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And, of course, the .NET Framework ships with a massive class library which contains tens of thousands of types each type encapsulating common, reusable functionality . There are types for building Web form applications, Web services, rich GUI applications, working with security, manipulation of images, speech recognition, and the list goes on and on . Any of this code could throw an exception, indicating failure . And, future versions could introduce new exception types derived from existing exception types and now your catch blocks catch exception types that never existed before . All of this stuff object-oriented programming, compiler features, CLR features, and the enormous class library is what makes the .NET Framework such a compelling software development platform .4 My point is that all of this stuff introduces points of failure into your code which you have little control over . As long as everything is working great, all is well: we write code easily, the code is easy to read and maintain . But, when something goes wrong, it is nearly impossible to fully understand what went wrong and why . Here is an example that should really help get my point across:

2. From Computer1, while you are logged on to Domain1 as Administrator, open the Routing And Remote Access console. 3. In the console tree, select the Remote Access Policies node. 4. In the details pane, double-click the Telecommuters policy. The Telecommuters Properties dialog box opens. 5. In the Policy Conditions area, make sure the NAS-Port-Type Matches policy con dition is selected. 6. Click the Edit button. The NAS-Port-Type dialog box opens. 7. In the Available Types area, select Virtual (VPN). 8. Click the Add button. Virtual (VPN) appears in the Selected Types area. 9. Click OK. 10. In the Telecommuters Properties dialog box, click OK. 11. From Computer1, log off Domain1.

private static Object OneStatement(Stream stream, Char charToFind) { return (charToFind + ": " + stream.GetType() + String.Empty + (stream.Position + 512M)) .Where(c=>c == charToFind).ToArray(); }

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In this exercise, you create a VPN connection on Computer2 that connects to a current IP address on Computer1. The VPN connection defaults to a PPTP type because certif icate-based IPSec is unavailable. 1. From Computer2, log on to Domain1 as Administrator. 2. Open Network Connections. 3. In the Network Connections window, select New Connection from the File menu. The New Connection Wizard launches. 4. Click Next. The Network Connection Type page appears. 5. Select the Connect To The Network At My Workplace option, and then click Next. The Network Connection page appears. 6. Select the Virtual Private Network Connection option, and then click Next. The Connection Name page appears. 7. In the Company Name text box, type MyVPN. 8. Click Next. The Public Network page appears.

string SomeString = "Some string value."; string SomeOtherString = string.Copy("Some string value.");

This slightly contrived method contains just one C# statement in it, but this statement does an awful lot of work . In fact, here is the Intermediate Language (IL) the C# compiler produced for this method . (I ve put some lines in boldface italics that are potential points of failure due to implicit operations that are occurring .)

Implementing VPNs 10-63

9. In the Automatically Dial This Initial Connection drop-down list box, select MyISP. 10. Click Next. The VPN Server Selection page appears. 11. Leave Computer2 for the moment and move to Computer1. From Computer1, log on to Domain1 as Administrator. Use the MyISP connection to connect to the Internet. When you have connected, use the Ipconfig command to determine the public IP address currently assigned to Computer1. 12. Write the public IP address currently assigned to Computer1 in the space provided:

.method private hidebysig static object OneStatement( class [mscorlib]System.IO.Stream stream, char charToFind) cil managed { .maxstack 5 .locals init ( [0] class Program/<>c__DisplayClass1 CS$<>8__locals2, [1] object[] CS$0$0000) L_0000: newobj instance void Program/<>c__DisplayClass1::.ctor() L_0005: stloc.0 L_0006: ldloc.0 L_0007: ldarg.1 L_0008: stfld char Program/<>c__DisplayClass1::charToFind L_000d: ldc.i4.5 L_000e: newarr object L_0013: stloc.1 L_0014: ldloc.1 L_0015: ldc.i4.0 L_0016: ldloc.0 L_0017: ldfld char Program/<>c__DisplayClass1::charToFind

The length of a Java String is obtained by calling the String.length method; .NET provides the read-only property String.Length.

13. Return to Computer2. 14. On Computer2, on the VPN Server Selection page, type the public IP address cur rently assigned to Computer1 in the Host Name Or IP Address text box. 15. Click Next. The Connection Availability page appears. 16. Select the Anyone s Use option, and then click Next. The Completing the New Connection Wizard page appears. 17. Click Finish. The Initial Connection dialog box appears, asking whether you want to connect to MyISP now. 18. Click No. 19. Open Network Connections. In the window, a new heading named Virtual Private Network appears. Under this heading, you can see a new connection called MyVPN. Beneath its name, its status is described as Disconnected and its type is listed as WAN Miniport (PPTP). 20. Right-click MyVPN, and then click Properties. The MyVPN Properties dialog box opens. 21. Click the Options tab. 22. In the Dialing Options area, select the Include Windows Logon Domain check box. 23. Click the Networking tab. In the Type Of VPN drop-down list box, notice that Automatic is selected. With this setting, certificate-based L2TP/IPSec VPN connections with the VPN server are attempted first, and PPTP connections are attempted second. 24. Click OK.