c# qr code zxing Part 6: Networking in Visual C#.NET

Drawing QR Code 2d barcode in Visual C#.NET Part 6: Networking

Part 6: Networking
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Setting Up a Small Network
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As for the technical issues of security, virtually all of the detailed information on the Web that was published before mid-2004 has been rendered essentially obsolete by changes in Windows XP Service Pack 2. Unfortunately, the nature of the Web is such that many of those pages will never be updated, and anyone who relies on these instructions will find a solution that is, at best, incomplete. If you re looking for advice on wireless network security in Windows XP be especially skeptical of anything you , read that doesn t explicitly mention the significant changes in SP2. Is TCP/IP inherently insecure The single most controversial network security recommendation we ve encountered is the persistent claim that you should avoid using TCP/IP on your local area network. Adherents of this approach argue that you should reserve TCP/IP strictly for your Internet connection and install a second protocol either NetBEUI or IPX/SPX for use on your LAN. By unbinding the File and Printer Sharing service from the TCP/IP protocol, they contend, you make it less likely that a hacker can break into your network and access shared files and printers. Although this argument seems logical, it doesn t stand up to close examination. Specifically: This security routine was originally recommended for Windows 95 and its successors, during the era when most people used dial-up connections and broadband routers were exotic, expensive devices. These days, routers are dirt cheap and offer effective protection from unsolicited outside connections. In addition, Windows XP incorporates security features that block outside access to shared resources by default, and the Network Setup Wizard enables Windows Firewall on network configurations that are potentially unsafe. Windows XP has been in widespread release for more than three years. During that time we have not found a single documented instance where this multiple-protocol configuration would have prevented an attack. The justification is completely theoretical. Unbinding File and Printer Sharing does nothing to protect you from attacks on other ports via your TCP/IP-based connection to the Internet. If you neglect the basics of Internet security installing Critical Updates and configuring Windows Firewall or a third-party alternative a would-be attacker can exploit a security hole and install a Trojan horse program that gives him complete control over your PC and your network. So unbinding this service only provides you with the illusion that your network is secure. Adding multiple protocols creates needless complexity and increases the chance that some applications will fail to work properly. It can also slow network communications if the protocols aren't bound in the correct order. The bottom line We believe that a Windows XP network works best and is most secure when it uses only TCP/IP configured with appropriate security precautions. We strongly , advise against installing additional protocols unless you specifically need them to communicate with other computers and servers on your network and even then, these protocols should be used in addition to, not in place of, TCP/IP .
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Part 6: Networking
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Microsoft Windows XP Inside Out, Second Edition
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What You Can and Can t Do with a Small Network
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With a minimal investment in hardware, you can connect two or more computers and form a simple peer-to-peer network. Because these networks aren t built around a server, they don t allow you to manage users and shared resources centrally; instead, each computer contains its own database of authorized user accounts and shared folders, drives, and printers. Setting up a workgroup-based network offers the following advantages:
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Shared storage
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By designating certain folders as shared resources, you avoid the need to swap files on floppy disks or to maintain duplicate copies of files; instead, everyone on the network can open a shared report or access a collection of digital photos or music files from a single location. Sharing a printer allows any authorized network user to print to that device. By setting permissions on shared printers on a home network, you can prevent your kids from wasting expensive paper and ink on a high-quality color photo printer. (This option is available only with Windows XP Professional, and only if Simple File Sharing is disabled.) Using Internet Connection Sharing (ICS), you can set up Internet access on a single computer and allow every computer on the network to share that connection. This capability is most useful if you have a high-speed Internet connection, such as a cable or DSL modem; however, you can share a dial-up Internet connection and control it from any computer on the network. As we discuss in this chapter, using a hardware router offers significant security and performance advantages over ICS.
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