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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.

The following is an example of the ROW_NUMBER function, which is used to return the row number for rows ordered by the contact s last name:

message.TimeToBeReceived = New TimeSpan(1, 0, 0)

The final step in configuring additional TCP/IP ports is to add the newly configured endpoint to the listener by performing the following steps: 1. Start SQL Server Configuration Manager. 2. Expand the SQL Server 2005 Network Configuration node. 3. Expand the Protocols node. 4. In the right pane, select the TCP/IP protocol, right-click, and select Properties. 5. On the IP Addresses tab, under IPAll, enter the new port number, as shown in Figure B-5.

Figure 6-1

A. Add Joe s user account to the Built-in Account Operators group for the domain. B. Add Joe s user account to the Itadmin3 OU. C. Reset Joe s computer account. D. Instruct Joe to log off, and then log on to his computer.

A customer calls and tells you that she recently got a new broadband DSL connection to the Internet. When the service person came to hook it up, everything was working fine, but whenever the customer opens Internet Explorer, Windows attempts to dial into her old ISP using her standard modem. The customer does not want to disable the standard modem or remove her dial-up network connection because she is not certain how reliable her new DSL connection will be. She does want Internet Explorer to auto matically use her new DSL connection when she accesses the Internet. What should you tell this customer to do

"VB Imports StockSymbolConsumerVB.localhost //C# using StockSymbolConsumerCS.localhost;

The Teller application has the following risks:

Creating a Custom Policy Assertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413

Recall from 1, "Learning the Basics," that HKCR was a link to the key HKLM\SOFTWARE\Classes before Microsoft Windows 2000, but it is more complicated now. Windows XP merges HKLM\SOFTWARE\Classes and HKCU\Software\Classes. The data in HKLM is default file associations and class registrations, whereas the data in HKCU is per user file associations and class registrations. HKCU\Software\Classes is really a link to HKU\SID _Classes, which Windows XP loads when it loads the profile hive in HKU\SID. If the same value appears in both branches, the value in HKCU \Software\Classes has higher precedence and wins over the value in HKLM\SOFTWARE\Classes. 1 described the benefits of this merge algorithm, but in short, it enables users to install applications and use file associations that don't affect other users. Thus, two users who share a computer can use two different programs to edit the same types of files. When you create a new key in the root of HKCR, Windows XP actually creates it in HKLM\SOFTWARE\Classes. Windows XP doesn't provide a user interface other than Registry Editor to add class registrations to HKCU\Software\Classes because the intention is to allow programs to register per user program classes. When you edit an existing program class, however, the change is reflected in HKLM or HKCU, depending on where the program class already exists. If the program class exists in both places, Windows XP updates only the version in HKCU.

' VB host.AddServiceEndpoint(GetType(ICalculate), binding, _ "net.tcp://localhost:8240/DemoService") // C# host.AddServiceEndpoint(typeof(ICalculate), binding, "net.tcp://localhost:8240/DemoService");

CustomersTable.Columns.Add("Address", Type.GetType("System.String"));

Default gateway: 131.107.120.1

14-16

It would be nice to have database environments simply appear, start working, and never need changes. However, we all live in a reality in which database systems have to be developed, tested, and adjusted to changing business climates over time. This lesson explains all the processes that are involved in implementing and maintaining operational database systems.