486 ChAPTER 12
Making QR Code In .NET Framework
Using Barcode drawer for .NET Control to generate, create QR Code 2d barcode image in VS .NET applications.www.OnBarcode.com
Recognizing Quick Response Code In .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET applications.www.OnBarcode.com
Troubleshooting Networking and Authentication-Authorization Issues
Barcode Creator In .NET
Using Barcode creator for VS .NET Control to generate, create bar code image in VS .NET applications.www.OnBarcode.com
Recognize Bar Code In .NET Framework
Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications.www.OnBarcode.com
Making QR Code In Visual C#
Using Barcode creation for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in Visual Studio .NET applications.www.OnBarcode.com
QR Code 2d Barcode Generation In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.www.OnBarcode.com
You can use the following questions to test your knowledge of the information in Lesson 1, Troubleshooting Network Issues. The questions are also available on the companion CD if you prefer to review them in electronic form.
Encoding Denso QR Bar Code In VB.NET
Using Barcode creator for .NET framework Control to generate, create QR Code image in VS .NET applications.www.OnBarcode.com
Bar Code Printer In .NET Framework
Using Barcode drawer for .NET framework Control to generate, create bar code image in .NET applications.www.OnBarcode.com
Painting Matrix Barcode In VS .NET
Using Barcode drawer for .NET Control to generate, create 2D Barcode image in VS .NET applications.www.OnBarcode.com
Bar Code Generation In .NET
Using Barcode generator for .NET framework Control to generate, create bar code image in Visual Studio .NET applications.www.OnBarcode.com
DataBar Encoder In VS .NET
Using Barcode drawer for VS .NET Control to generate, create GS1 DataBar Stacked image in VS .NET applications.www.OnBarcode.com
Generating GTIN - 14 In .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create UCC - 14 image in .NET applications.www.OnBarcode.com
Answers to these questions and explanations of why each answer choice is correct or incorrect are located in the Answers section at the end of the book.
EAN 128 Creator In Visual C#
Using Barcode creator for VS .NET Control to generate, create EAN128 image in .NET applications.www.OnBarcode.com
Bar Code Printer In Java
Using Barcode printer for Java Control to generate, create barcode image in Java applications.www.OnBarcode.com
1. 2. 3.
Code 128 Code Set C Generation In Java
Using Barcode generator for Java Control to generate, create Code 128 Code Set A image in Java applications.www.OnBarcode.com
Generate Code 39 In Objective-C
Using Barcode generator for iPhone Control to generate, create Code 39 Full ASCII image in iPhone applications.www.OnBarcode.com
Which of the following network troubleshooting tools is not included with the Windows 7 operating system
Drawing Barcode In Objective-C
Using Barcode generation for iPhone Control to generate, create barcode image in iPhone applications.www.OnBarcode.com
Generating 2D Barcode In Visual Basic .NET
Using Barcode printer for .NET framework Control to generate, create Matrix 2D Barcode image in VS .NET applications.www.OnBarcode.com
a. Ping.exe B. Network Monitor c. Pathping.exe D. Tracert.exe
Printing GS1 - 12 In None
Using Barcode generation for Font Control to generate, create Universal Product Code version A image in Font applications.www.OnBarcode.com
Draw Linear Barcode In Visual Basic .NET
Using Barcode generator for Visual Studio .NET Control to generate, create 1D image in .NET applications.www.OnBarcode.com
Which of the following network communication technologies is not capable of automatically negotiating the use of a common protocol for client/server communications
a. Wireless security protocols B. Wireless communication protocols c. Virtual private networking protocols D. Virtual private networking authentication protocols
Which of the following TCP/IP configuration settings, when incorrectly configured, completely prevents the computer from communicating on the network (Choose all correct answers.)
a. IPv4 Address B. Subnet Mask c. Default Gateway D. DNS Servers
Lesson 1: Troubleshooting Network Issues
Lesson 2: Troubleshooting Authentication and Authorization issues
Even with network connectivity confirmed, users still might be unable to access the net-work resources they need. In nearly all cases, users must authenticate themselves to confirm their identities before they can gain significant access to network resources. After the authentication, the system must authorize the users, to provide them with a specific degree of access to selected resources. If either one of these two processes fails, users cannot access the network.
After this lesson, you will be able to:
Recognize account problems affecting authentication and authorization. Recognize workstation problems affecting authentication and authorization. Recognize Kerberos problems affecting authentication and authorization.
Estimated lesson time: 60 minutes
Troubleshooting Logon Failures
When a user reports an inability to log on to an Active Directory Domain Services (AD DS) network, the troubleshooter is faced with a list of potential problems that range from mundane usability issues to extremely complex directory service matters. The first step in troubleshooting an authentication failure is to make sure that it really is an authentication failure. All of the net-working issues discussed in Lesson 1 of this chapter can prevent a user from logging on, but a true authentication problem assumes that network connectivity is intact. Therefore, troubleshooters should begin by confirming that the computer experiencing the logon problem is not affected by one of the standard permanent or transient network communication issues. The next step as usual is to determine the scope of the problem. If one user cannot log on to the AD DS domain from a particular workstation, can a different user log on from that workstation Can the first user log on from a different workstation Answering questions like these enable you to determine whether the problem lies in the user s account, in the workstation, or in the AD DS domain itself.
488 ChAPTER 12
Troubleshooting Networking and Authentication-Authorization Issues
Checking for Account Problems
Inability to log on to an AD DS domain could be the result of account problems, caused either accidentally or deliberately. This is particularly likely if only one computer or user is affected. You can make sure that the computer account for the workstation is not disabled in the AD DS domain and that the user account attempting to log on is not disabled. When the computer account is disabled, a message like the one shown in Figure 12-10 appears as the system starts. When the user account is disabled, the logon fails because the domain controller does not accept the credentials.
figURE 12-10 Results of a disabled computer account
You might find that another administrator has disabled one or the other of these accounts for some reason, or that the user has been locked out due to an excessive number of failed logon attempts. These are the simplest things to check, using the Active Directory Users And Computers console, as shown in Figure 12-11, and the simplest problems to remedy.