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Most network communications including downloading files, browsing the Web, and reading e-mail use the TCP Layer 3 protocol . TCP is considered a reliable network protocol because the recipient must confirm receipt of all transmissions . If a transmission isn t confirmed, it s considered lost and will be retransmitted . However, confirming transmissions can prevent TCP transfers from using all available bandwidth . This happens because TCP breaks blocks of data into small pieces before transmitting them, and recipients must confirm receipt of each piece of the data . The number of pieces that can be sent before waiting to receive confirmation receipts is called the TCP receive window size . When TCP was designed, network bandwidth was very low by today s standards, and communications were relatively unreliable . Therefore, waiting for confirmation for small pieces of a data block did not have a significant impact on performance . However, now that bandwidth is measured in Mbps instead of Kbps, a small TCP receive window size can slow communication significantly while the computer sending a data block waits for the receiving computer to send confirmation receipts . Figure 25-9 demonstrates how TCP confirms portions of a data block .

Here s piece #1 of the block I received piece #1. Please send piece #2. Here s piece #2 of the block. I received piece #2. Please send piece #3.

There are several ways that you can create and use background threads in the .NET Framework. You can use the ThreadPool class to access the pool of threads managed by the .NET Framework for a given process, or you can use the Thread class to explicitly create and manage a thread. Alternatively, you can use delegate objects or a Web service proxy to cause specific processing to occur on a non-UI thread. This section examines each of these different methods in turn and makes recommendations about when each should be used.

Over the years, the most common security threats have changed from viruses to worms and, most recently, to spyware and Trojan horses . To help protect users from these types of malicious software, Microsoft recommends using accounts with limited privileges (known as standard user accounts in Windows Vista or Limited user accounts in Windows XP) . Standard user accounts help prevent malware from making system-wide changes, such as installing software that affects multiple users if a user lacks permission to install a new application to a shared location, such as %SystemRoot%\Program Files, any malware the user accidentally runs is also prevented from making those changes . In other words, malware run in the context of the user account has the same security restrictions as the user . Although standard user accounts do improve security, using standard user accounts with Windows XP and earlier versions of Windows results in two major problems:

Users cannot install software, change the system time or time zone, install printers, change power settings, add a WEP key for wireless settings, or perform other common tasks that require elevated privileges .

18

Many poorly written applications require administrative privileges and do not run correctly with limited privileges .

Although logging on to your computer as a standard user offers better protection from malware, working with this type of account has been so difficult in the past that many organizations choose to give users administrative privileges on their computers . User Account Control (UAC) is a set of features first introduced in Windows Vista that offers the benefits of standard user accounts without the unnecessary limitations . First, all users (including administrators) run with limited privileges by default . Second, Windows Vista allows standard user accounts to change the time zone (but not the time) and perform other common tasks without providing administrative credentials, which enables organizations to configure more users with Standard accounts . Third, UAC enables most applications even those that require administrative privileges on Windows XP to run correctly in standard user accounts . diReCt FRoM tHe SoURCe

any enterprises are starting to lock down their users even on Windows Xp in an attempt to improve security and to comply with various regulations.

Windows Vista allows you to lock down these users to a greater degree by giving the users an access Denied By policy message box when they attempt an action that requires elevated privileges. You can configure this by defining the User account Control: Behavior Of The Elevation prompt For Standard Users Group policy setting as No prompt.