zxing barcode reader example java Mike Meyers A+ Guide to Managing and Troubleshooting PCs in Software

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Mike Meyers A+ Guide to Managing and Troubleshooting PCs
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when it is installed into a PCI or PC Card slot, or a USB port, prompting you to load any needed hardware drivers You will, however, need a utility to set parameters such as the network name Windows XP has built-in tools for configuring these settings, but for previous versions of Windows, you need to rely on configuration tools provided by the wireless network adapter vendor Figure 2174 shows a typical wireless network adapter configuration utility Using this utility, you can determine your link state and signal strength, configure your wireless networking mode (discussed next), and set security encryption, power saving options, and so on
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The simplest wireless network consists of Figure 2174 Wireless configuration utility two or more PCs communicating directly with each other sans cabling or any other intermediary hardware More complicated wireless networks use a WAP to centralize wireless communication and bridge wireless network segments to wired network segments These two different methods are called ad-hoc mode and infrastructure mode
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Ad-hoc mode is sometimes called peer-to-peer mode, with each wireless node in direct contact with each other node in a decentralized free-for-all, as shown in Figure 2175 Two or more wireless nodes communicating in ad-hoc mode form what s called an Independent Basic Service Set (IBSS) Ad-hoc mode networks are suited for small groups of computers (less than a dozen or so) that need to transfer files or share printers Ad-hoc networks are also good for temporary networks such as study groups or business meetings
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Wireless networks running in infrastructure mode use one or more WAPs to connect the wireless network nodes to a wired network segment, as shown in Figure 2176 A single WAP servicing a given area is called a Basic Service Set (BSS) This service area can be extended by adding more WAPs This is called, appropriately, an Extended Basic Service Set (EBSS) Wireless networks running in infrastructure mode require more planning and are more complicated to configure than ad-hoc mode networks, but they also give you finer control over how the network operates
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Figure 2175
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21: Local Area Networking
Infrastructure mode is better suited to business networks or networks that need to share dedicated resources such as Internet connections and centralized databases If you plan on setting up a wireless network for a large number of PCs or need centralized control over the wireless network, infrastructure mode is what you need
Wireless Networking Security
One of the major complaints against wireless networking is that it offers weak security In many cases, the only thing you need to do to access a wireless network is walk into a WAP s coverage area and turn on your wireless device! Furthermore, data packets are floating through the air instead of safely wrapped up inside network caWireless infrastructure mode network bling What s to stop an unscrupulous PC tech with the right equipment from grabbing those packets out of the air and reading that data himself Wireless networks use three methods to secure access to the network itself and secure the data that s being transferred The Service Set Identifier (SSID) parameter also called the network name is used to define the wireless network This is very handy when you have a number of wireless networks in the same area!
Figure 2176
SSID
One of the main security weaknesses with wireless networks is that, out of the box, there s no security configured at all Wireless devices want to be heard, and WAPs are usually configured to broadcast their presence to their maximum range and welcome all other wireless devices that respond Always change the default SSID to something unique Configuring a unique SSID name is the very least that you should do to secure a wireless network The default SSID names are well known and widely available online This is intended to make setting up a wireless network as easy as possible, but conversely it creates a security hole you could drive a bullet train through Each wireless network node and access point needs to be configured with the same unique SSID name This SSID name is then included in the header of every data packet broadcast in the wireless network s coverage area Data packets that lack the correct SSID name in the header are rejected Another trick often seen in wireless networks is to tell the wireless device to not broadcast the SSID This makes it harder for people not authorized to access the network to know it s there
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