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Installing and Configuring a Wireless Network
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The CompTIA A+ Essentials exam expects you to know the names and connectors (or lack thereof) in wireless networking This chapter jumps back to Essentials for a bit and then returns to IT Technician and the other advanced exams
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Wireless networks represent the newest (and to me, one of the coolest) things happening in networking today The chance to get away from all the cables and mess and just connect has a phenomenal appeal Because I see wireless as one of the most important areas of development in the PC, this section goes a good bit deeper into the technology than the CompTIA A+ exams require A highly skilled tech today should know this stuff, because that s what your customers will demand To make it a little easier to study, I ve included some exam tips in this section that you can skim before taking the exams Instead of a physical set of wires running between network nodes, wireless networks use either radio waves or beams of infrared light to communicate with each other Different kinds of wireless networking solutions have come and gone in the past The types of wireless radio wave networks you ll find yourself supporting these days are those based on the IEEE 80211 wireless Ethernet standard Wireless Fidelity (Wi-Fi) and those based on Bluetooth technology Wireless networks using infrared light are limited to those that use the Infrared Data Association (IrDA) protocol Finally, the cell phone companies have gotten into the mix and offer access to the Internet through cellular networks (More on each technology later in the chapter)
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Wireless networking capabilities of one form or another are built into many modern computing devices Infrared transceiver ports have been standard issue on portable computers, PDAs, and high-end printers for years, although they re curiously absent from many of the latest PCs Figure 2168 shows the
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Figure 2168
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Infrared transceiver ports on a PDA and laptop
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infrared transceiver ports on a laptop computer and a PDA Wireless Ethernet and Bluetooth capabilities are increasingly popular as integrated components, or they can easily be added using USB, PCI, PCI Express, or PC Card adapters Figure 2169 shows a PCI card that accepts a wireless PC Card Ethernet card You can also add wireless network capabilities using external USB wireless network adapters, as shown in Figure 2170 Wireless network adapters aren t limited to PCs Many handheld computers and PDAs have wireless capabilities built-in or available as add-on options Figure 2171 shows a PDA accessing the Internet through a wireless network adapter card To extend the capabilities of a wireless Ethernet network, such as connecting to a wired network or sharing a high-speed Internet connection, you need a wireless access point (WAP) A WAP centrally connects wireless network nodes in the same way that a hub connects wired Ethernet PCs Many WAPs also act as switches and Internet routers, such as the Linksys device shown in Figure 2172
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Figure 2169
Wireless PC Card NIC inserted into PCI add-on card
Figure 2170
External USB wireless NIC
Figure 2171
PDA with wireless capability
21: Local Area Networking
Figure 2172
Linksys device that acts as wireless access point, switch, and DSL router
Figure 2173
External USB Bluetooth adapter, keyboard, and mouse
The CompTIA A+ Essentials exam loves questions on cables and connectors, so look for questions on USB adapters and WAPs
Wireless communication via Bluetooth comes as a built-in option on newer PCs and peripheral devices, or you can add it to an older PC via an external USB Bluetooth adapter Figure 2173 shows a Bluetooth adapter with a Bluetooth-enabled mouse and keyboard
IT Technician
Wireless Networking Software
Wireless devices use the same networking protocols and client that their wired counterparts use, and they operate using the CSMA/CA networking scheme The CA stands for collision avoidance, a slightly different standard than the collision detection standard used in wired Ethernet Here s the difference Wireless nodes listen in on the wireless medium to see if another node is currently broadcasting data If so, it waits a random amount of time before retrying So far, this method is exactly the same as the method used by wired Ethernet networks Because wireless nodes have a more difficult time detecting data collisions, however, they offer the option of using the Request to Send/Clear to Send (RTS/CTS) protocol When enabled, a transmitting node that determines that the wireless medium is clear to use sends an RTS frame to the receiving node The receiving node responds with a CTS frame, telling the sending node that it s okay to transmit Then, once the data is sent, the transmitting node waits for an acknowledgment (ACK) from the receiving node before sending the next data packet Very elegant, but keep in mind that using RTS/CTS introduces significant overhead to the process and can impede performance In terms of configuring wireless networking software, you need to do very little Wireless network adapters are plug and play, so any modern version of Windows will immediately recognize a wireless network adapter
It s tempting if you re studying for the Help Desk or Depot Technician exams (Exams 220-603 and 220-604) to minimize the importance of wireless networking This could come back to haunt you on the Essentials exam, though, so don t skip this section!
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