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`MODEMS
`FOR
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`by Tina Rathbone
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`MORE Modems For Dummies®
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`] 2§ Part II: More E-Mail, Files, and Other Riches
`
`
`
`“Join NewNet! Weoffer the most subscribers!” Occasionally your eye catches an
`ad thattouts a particular online service's large subscriber base as somesort of
`big deal. Back when the services were little islands unto themselves,this
`marketing ploy worked: Joining an online service that offered scads 0’ subscrib-
`ers meant reaching more scadsof discussion groups, conferences, and e-mail
`boxes.
`
`Today, any service worthits dial tone offers Internet e-mail, discussion groups,
`and World Wide Web access. The numberof subscribers to your particular
`online service or BBS no longer matters. Actually, less is more, in this case. A
`larger subscriber base means more callers clamoringto get online at the same
`time — and possibly a busy signal for you.
`
`NCr,
`
`sy “yy
`
`2 =
`
`In spite of the hoards of new computers hookingup to the Net each day, one
`truth remains constant.(In fact, this truth is what enables all these computers
`to join the network atall.) Every computer on the Internet has a universally
`recognizable address.
`
`
`
`A tisket, a packet
`among other things. Most importantly, TCP en-
`Before | can get into addresses,| have to talk
`sures that the packets can be reassembledinto
`about packets. See, every piece of data that
`meaningful data — or e-mail, for this chapter —
`passes through the Internet — everyfile, every
`on the receiving end.
`message — mustfirst be broken up into smaller
`chunks called packets. (Even your humblestlittle
`Together, IP and TCP makeit possible for com-
`“Me too” e-mail messages agreeing with your
`puters onthe Internet to communicate. Although
`friends on the indisputable superiority of the old
`they're two separate protocols, they work to-
`crayon colors.)
`getherso often that most peoplejustrefer to the
`whole scheme as TCP/IP. And finally, TCP works
`For the budding metrologists among you, each
`on top ofIP as a layer. That's why you're bound to
`packet measures no more than about 1000 char-
`see the relationship expressed as a TCP/IP stack.
`acters.It’s done automatically, thankfully — you
`don't have to even think aboutit.
`
`And now, a momentof thanks to IP and TCP. They
`remain the most popular way for computers to
`send, receive, and forward packets to and fro on
`the Internet.
`
`A computer mustbe able to yell, “Hey! I'm over
`here!” to other computers. So a fancy Internet
`Protocol (IP) evolved.
`IP pushes the packets
`around according to the universally accepted
`rules for Internet addresses.
`
`
`
`To learn more than you ever dreamed possible
`about TCP IP, and Internet addresses, check out
`MOREInternet For Dummies, by that most charm-
`An additional protocol oversees the packets’
`ing siblingesque duo, John Levine and Margaret
`orderliness: TCP, for Transfer Control Protocol.
`Levine Young.
`TCP dices the packets and numbers them,
` =SS
`
`First rule of intelligent tinkering: Save all
`
`the parts.
`
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