Checking for Transmission Issues in Visual Studio .NET

Maker QR Code JIS X 0510 in Visual Studio .NET Checking for Transmission Issues

Checking for Transmission Issues
QR Code Generator In Visual Studio .NET
Using Barcode generator for .NET framework Control to generate, create QR Code 2d barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Decode QR Code In Visual Studio .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
The inherent uncertainty of radio transmissions is the single biggest difference between wireless and wired networks. Therefore, in the case of a networking problem involving wireless computers, you should consider transmission issues as possible causes before you proceed on to the TCP/IP configuration and infrastructure issues discussed earlier. The single most common cause of networking failures on wireless networks, whether permanent or intermittent, is the inability of the computer to acquire a signal from a wireless access point. There are many possible reasons for a signal acquisition failure, including excessive distance, intervening walls and structures, antenna configuration, and electromagnetic interference. It is often the case with wireless networking that conditions that were favorable for a connection on one day are unfavorable on the next, and it is difficult, if not impossible, for an administrator with the usual tools and skills to determine why. However, because wireless computers are frequently mobile, the easiest way to test for a transmission issue can often be to move the computer closer to the wireless access point.
Bar Code Generator In .NET Framework
Using Barcode generation for .NET Control to generate, create barcode image in .NET applications.
www.OnBarcode.com
Barcode Scanner In VS .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Lesson 1: Troubleshooting Network Issues
QR Code JIS X 0510 Printer In C#.NET
Using Barcode generator for .NET Control to generate, create QR Code image in .NET framework applications.
www.OnBarcode.com
QR Code 2d Barcode Creation In .NET
Using Barcode generator for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications.
www.OnBarcode.com
ChAPTER 12
Creating QR Code JIS X 0510 In VB.NET
Using Barcode creator for .NET framework Control to generate, create Denso QR Bar Code image in VS .NET applications.
www.OnBarcode.com
Draw EAN / UCC - 14 In .NET
Using Barcode creator for .NET Control to generate, create UCC-128 image in .NET framework applications.
www.OnBarcode.com
If network connectivity improves, you must consider some way to make that adjustment more permanent. You can install additional wireless access points on the network; install a more effective antenna on the computer; remove sources of interference, such as microwaves and cordless phones; or just keep the computer closer to the access point.
Print Linear In .NET
Using Barcode generator for .NET Control to generate, create Linear 1D Barcode image in VS .NET applications.
www.OnBarcode.com
EAN13 Generation In VS .NET
Using Barcode generation for .NET framework Control to generate, create GS1 - 13 image in Visual Studio .NET applications.
www.OnBarcode.com
Detecting Encryption Issues
Creating Barcode In Visual Studio .NET
Using Barcode printer for VS .NET Control to generate, create barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Identcode Generation In .NET Framework
Using Barcode encoder for Visual Studio .NET Control to generate, create Identcode image in Visual Studio .NET applications.
www.OnBarcode.com
Another extremely common source of wireless networking failures is the incompatibility or misconfiguration of wireless security protocols. As in any communications system, both parties must speak the same language. When they do not, no communication is possible. Wired networks are vulnerable to attacks facilitated by signal interception, but the attacker must have physical access to the network, in the form of a computer with a network cable connection. Wireless networks are also vulnerable, but access to them is much easier to achieve. In many cases, attackers can covertly access a wireless network from a mobile computer in a building s parking lot. To protect a wireless network, security protocols are essential, and all of the wireless equipment on the network must support the same one. Most of the early wireless LAN systems supported the Wired Equivalent Privacy (WEP) protocol, but this was found to have some serious shortcomings. Today, most wireless LAN implementations support Wi-Fi Protected Access (WPA and WPA2). Wireless security protocols do not have automatic negotiation capabilities, as many other communication protocols do. For example, when two wireless devices based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standards attempt to connect, they negotiate the fastest common standard they possess, falling back on the slower standards to maintain compatibility. By contrast, administrators must configure the devices to use a specific security protocol in a specific mode. If the two devices do not use the same protocol, they cannot communicate. Wireless LAN devices typically have some means of displaying the other wireless devices they detect in the area, as shown in Figure 12-7, so troubleshooters can easily distinguish between transmission issues and encryption issues. If a computer is receiving a reasonably strong signal from an access point to which it cannot connect, the security protocol or its configuration are most likely the reason for the failure.
Painting GTIN - 128 In Java
Using Barcode drawer for Java Control to generate, create USS-128 image in Java applications.
www.OnBarcode.com
ECC200 Recognizer In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
480 ChAPTER 12
GS1 - 13 Recognizer In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
PDF417 Decoder In Visual Basic .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Troubleshooting Networking and Authentication-Authorization Issues
PDF 417 Generator In None
Using Barcode drawer for Microsoft Word Control to generate, create PDF417 image in Office Word applications.
www.OnBarcode.com
Decoding Barcode In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
www.OnBarcode.com
figURE 12-7 Detected wireless devices
Scanning Bar Code In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Bar Code Creator In VS .NET
Using Barcode maker for ASP.NET Control to generate, create bar code image in ASP.NET applications.
www.OnBarcode.com
In addition to using the correct security protocol, wireless devices must also have that protocol configured identically. For example, devices configured to use WPA or WPA2 must have the same encryption option setting, which specifies the algorithm they use to encrypt data, and more important, the same passphrase. A passphrase is an alphanumeric string that you select, which the devices use to encrypt data. If you don t configure all of the devices on the network with the same passphrase, they cannot communicate. Determining whether a wireless communication problem is being caused by an encryption issue is relatively simple. If you temporarily turn off the encryption on both devices and they are able to communicate, encryption is definitely the problem. Troubleshooting security protocol settings can be problematic, however, because computers and access points use different interfaces for security configuration. Sometimes options for the same setting or feature have different names, and the process of getting devices to communicate can be a matter of trial and error. For example, the Windows 7 Wireless Network Properties sheet, shown in Figure 12-8, refers to the encryption protocol as the Security type.
Copyright © OnBarcode.com . All rights reserved.