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Did the last chapter seem a bit IP address heavy to you When you open a Web page, for example, do you normally type something like http://19216841 or do you usually type something like wwwtotalsemcom Odds are good you probably normally do the latter and only rarely the former There s a good reason for this: people are terrible at memorizing numbers but are pretty good at memorizing words This creates an interesting dilemma Although computers use IP addresses to communicate with each other over a TCP/ IP network, people prefer easy-to-remember names over IP addresses To solve this problem, TCP/IP developers created a process called name resolution to convert names to IP addresses (and vice versa) to make it easier for people to communicate with the computers (Figure 10-1) Like any process that s been around for a long time, name resolution has gone through a number of evolutions over the years: some dramatic and some subtle Entire TCP/IP applications have been written, only to be supplanted (but never totally abandoned) by newer name resolution protocols The end result is that today we have a single major name resolution protocol called Domain Name System (DNS), but your brand new system running the latest version of whatever operating system you prefer still fully supports a number of much older name resolution protocols! Name resolution in today s networking world is like a well-run home that s also full of ghosts who can do very strange things if you don t understand how those ghosts think

Multiprotocol Label Switching (MPLS)

In this chapter, you ll take an in-depth tour of name resolution, starting with an in-depth discovery of DNS After DNS, the chapter looks at one of the scariest ghosts running around inside your computer: an ancient and theoretically abandoned name resolution protocol invented by Microsoft called Windows Internet Name Service (WINS) Despite what Microsoft claims, the ghost of WINS still lingers, not only on Windows computers, but even on most Linux and Macintosh OS X systems too, as these folks discovered that if you don t respect these ghosts, you won t be able to do name resolution when you connect to a Windows computer Odds are good you have a system that is connected or at least can connect to the Internet If I were you, I d fire that system up, because the vast majority of the programs you re going to learn about here come free with every operating system made Finding them may be a challenge on some systems, but don t worry I ll show you where they all hang out

1 f 1 = + i f = + i ( u + iv ) 2 x y y z 2 x = 1 u v i v u + + 2 x y 2 x y (322)

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When the Internet was very young and populated with only a few hundred computers, name resolution was pretty simple The original TCP/IP specification implemented name resolution using a special text file called HOSTS A copy of this file was stored on every computer system on the Internet The HOSTS file contained a list of IP addresses for every computer on the Internet, matched to the corresponding system names Remember, not only was the Internet a lot smaller then, there weren t yet rules about how to compose Internet names, such as that they must end in com or org, or start with www or ftp Anyone could name their computer pretty much anything they wanted (there were a few restrictions on length and allowable characters) as long as

Now we are in a position to determine whether or not a function is analytic that is, if it has no dependence on z by examining how it depends on the real variables

Wireless networking range is hard to define, and you ll see most descriptions listed with qualifiers such as around 150 feet and about 300 feet 80211 networks fell into the former category Like throughput speed, wireless range is greatly affected by environmental factors Interference from other wireless devices and solid objects affect range The maximum ranges listed in the sections that follow are those presented by wireless manufacturers as the theoretical maximum ranges In the real world, you ll see these ranges only under the most ideal circumstances True effective range is probably about half of what you see listed