCNA Lab 3.5.2 IP Addresses and Network Communication

Sonya Leoni
06491/2008

Lab 3.5.2 IP Addresses and Network Communication
Objectives

•  Build a simple peer-to-peer network and verify physical connectivity.

•  Assign various IP addresses to hosts and observe the effects on network

communication
Background / Preparation
In this lab, you will build a simple peer-to-peer network using two PCs and an Ethernet
crossover cable. You will assign various compatible and non-compatible IP addresses to the
hosts and determine the effects on their ability to communicate
The following resources are required:

•  Two Windows XP Professional PCs, each with an installed and functional Network

Interface Card (NIC)

•  An Ethernet cross-over cable to connect the PCs (provided by instructor)

•  (Optional lab setup) A hub or switch and two straight-through cables to connect the PCs (provided byinstructor)

Step 1: Connect the PCs to create a peer-to-peer network 
a. Obtain an Ethernet crossover cable provided by the instructor to connect the two
PCs.  NOTE: (optional lab setup) The PCs may be connected to a hub (or switch)
using two straight-through cables. The following instructions assume you are using a
crossover cable.
b. Plug one end of the cable into the Ethernet NIC of PC1. Plug the other end of the
cable into the Ethernet NIC of PC2. As you insert the cable, you should hear a click
which indicates that the cable connector is properly inserted into the port.

Step 2: Verify physical connectivity 
a. After the Ethernet crossover cable is connected to both PCs, take a close look at
each Ethernet port.  A link light (usually green or amber) indicates that physical
connectivity has been established between the two NICs. Try unplugging the cable
from one PC then reconnecting it to verify that the light goes off then back on.

b. Go to the Control Panel, double click the Network Connections icon, and confirm
that the local area connection is established. The following figure shows an active
local area connection. If physical connectivity problems exist, you will see a red X
over the Local Area Connection icon with the words Network cable unplugged.

c. If the Local Area Connection does not indicate that it is connected, troubleshoot by
repeating Steps 1and 2. You may also want to ask your instructor to confirm that you
are using an Ethernet crossover cable


Step 3: Configure IP settings for the two PCs 
a. Configure the logical IP addresses for the two PCs so that they are able to
communicate using TCP/IP. On PC1, go to the Control Panel, double click the
Network Connections icon, and then right click the connected Local Area Connection
icon. Choose Properties from the pull-down menu.

b. Using the scroll bar in the Local Area Connection Properties window, scroll down to
highlight Internet Protocol (TCP/IP). Click the Properties button

c. Select the Use the following IP address radio button and enter an IP address of
192.168.1.1 and a subnet mask of 255.255.255.0. With this IP address and subnet
mask, the network number the host is on is 192.168.1.0 and 192.168.1.1 is the first
host on the 192.168.1.0 network : 

d. Click OK, which will close the Internet Protocol (TCP/IP) Properties window.  Click
the Closebutton to exit the Local Area Connection Properties window.

e. Repeat steps 3a ± 3d for the PC2 using an IP address of 192.168.1.2 and a subnet
mask of255.255.255.0. The network number this PC is on is 192.168.1.0 and
192.168.1.2 is the second hoston the 192.168.1.0 network.


Step 4: Verify IP connectivity between the two PCs 
NOTE: To test TCP/IP connectivity between the PCs, Windows Firewall must be disabled
temporarily on both PCs. Windows Firewall should be re-enabled after the tests have
been completed. 
a. On each PC, on the Windows XP desktop, click Start. From the Start menu, select
Control Panel, and double-click Network Connections.
b. Right-click the Local Area Connection icon and select Properties. Click the
Advanced tab. Locate and click the Settings button.
c. Make a note of whether the firewall settings are ENABLED (ON) for the Ethernet port
or DISABLED (OFF) for the Ethernet port
d. If the firewall settings are enabled, click the Off (not recommended) radio button to
disable the firewall. The setting will be re-enabled in a later step. Click OK in this dialog box and the following to apply this setting. Repeat Steps 4a-4d on the second PC.
e. Now that the two PCs are physically connected and configured correctly with IP
addresses, we need to make sure they communicate with each other.  The pingcommand is a simple way to accomplish this task.  The ping command is included with the Windows XP operating system.
f. On PC1, go to Start, then Run.  Type cmd, and then click OK.  A Window command prompt window will appear as shown in the following figure.
g. On PC1, go to Start, then Run.  Type cmd, and then click OK.  A Window command prompt window will appear as shown in the following figure.

i.
Close the Windows command prompt window on both PCs.


Step 5: Change IP address for PC2
a. On PC2, go to the Control Panel, double click the Network Connections icon, and
then right click the connected Local Area Connection icon. Choose Properties from
the pull-down menu.

b. Using the scroll bar in the Local Area Connection Properties window, scroll down to
highlight Internet Protocol (TCP/IP). Click the Properties button.

c. Change the logical IP address for PC2 from 192.168.1.2 to 192.168.2.2 and leave
the subnet mask set to 255.255.255.0. On what network is PC2 now? 192.168.2.0

d. Click OK, which will close the Internet Protocol (TCP/IP) Properties window.  Click
the Close button to exit the Local Area Connection Properties window.
e. Refer back to Step 3c. On what network is PC1?192.168.1.0

f. The two PCs are still on the same physical Ethernet network. Are they on the same
logical IPnetwork?Tidak.


Step 6: Test network connectivity between the 2 PCs
a. On PC1, go to Start, then Run.  Type cmd, and then click OK.  A Window command
prompt window will appear.

b. At the > prompt, type ping 192.168.2.2 and press Enter. Was it successful?Tidak.
Why or why not?Karena PC 1 dan PC 2 tidak berada di satu network yang sama atau logical IP networknya tidak di satu network.


Step 7: Change IP address for PC1
a. Using the procedure previously described, change the logical IP address for PC1
from 192.168.1.1 to 192.168.2.99 and leave the subnet mask set to 255.255.255.0.
On what network is PC1 now?192.168.2.0

b. Click OK, which will close the Internet Protocol (TCP/IP) Properties window.  Click
the Close button to exit the Local Area Connection Properties window.
c. The two PCs are still on the same physical Ethernet network. Are they on the same
logical IP network now?Ya.


Step 8: Test network connectivity between the 2 PCs
a. On PC2, go to Start, then Run.  Type cmd, and then click OK.  A Window command prompt window will appear.
b. At the > prompt, type ping 192.168.2.99 and press Enter. Was it successful?Ya. Why or why not?karena PC 1 dan PC 2 mempunyai logical IP network yang sama, yaitu 192.168.2.0