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To check the signal strength of a wireless network, see
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how many black curved bars the AirPort menu icon is displaying: from four bars (for a strong signal) down to one bar (for a very weak signal)
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UNDERSTANDING TCP/IP ESSENTIALS
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Networking protocols are sets of standards used to package and transmit data over a network The protocol determines how the information is divided into packets (units) for transmission, how it is addressed, and what is done to ensure it is transferred reliably To transmit data between your Mac and another computer, Mac OS X uses TCP/IP, the networking protocol used on the Internet TCP/IP is a powerful protocol and very complex Mac OS X makes TCP/IP configuration as straightforward as possible, masking most of the ugly details from your sight Yet it helps if you understand a few essentials about TCP/IP First, there are two main versions of the Internet Protocol: version 4 (usually called IPv4) and version 6 (usually called IPv6) IPv4 is still used most widely in North America and in much of the world, so this section
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SET YOUR PREFERRED ORDER OF WIRELESS NETWORKS
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If your Mac connects to multiple wireless networks, tell your Mac your order of preference for the networks:
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Open the menu and click System Preferences to open the System Preferences window
Click Network The Network pane will be displayed Select AirPort in the left list box Click the Advanced button to display the AirPort sheet Make sure the AirPort tab is selected, as in Figure 9-6
In the Preferred Networks list, set your preferred order by dragging the networks up and down so that the network you want to use first appears at the top If necessary, add other networks to the list Click the + button below the list box, specify the details in the Enter The Name Of The Network dialog box, and then click the Add button
discusses it IPv6 is the new version, is widely used in China and other rapidly developing economies, and will eventually take over from IPv4 IP ADDRESSES
TCP/IP identifies the different computers (actually, the different network interfaces more on this in a moment) on a network by using addresses called IP addresses In IPv4, an IP address takes the form of four groups of three decimal numbers separated by periods for example, 19216801 The first group (here, 192) defines the largest unit; the second group defines the unit within that unit; the third, another unit within the second unit; and the fourth, another unit within the third In layperson s
terms, each of the numbers can go up to 255 (This is a generalization and ignores some exceptions) Continued
Figure 9-6: Tell your Mac the order in which you want it to connect to wireless networks when they re available
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UNDERSTANDING TCP/IP ESSENTIALS (Continued)
For identification, each IP address must be unique on the network it s being used on, so each network interface on a network is assigned a different IP address Most Macs come with several ways to connect to another computer or network: the network connection, the FireWire port, the internal modem, and maybe an AirPort card You can use two or more connections at the same time,
Choose other options as needed:
Select the Remember Any Network This Computer Has Joined check box if you
want Mac OS X to remember all networks This setting is handy if you use several networks, but turn it off if you connect to many public networks on a one-time basis
Select the Disconnect From Wireless Networks When Logging Out check box
if you tend to use a network for a session and then move on If you use a wireless network at home, leave this check box cleared so that you can stay connected even when you log out
Select the Require Administrator Password To Control AirPort check box if you
want to prevent non-Administrator users from configuring the AirPort
so one Mac can have two or more IP addresses at once These IP addresses can be on the same network, but they ll typically be on different networks For example, when your Mac is connected directly to the Internet (rather than through a shared broadband connection), it has one IP address on the Internet and another IP address on your local network The Internet functions as a single huge TCP/IP network, so each computer on the Internet must have a unique
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When you ve finished setting your order of preference for wireless networks and choosing options, click OK Open the System Preferences menu and click Quit System Preferences to close System Preferences
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