c# qr code zxing Making Connections: Cables and Hubs in Visual C#.NET

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Making Connections: Cables and Hubs
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On a standard Ethernet network, all computers must be connected to a network hub (or a switch, which is physically identical to a hub and performs the same functions with higher levels of speed and efficiency in this chapter, when we refer to a hub, we mean either a hub or a switch). The hub is usually a small box with a row of jacks that accept RJ-45 connectors. Each jack is called a port. Most hubs designed for use on home networks and in small businesses have from four to eight ports. Here are some guidelines to follow when connecting your network to a hub:
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Place the hub in a central location. You must be able to run a cable from the hub to
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each computer on your network.
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The total length of all cables used on the network should not exceed 100 meters
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(328.1 feet). For most home networks, this is not an issue.
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It usually doesn t matter which ports you use on the hub, unless one is identified as
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uplink. Uplink ports are used to expand a network s capacity by connecting two hubs or sometimes to connect a hub to a router or broadband modem. On most hubs an uplink port cannot be used to connect to a computer, unless the uplink port has a switch to toggle it into a normal port mode. The uplink port achieves the same purpose as a crossover cable, and a toggle switch simply reverses the crossed-over lines to be able to accept a standard patch cable.
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Part 6: Networking
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Microsoft Windows XP Inside Out, Second Edition In addition to (or in place of) a hub or switch, your network may use a router or residential gateway. This type of device is specifically designed to connect to an external DSL or cable modem. Most such products designed for use in homes and small offices combine a router and hub; in this type of device, you connect your external DSL or cable modem to the Internet connector (often labeled as wide area network, or WAN) on the router and then connect each computer on the network to a port on the local area network (LAN) side. The simplest type of router is designed with a single Internet or WAN port and a single local port. If you have this type of device, connect the DSL or cable modem to the Internet connector and then connect the local port to your hub. If you plan to use Internet Connection Sharing and you have an external DSL or cable modem, you ll need to install two network adapters in the computer with the shared Internet connection. The DSL or cable modem connects directly to one network adapter and provides the Internet connection. Connect the second network adapter to the same hub as the other computers in your home network. If your cable or DSL modem is an internal device, or if you plan to share a conventional dialup modem rather than a broadband connection, you need to install only one network adapter in the computer that will act as the Internet Connection Sharing host.
Setting Up a Wireless Network
The original release of Windows XP includes a feature called Wireless Auto Configuration, which does most of the work of setting up your wireless network adapter, without requiring a lot of manual tweaking. Wireless Auto Configuration adds the following interface elements to a computer that is equipped with a WiFi adapter:
A Wireless Networks tab in the Properties dialog box for the wireless adapter. Messages in the notification area that indicate the availability of wireless networks and
the status of the current connection.
A Wireless Network Connection dialog box that lists networks available for
connection.
A snap-in for the Services console that allows you to manage the Wireless Zero Config 23
uration service. Since the original release of Windows XP, Microsoft has issued several updates that provide additional security and wireless configuration features. Windows XP Service Pack 2 (SP2) adds a new Wireless Network Setup Wizard that automatically configures compatible wireless computers, peripherals, and access points and sets security keys using either WEP or WPA. The SP2 version of the Wireless Network Connection dialog box is also different, designed with the goal of making it much easier to create a secure wireless network. In this section, we assume that you have already connected a wireless access point to your network and followed the manufacturer s instructions to set it up on your network.
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