bar code printing in vb.net 5: Advanced Networking in C#

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5: Advanced Networking
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20: Maintaining Network Security
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Unfortunately, the fact remained that many installations of Windows operating systems connected to the Internet remained highly insecure. In addition, the fundamental design of many Microsoft products, as well as that of many features included with Windows, led to a large number of security flaws. In 2002, Microsoft attempted to address these issues at every level of the company with their Trustworthy Computing Initiative. Triggered by a memo sent to all company employees by Microsoft Chairman and Chief Security Architect Bill Gates, Microsoft s Trustworthy Computing Initiative is an attempt to improve both the security and reliability of the company s products as well as Microsoft s public image. The Trustworthy Computing Initiative includes a number of extremely important steps:
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G Sending all Microsoft programmers to security training classes to help
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eliminate the introduction of low-level security vulnerabilities during the development process.
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G Freezing all new product feature development until top-down security
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reviews, designed to discover and document security vulnerabilities, are completed and software patches for those vulnerabilities released.
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G A focus on security as a critical feature of all new product development. G An end to the practice of automatically enabling features that could poten-
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tially expose users to security risks. Those features would have to be explicitly enabled by the end user. The first major product release to benefit from Microsoft s Trustworthy Computing Initiative was Windows XP. Windows XP was in the latter stages of testing when the Trustworthy Computing Initiative began; however, Microsoft had already committed to making Windows XP the most secure operating system the company has ever released. This determination shows in a number of areas. For example, Windows XP Professional includes Internet Information Services (IIS), but for the first time, IIS is not enabled by default during installation of the operating system. Additionally, Windows XP includes built-in support for automating Windows Update as well as the ability to automatically report application and system errors to Microsoft for analysis. Windows XP also includes Internet Connection Firewall (ICF), and security has been improved in both Microsoft Outlook Express and Microsoft Internet Explorer. No operating system, however, can remain completely secure without vigilant attention from users and system administrators, and adherence to secure practices. You ll learn all about these practices in this chapter. The next section analyzes the types of security threats that Windows XP users face.
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5: Advanced Networking
Part 5: Advanced Networking
Understanding Security Threats
There are two major categories of security threats that Windows XP users need to protect themselves from:
G Network-initiated threats in which remote hackers attempt to take advan-
tage of security flaws in software installed on network systems across WANs such as the Internet
G Local threats initiated by software running on local client computers
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The line between these types of threats is often blurred; for instance, some Internet worms are triggered by being executed on a local e-mail application such as Microsoft Outlook Express, but can also attempt to exploit remote computers over a computer s network connection. Another example is remote Web content that takes advantage of flaws in Microsoft Internet Explorer to attack a user s computer. However, these two categories are still useful when trying to understand the types of threats Windows XP users need to address.
Understanding Network-initiated Threats
The public image of security attacks centers on those initiated across remote networks, such as dial-up connections or the Internet. Although these attacks are far less melodramatic than those depicted in movies such as War Games (MGM, 1983), they remain a significant risk to any computer connected to a large network. Individual hackers can launch attacks across a network with a number of different goals in mind. They might want to gain control of a remote system to access sensitive information, to deface or damage data located on the system, or simply to use the system as a staging ground for other attacks. They might also want to disable the computer or the network to which it s connected.
Denial of Service Attacks
Attacks that disable a computer or the network to which it s connected are referred to as denial-of-service (DoS) attacks. DoS attacks are designed to prevent normal network functionality on a computer or a group of computers. Individuals can launch DoS attacks in several ways, for example:
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