Podobne
- Strona startowa
- Linux. .Mandrake.10.Podręcznik.Użytkownika.[eBook.PL] (3)
- Linux administracja sieciami zaawansowane ( 554 strony )
- Sams' Teach Yourself Linux In 24 Hours
- Bruce Morris Adventure Guide Florida Keys & Everglades National Park (2005)
- Linux Installation and Getting Started
- Linux Podręcznik Administratora Sieci
- Professional Feature Writing Bruce Garrison(3)
- Rushdie Salman Wschod Zachod (2)
- Sw. Brygida
- Helena Mniszkówna Sfinks
- zanotowane.pl
- doc.pisz.pl
- pdf.pisz.pl
- psmlw.htw.pl
Cytat
Do celu tam się wysiada. Lec Stanisław Jerzy (pierw. de Tusch-Letz, 1909-1966)
A bogowie grają w kości i nie pytają wcale czy chcesz przyłączyć się do gry (. . . ) Bogowie kpią sobie z twojego poukładanego życia (. . . ) nie przejmują się zbytnio ani naszymi planami na przyszłość ani oczekiwaniami. Gdzieś we wszechświecie rzucają kości i przypadkiem wypada twoja kolej. I odtąd zwyciężyć lub przegrać - to tylko kwestia szczęścia. Borys Pasternak
Idąc po kurzych jajach nie podskakuj. Przysłowie szkockie
I Herkules nie poradzi przeciwko wielu.
Dialog półinteligentów równa się monologowi ćwierćinteligenta. Stanisław Jerzy Lec (pierw. de Tusch - Letz, 1909-1966)
[ Pobierz całość w formacie PDF ]
.The ARPANET was an experimental network that was converted into an operationalone in 1975 after it had proven to be a success.In 1983, the new protocol suite TCP/IP was adopted as a standard, and all hosts on the network were required touse it.When ARPANET finally grew into the Internet (with ARPANET itself passing out of existence in 1990),the use of TCP/IP had spread to networks beyond the Internet itself.Many companies have now built corporateTCP/IP networks, and the Internet has grown to a point at which it could almost be considered a mainstreamconsumer technology.It is difficult to read a newspaper or magazine now without seeing reference to the Inter-net; almost everyone can now use it.For something concrete to look at as we discuss TCP/IP throughout the following sections, we will considerGroucho Marx University (GMU), situated somewhere in Fredland, as an example.Most departments run theirown Local Area Networks, while some share one and others run several of them.They are all interconnected andhooked to the Internet through a single high-speed link.Suppose your Linux box is connected to a LAN of Unix hosts at the Mathematics department, and its name iserdos.To access a host at the Physics department, say quark, you enter the following command:$ rlogin quark.physicsWelcome to the Physics Department at GMU(ttyq2) login:At the prompt, you enter your login name, say andres, and your password.You are then given a shell6 on quark,to which you can type as if you were sitting at the system's console.After you exit the shell, you are returned toyour own machine's prompt.You have just used one of the instantaneous, interactive applications that TCP/IPprovides: remote login.While being logged into quark, you might also want to run a graphical user interface application, like a wordprocessing program, a graphics drawing program, or even a World Wide Web browser.The X windows systemis a fully network-aware graphical user environment, and it is available for many different computing systems.To tell this application that you want to have its windows displayed on your host's screen, you have to set theDISPLAY environment variable:$ DISPLAY=erdos.maths:0.0$ export DISPLAYIf you now start your application, it will contact your X server instead of quark's, and display all its windows onyour screen.Of course, this requires that you have X11 runnning on erdos.The point here is that TCP/IP allowsquark and erdos to send X11 packets back and forth to give you the illusion that you're on a single system.Thenetwork is almost transparent here.Another very important application in TCP/IP networks is NFS, which stands for Network File System.It isanother form of making the network transparent, because it basically allows you to treat directory hierarchiesfrom other hosts as if they were local file systems and look like any other directories on your host.For example,all users' home directories can be kept on a central server machine from which all other hosts on the LAN mountthem.The effect is that users can log in to any machine and find themselves in the same home directory.Simi-larly, it is possible to share large amounts of data (such as a database, documentation or application programs)among many hosts by maintaining one copy of the data on a server and allowing other hosts to access it.We willcome back to NFS in Chapter 14, The Network File System.Of course, these are only examples of what you can do with TCP/IP networks.The possibilities are almost limit-less, and we'll introduce you to more as you read on through the book.We will now have a closer look at the way TCP/IP works.This information will help you understand how andwhy you have to configure your machine.We will start by examining the hardware, and slowly work our wayup.6The shell is a command-line interface to the Unix operating system.It's similar to the DOS prompt in a Microsoft Windows environ-ment, albeit much more powerful 25EthernetsThe most common type of LAN hardware is known as Ethernet.In its simplest form, it consists of a single cablewith hosts attached to it through connectors, taps, or transceivers.Simple Ethernets are relatively inexpensive toinstall, which together with a net transfer rate of 10, 100, or even 1,000 Megabits per second, accounts for muchof its popularity
[ Pobierz całość w formacie PDF ]