Introduction to Data Communications and Networking

Lab 3: Office LAN
Objective
In this laboratory exercise, you will begin wiring your own computer network. To begin the
exercise, you will need to complete the following:
1. Assemble your network team. Record the names of all team members.
2. Determine the IP address for each computer in your network. Examples of IP addresses
that can be used are provided in Table 1. Your instructor will assign you to a LAN and
the accompanying IP address.
TABLE 1 Suggested IP Addresses
LAN 1 LAN LAN 3 LAN 4
102.123.83.10 128.123.83.20 122.124.16.30 115.91.4.40
102.123.83.11 128.123.83.21 122.124.16.31 115.91.4.41
102.123.83.12 128.123.83.22 122.124.16.32 115.91.4.42
102.123.83.13 128.123.83.23 122.124.16.33 115.91.4.43
102.123.83.14 128.123.83.24 122.124.16.34 115.91.4.44
All computers should be connected so that each computer in each LAN can communicate with the other
computers within its LAN.
Network Equipment Required
1. UTP patch cables
2. Switch / Hub
3. Host computers (Use your laptops)
4. WireShark Protocol Analyzer software
Required Tasks
1. Document devices connected to the office LAN.
2. Interconnect hosts/make connections from host computer to switch/hub.
3. Verify link lights when making the network connections.
4. Use the ipconfig/all command to view the MAC address.
5. Configure the host IP address.
6. Verify connectivity/ping hosts.
Procedure
1. Prepare a drawing for your network. You are to create the Office LAN drawing with
Microsoft Visio. You will do this outside of Lab and turn it in next week. Your network
must contain at least three computers. For students who don’t have Microsoft Visio, you
can use PowerPoint or any other drawing tool to create your network documentation.
2. List the MAC and IP addresses assigned to your networking devices. Configure the IP
address for each computer in your LAN. You will need to follow the steps provided
below to configure the IP address for your computer.
Configuring TCP/IP (i.e. set up a static IP address) on a windows PC.
What you need:
 IP address on the PC should be x.x.x.x
 The subnet mask should be 255.0.0.0 or 255.255.0.0 or 255.255.255.0
 The gateway IP address is x.x.x.1
 No DNS and DHCP are being used.
Steps:
1. First you need to configure the IP address. Access the Network and
Dial-up connections window and launch the local area connections
properties dialog box.
2. Locate and select the TCP/IP protocol component in the connection
window. This activates the properties button below the window. Click
the properties button to display the TCP/IP properties dialog box.
3. Choose the manual method of assigning an IP address.
4. Enter the information provided in the appropriate fields. Click ok after
entering all the information. Click ok again to exit the local area
connections.
3. Use the ping command to verify that you can see all the other computers on your
network. This requires that you know the IP addresses for each computer on your
network. Record the findings from using the ping command to verify network
connectivity.
Assignment (Required)
Submit your office LAN network drawing to the instructor on the date specified. Your drawing
must show the host computers, the MAC addresses, the IP addresses, and the network topology
(for example, star).Submit your drawing and a summery describing your experience with this lab
to the instructor.
The Ping Utility
Usage:
ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS] [-r count] [-s
count] [-j host-list] [-k host-list] [-w timeout]
Options:
-t: Ping the specified host until stopped; to stop, type Control-C.
-a: Resolve addresses to hostnames.
-n count: Number of echo requests to send.
-l size: Send buffer size.
-f: Set Don’t Fragment flag in packet.
-i TTL: Time To Live.
-v TOS: Type Of Service.
-r count: Record route for count hops.
-s count: Timestamp for count hops.
-j host-list: Loose source route along host-list.
-k host-list: Strict source route along host-list.
-w timeout: Timeout in milliseconds to wait for each reply.

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