Presentation on theme: "1 InterNet InterNet 52807 52807"— Presentation transcript:
1 InterNet InterNet 52807 E-mail : email@example.com firstname.lastname@example.org 52807 E-mail : email@example.com firstname.lastname@example.org
2 *Introduction To Internet *Domain Name & Internet Address *The Basic Services of Internet *Your First Steps on Internet *Advanced Services of Internet *Introduction To Internet *Domain Name & Internet Address *The Basic Services of Internet *Your First Steps on Internet *Advanced Services of Internet
3 Introduction to Internet hWhat is a network? hWhat is Internet hA Brief History of Internet hWhat is a network? hWhat is Internet hA Brief History of Internet
4 What is a network? *Networks : computers are connected in such a way they can communicate. *Local-area Network (LAN): the network is composed of computers in the same area. *Wide-area Network (WAN): the network con- sists of computers spread across a larger area *Networks : computers are connected in such a way they can communicate. *Local-area Network (LAN): the network is composed of computers in the same area. *Wide-area Network (WAN): the network con- sists of computers spread across a larger area
5 LAN Accounting Shipping AdministrationR&D Production N etwork Connection
6 WAN Seattle San Francisco Dallas Omaha Toronto
8 What is The Internet? *A network of networks *A large collection of independent networks, all of which run TCP/IP, that are tied together.
9 The Internet NSFNET Other NETS APARNET MILNET TANET
10 What can Internet Do for Users? *Communication cElectronic Mail cI-Phone *Learning and Discussing tool cBBS cUsenet Collecting information cLibrary Searching *Entertainment cMUD *Commercial cOn-Line Order
12 IP Address uniquely *A way to identify uniquely an area of the Net or an computer on the Net *Consists of 4 digits, each of which ranges from 0 to 255 (usually 1-254), separated by dot(.) *126.96.36.199 c140 : Taiwan c113 : NCTU ask your network manager for an IP address *If you want to connect your computer to Inter-net, ask your network manager for an IP address
13 Domain Name System (DNS) Internet TW EDU NCTUCC CCSUN1 188.8.131.52 --> ccsun1.cc.nctu.edu.tw
14 Domain Name System(DNS) *A symbolic name for an IP-address (machine) *A domain: an organization level within Internet *Domains can be connected together (by dot (.)) to create a unique identifier. *left to right: most specific to most general *Top-level : organizational or geographic *ask your network manager for your domain Name(FQDN, Full Qualified Domain Name)
18 Hostname VS Domainname TW EDU NCTUCC CCSUN1 184.108.40.206 --> ccsun1.cc.nctu.edu.tw 1ccsun1 is the hostname of 220.127.116.11 1ccsun1.cc.nctu.edu.tw is the domainname(FQDN) of 18.104.22.168 1When you connect to a machine within the same domain, you can just use that machine's hostname
19 T he Basic Service of Internet `Virtual Terminal Service (telnet) `File Transfer Service (ftp) `E-Mail Service (SMTP)
20 Virtual Terminal Service (telnet) $telnet host Trying...Connected to host Escape Character is '^]' host's O.S. Version(host) login: <--- UserName passwd: <--- Password $........................................................ $logout Connection closed by foreign host................................................ W ork as if you are on host Use Resources and Services of host Come back to Local
21 File Transfer Service (ftp) $ftp host Connected to host. 220 host FTP server ready Name(host:username): Password: User username logged in. ftp> ftp> quit (Come back to the local) O K. Connect to FTP Server. You can get or put files now. E nter your username/ password
22 F ile Transfer Service (ftp) (Cont.) *Use get command to copy file(s) from the remote host. ftp> get *Use put command to copy local file(s) to the remote host. ftp> put *You can use cd, ls,....,etc. as in UNIX *Use ? in the 'ftp>' prompt to get help *You should be a user of the remote host to get /put files
23 Anonymous FTP *Some hosts on Internet are set up in a way that you can use file transfer service to get public domain utilities without an account on it. anonymous/ftp email@example.com (E-mail) $ftp host Connected to host. 220 host FTP server ready Name(host:username): anonymous/ftp Password:firstname.lastname@example.org (E-mail) ftp> Do as normal ftp
24 FTP Exercise ftp nctuccca.nctu.edu.tw ftp email@example.com pwd binary cd /NCTU/SLIP-Service ls get slippr13.zip quit * Anonymous FTP between PC and a server d:\> ftp nctuccca.nctu.edu.tw login: ftp password: firstname.lastname@example.org ftp> pwd ftp> binary ftp> cd /NCTU/SLIP-Service ftp> ls ftp> get slippr13.zip ftp> quit
25 FTP Exercise (Cont.) ftp ccsunxx YOUR USERNAME * Transfer files by your account d:\> ftp ccsunxx login: YOUR USERNAME YOUR PASSWORD lcd d:\ ? lcd ascii ? ascii get.cshrc cshrc.nod quit *password: YOUR PASSWORD ftp> lcd d:\ ftp>? lcd ftp> ascii ftp>? ascii ftp> get.cshrc cshrc.nod ftp> quit
26 E lectronic Mail (SMTP) *You can use Mail (BSD), mailx(SV), or elm to send your electronic letter to a remote user. *Mail user@host < letter.txt cYou send a file named letter.txt created in advance. chost should be a domain name unless you and the user are within the same domain. *Mail user@host cEnter your Subject and your message, and press CTRL-D to complete the input of your message.
27 Your First Steps on Internet %How to display the status of machines %How to check if a host is currently Available %How to list the users logged on to a system %How to talk to other users
28 Using the rup command *The function of the rup command: cDisplay the status of the machines within the same subnet *rup
29 Using the ping Command *The function of the ping command cTell you if a remote computer is currently available on the network. *ping : Display a short message *ping -s : Also show the performance of the link between you and the remote host cUse Ctrl-C to end the ping -s command.
30 Using the rusers/ku Command *Use rusers/ku to display the users logged into the systems within the same subnet. *rusers
31 Using the talk command *The function of the talk command: cLet you make a on-line conversation with other users *talk @ cUse Ctrl-C to terminate conversation. *Using the mesg cmesg y : allow the talk request cmesg n : reject the talk request cmesg : display the current mesg setup *Other version of talk: cctalk : Can use Chinese cytalk : Can talk with users on the systems not using UNIX ccytalk: Can use Chinese
32 E xample of talk Message from Talk_Daemon@ccsun2 at 16:00 talk: connection requested by jami@ccsun2 talk: respond with: talk jami@ccsun2 T he message shown on my screen Jami on ccsun2 want to talk with freddy Step1: Use rusers to find if freddy is logged onto some sysytem. Step2: Ah, freddy is on ccsun1 Step3: talk freddy@ccsun1 )freddy can issue talk jami@ccsun2 to begin the on-line conversation with jami
33 A dvanced Services of Internet `Usenet News `Gopher `BBS `WWW
34 U senet News *A collection of discussion groups that serves as a giant bulletin board. cYou can obtain the information you want from News. cYou can post a questions to the News and get your answer. cYou can respond your opinion on some topic or answer the question asked by others. *Use the tin command to read Usenet News Please use your eyes more than your fingers *As a novice user, Please use your eyes more than your fingers.
35 Gopher *Gopher is an information retrieval system that let you search information from all around the world. *Use the gopher command to enter the gopher system
36 BBS (Bulletin Board System) *Integrate a few of network services as a whole system. cPost and read of bulletin board (similar to news) cElectronic Mail cTalk cRetrieve files c.... *Use telnet and follow the direction to enter BBS
37 WWW (World-Wide Web) *WWW is a multi-media, hyper-text information providing system. *On PC Windows 95/NT cUse netscape or mosaic to browse WWW *On Workstation X-windows Screen cUse netscape or mosaic to browse WWW