Real 70-981 Questions and Answers – Most Popular Microsoft 70-981 Exam

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Lab 1.1: Network Workstation Client Configuration

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Lab 1.1: Network Workstation Client Configuration
In order for two computers to communicate in a TCP/IPv4 network (IPv6 is discussed later, in Lab 1.3), both computers must have a unique Internet Protocol (IP) address. An IP address has four octets. The IP address is divided into a network address and a host address. The subnet mask identifies which portion of the IP address is the network address and which portion is the host address. On a local area network (LAN), each computer must have the same network address and a different host address. To communicate outside the LAN, using different network IP addresses, the use of a default gateway is required. To connect to a TCP/IP network, normally four items are configured: the IP address (this is both the network portion and the host portion), the subnet mask, the IP address for a Domain Name System (DNS) server, and the IP address for the gateway machine. To communicate only within a LAN, you need only the IP address and subnet mask. To communicate with other networks, you need the default gateway. If you want to be able to connect to different sites and networks using their domain names, then you need to have the address of a DNS server as well. When communicating between machines on different networks, packets are sent via the default gateway on the way into and out of the LAN. The routing is done using (Layer 3) IP addresses. If the computer is on the same network, then the IP address gets resolved to a (Layer 2) Media Access Control (MAC) address to communicate with the computer. MAC addresses are hard-coded onto the network card by the company that made the card. The ability to retrieve and change your IP configuration is an important skill. In this lab, you will use the ipconfig command in Windows and the ifconfig command in Linux to view the configuration information. You will then use the Local Area Connection Properties window to change the IP address in Windows and use ifconfig to change the IP address in Linux. Computers use both MAC and IP addresses to communicate with one another across networks. In this lab, two computers will “talk” to each other via ping messages. You will then modify the Address Resolution Protocol (ARP) table of one computer to demonstrate the relationship between the IP and MAC addresses for a machine. The ping (Packet Internet Groper) program is a basic utility that is used for testing the connectivity between two computers. This message name was derived from the sound that sonar on a submarine makes, and is used in a similar way. A “signal” or request is sent out to probe for the existence of the target along a fixed “distance.” The distance between two computers can be measured using time to live (TTL). Ping operates using Internet Control Message Protocol (ICMP) to test for connectivity; so in cases where ICMP is restricted, the ping utility may not be useful. Ping is usually implemented using ICMP echo messages, although other alternatives exist. When you use the ping command in this lab, you will see that although you are using the IP address as the target of the ping, it is actually the MAC address that is used to communicate with that computer. IP addresses are used to transfer data from one network to another, whereas MAC addresses are used to send information from one device to another on the same network. It is ARP that resolves IP addresses to their associated MAC addresses. ARP is a Transmission Control Protocol/Internet Protocol (TCP/IP) tool that is used to modify the ARP cache. The ARP cache contains recently resolved MAC addresses of IP hosts on the network.

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Chapter 1: Workstation Network Configuration and Connectivity

As you progress through the labs, you will see how a computer obtains both MAC addresses and IP addresses in order to communicate. The question you should be considering is “how does the computer know that the information it is getting is correct?”

Learning Objectives
After completing this lab, you will be able to

Retrieve IP address configuration information via the command line. List the switches that can be added to the ipconfig (Windows) or ifconfig (Linux) command to increase its functionality. Use the Windows graphical user interface (GUI) to configure a network card to use a given IP address. Determine your machine’s MAC address. Determine your machine’s assigned network resources, including its DNS address and gateway address. Use the ifconfig (Linux) command to configure a network card with a given IP address. Understand how to test network connectivity between two computers. List the options that can be added to the ping command to increase its functionality. Use the arp command to view and manage the ARP cache on a computer.

S 10 minutes
Lab 1.1w: Windows Client Configuration
Materials and Setup
You will need the following:

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Windows XP Professional Windows 2003 Server

Lab Steps at a Glance
Step 1: Start the Windows 2003 Server and Windows XP Professional PCs. Log on only to the Windows XP machine. Step 2: View the network card configuration using the ipconfig command.

Lab 1.1w: Windows Client Configuration

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Step 3:

Change the IP address of the Windows XP machine.

Step 4: Verify the new IP address. Use the ipconfig command to verify that the IP address has changed. Step 5: Step 6: Step 7: Step 8: Change the IP address of the Windows XP machine back to the original address. Ping the Windows 2003 Server machine from the Windows XP PC. View and modify the ARP table. Log off from the Windows XP PC.

Lab Steps
Step 1: Start the Windows 2003 Server and Windows XP Professional PCs. Log on only to the Windows XP machine. To log on to the Windows XP PC:
1. 2.

At the Login screen, click the Admin icon. In the password text box, type the password password and press enter.

Step 2: View the network card configuration using the ipconfig command. On the Windows XP PC, you will view the network card configuration using ipconfig. This utility allows administrators to view and modify network card settings.
1. 2.

To open the command prompt, choose Start | Run, type cmd in the Open field, and press enter. At the command prompt, type ipconfig /? and press enter.
a.

Observe the options available for ipconfig.

b. Which options do you think would be most useful for an administrator? c. 3.

Which option would you use to obtain an IP configuration from a Dynamic Host Configuration Protocol (DHCP) server?

Type ipconfig and press enter, as shown in Figure 1-1.
a.

What is your IP address?

b. What is your subnet mask? 4.

Type ipconfig /all and press enter.
a.

Observe the new information.

b. What is the MAC address of your computer? c. 5.

What is your DNS server address?

Type exit and press enter.

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