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Setting Up a Small Network
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It usually doesn t matter which ports you use on the hub, unless one is identified as 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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Figure 12-3 shows a schematic diagram of a typical network in a home or small business. This network includes both wired and wireless segments.
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Figure 12-3 The residential gateway deice can also proide the functionality of a cable modem, wireless access point, or both, eliminating the need to hae separate deices.
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Configuring each device on a wireless network so that they all communicate with each other (and not with nearby networks that share the same airwaves) has traditionally been a tricky task. Understanding the alphabet soup of abbreviations SSID, WEP, WPA, PSK, and MAC, to name a few and providing appropriate values for each is a task for a true wizard. Fortunately, Windows Vista includes a wizard for each configuration task in wireless networking. These wizards, along with configuration support such as Windows Connect Now in modern wireless networking equipment, truly make setup simple: 1. Run the wizard to configure the wireless access point. 2. Transfer the configuration settings to the wireless access point, either through a wired connection or by using a USB flash drive.
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3. Configure each computer and other wireless network device. This is most easily done by using a USB flash drive to transfer the configuration settings, but can also be done by running a wizard on each computer. Before we get into the details of setup and configuration, however, we discuss security. Because wireless signals potentially expose your network to anybody who comes near, it s important to understand and consider security implications before you make your first wireless connection.
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Understanding Security for Wireless Networks
On a conventional wired network, physical security is a given: If someone plugs a computer into your hub, you ll know about it immediately, and you can trace the physical wire back to the intruder s computer. On wireless networks, however, anyone who comes into range of your wireless access point can tap into your network and intercept signals from it. Finding open access points has become something of a sport; participants call it war driving. Although some war drivers seek open access points just for fun, other users who find their way into your network present several risks:
Theft of service An intruder might be able to access the internet using your connection, which could degrade the quality of your internet service. Denial of service An intruder who is unable to connect to your network can still cause some degree of havoc by flooding the network with connection requests. With enough persistence, an attacker could completely deny legitimate users access to the network. Privacy violations An intruder with the right tools can monitor all data sent over the network, and can therefore see which websites you visit (along with your passwords for those sites), documents you download from a shared network folder, and so on. Theft or destruction of data Outsiders who successfully connect to your network can browse shared folders and printers. Depending on the permissions assigned to these resources, they can change, rename, or delete existing files, or add new ones. Network takeover An intruder who manages to log on to the network and exploit an unpatched vulnerability can install a Trojan horse program or tamper with permissions, potentially exposing computers on the LAN to attacks from over the internet.
Wired Equivalent Privacy (WEP) WEP is a first-generation scheme for protecting authorized users of a wireless network from eavesdroppers by encrypting the data flow between the networked computer and the access point. To enter a WEP key, you supply a string of ASCII or hex characters (5 ASCII or 10 hex charac-
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