c# printing barcode Lesson 2 in .NET framework

Make Quick Response Code in .NET framework Lesson 2

Lesson 2
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Managing DHCP in Windows Networks
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security clearance to bypass the company firewall be assigned a unique default gateway. In this example, you could configure options to distribute the unique default gateway to the security-exempt class. To create a custom or new user class, right-click the DHCP server icon in the DHCP console and select Define User Classes, as shown in Figure 7-11.
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Figure 7-11
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Creating a new user class
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You then need to set an ID string for the class. You designate this class ID string when you first create the class in the DHCP console, as shown in Figure 7-12. After defining a new class and specifying an ID string for that class, you can then set desired options for that class.
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Figure 7-12
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Designating a new class ID
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7
Configuring DHCP Servers and Clients
Finally, for the desired computers to inherit the options of the new class, you need to set the class ID of appropriate client computers to match the ID you have defined for that class at the DHCP server. You can achieve this task by executing the Ipconfig /setclassid command at a command prompt at each client computer. The user class option permits only one class ID to be used for identifying clients. In other words, each client computer can be identified as a member of only a single user class at the DHCP server. To create a new user or vendor class, complete the following steps: 1. Open the DHCP console. 2. In the console tree, select the applicable DHCP server. 3. JFrom the Action menu, select one of the following:
To create a new user class, select Define User Classes. To create a new vendor class, select Define Vendor Classes.
4. JClick Add. The New Class dialog box opens. 5. JIn the Display Name text box, provide a friendly name for the class. Optionally, fill in the Description text box. 6. JIn the ID text box, set the same binary or ASCII string that matches the DHCP class ID string that is either implemented or set at member clients. 7. Click OK and then Close to return to the DHCP console. To set DHCP class ID information at a client computer, complete the following steps: 1. JAt a DHCP-enabled client computer running Windows 2000, Microsoft Windows XP, or Windows Server 2003, open a command prompt. 2. JUse the Ipconfig /setclassid command to set the DHCP class ID the client uses when obtaining its lease from the DHCP server. You can use the Ipconfig /setclassid command as demonstrated in the following example command, which sets an ASCII string (MyNewClassId) as the DHCP class ID string for the local area network (LAN) connection in use at the client computer:
C:\>ipconfig /setclassid Local Area Connection MyNewClassId Windows IP Configuration Successfully set the class id for adapter Local Area Connection.
Note You can use the Ipconfig /showclassid <adapter number> command to display all the DHCP class IDs allowed by the DHCP server for any network adapter installed on your computer.
Lesson 2
Managing DHCP in Windows Networks
7-37
Practice 1: Performing a Manual Backup of the DHCP Server
In this practice, you back up the DHCP database.
Exercise 1: Backing Up the DHCP Database
In this exercise, you back up the DHCP database and then verify that the backup has been performed. 1. From Computer1, log on to Domain1 as Administrator. 2. Open the DHCP console. 3. JIn the console tree, right-click the DHCP Computer1.domain1.local), and then select Backup. server node (named
The Browse For Folder dialog box opens. The default folder in which to save the backed-up database is WINDOWS\System32\Dhcp\Backup. 4. Click OK to accept the default selection. 5. In Windows Explorer, browse to WINDOWS\System32\Dhcp\Backup. In this folder, you will see a file named DhcpCfg. This file contains a backed-up copy of the DHCP database. 6. Right-click the file named DhcpCfg and select Properties. The DhcpCfg Properties dialog box opens. According to the date and time listed next to Modified, the file has been modified just recently. The backup was successful. 7. Click OK to close the DhcpCfg Properties dialog box.
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