1. 1. Introduction to the Internet
2. 2. Introduction to Internet 206/18/15 Contents Concepts & History Protocol, TCP/IP Connecting to the Internet, Proxy Internet Services World Wide Web, Internet Explorer Electronic Mail Information Searching E-commerce Computer Viruses
3. 3. Introduction to Internet 306/18/15 Concepts Mng my tnh (computer network) Khi nhiu hn mt my tnh c kt ni vi nhau v c th trao i thng tin mng my tnh. LAN (Local Area Network) Phm vi hp. Mng my tnh ca c quan, trng hc, Caf Internet, WAN (Wide Area Network) Phm vi rng. Mng my tnh trong thnh ph, quc gia, Internet (ch I vit hoa) Global Area Network. Global Network of networks.
4. 4. Introduction to Internet 406/18/15 Internet map
5. 5. Introduction to Internet 506/18/15 Internet history ARPANET, 1969, USA. Advanced Research Projects Agency Network. Phc v mc ch qun s. 4 nt mng (node) ban u: University of California Los Angeles (UCLA). Stanford Research Institute (SRI). University of California Santa Barbara (UCSB). University of Utah. ARPANET nhanh chng c m rng Internet. Khng c c quan chnh thc qun l Internet. Tham kho thm: http://www.isoc.org/internet/history.
6. 6. Introduction to Internet 606/18/15 Giao thc (protocol) Cc my tnh ni chuyn vi nhau ntn? Phi c kt ni (connected): NIC, Modem, Cable,... Quy tc trong vic gi & nhn d liu giao thc. Internet s dng b giao thc TCP/IP Transmission Control Protocol/Internet Protocol. Mi MT c xc nh bi a ch IP (IP address). a ch IP (IPv4): S 32 bits (vit = 4 byte 8 bits, cch nhau bi du chm). V d vi a ch: 203.162.8.82 C 2^32 = 4.294.967.296 /c IP khc nhau
7. 7. Introduction to Internet 706/18/15 Xem a ch IP trong Window 2000/XP Start Run. cmd ipconfig IP Address 192.168 IP ca my tnh trong mng LAN (ca trng HNNI). Subnet Mask ping www.yahoo.com net send may01 Hello
8. 8. Introduction to Internet 806/18/15 Kt ni vi Internet (how to?) Nh cung cp dch v Internet (ISP - Internet Service Provider): America Online. VDC (VNPT). FPT, Viettel, Netnam, MT gia nh, c quan, kt ni qua ISP. Dial-up. ADSL. Leased line. Wireless.
9. 9. Introduction to Internet 906/18/15 Khi kt ni vo Internet: - MT c cp mt a ch IP - C th trao i thng tin vi cc MT khc trong mng ton cu ny. Kt ni thng qua mng in thoi Kt ni trc tip vi ISP qua mng T (PSTN)
10. 10. Introduction to Internet 1006/18/15 LAN Kt ni gin tip vi ISP thng qua proxy Proxy server MT trong LAN ni Internet gin tip qua proxy. Windows 2000/XP: Start Settings Control panel. Internet Options. Connections LAN Settings. PC.. PC2 PC1 Proxy server Internet ISP ?
11. 11. Introduction to Internet 1106/18/15 Dch v Internet (Internet services) Kt ni vi Internet lm g? trao i thng tin vi th gii! S dng dch v Internet: nhiu lm! World Wide Web (WWW). Electronic Mail. Information Searching. Instant Messenger (AOL, Yahoo! Messenger,). Internet Relay Chat (IRC). Internet Phone. Internet Games.
12. 12. Introduction to Internet 1206/18/15 World Wide Web (WWW) Tim Berner Lee, 1989: HTML, WWW. Trang web (web page): Mt dng ti liu c s dng ph bin trn Internet. Cho php trnh by ch, hnh nh, m thanh, HTML (Hyper Text Markup Language). My tnh cung cp ti liu HTML web server. WWW = Tt c web servers+ web pages. Website Web pages ca mt t chc, trng H, c nhn Trang ch (home page) cha link ti cc trang khc thuc website. WWW , ang l v s vn l dch v ph bin nht trn Internet.
13. 13. Introduction to Internet 1306/18/15 Khai thc WWW khai thc WWW, cn: Kt ni vi Internet. Trnh duyt web (web browser): L phn mm khai thc WWW. Vd: Internet Explorer, Mozilla, Netscape Navigator, Web Browser Web ServerDn ng trn Internet!!! web address Ti cn trang web! Ti c trang web anh cn! Anh cn trang web no? web pages
14. 14. Introduction to Internet 1406/18/15 Microsoft Internet Explorer Web page title Web page Status bar Kch p chut vo Internet Explorer trn mn hnh khi ng! Back, Forward, Stop, Refresh Hyperlink Web address Go button
15. 15. Introduction to Internet 1506/18/15 Web Address Web address: Cho bit trang web t ti u. Bt u bng http:// (Hyper Text Transfer Protocol) http://www.ptit.edu.vn/default. asp www World Wide Web. ptit Hanoi Agricultural University No 1. edu education. vn Vietnam. default.asp ng dn ti tp default.asp.
16. 16. Introduction to Internet 1606/18/15 Domain types and countries edu (education), ac (academic) : cc trang web gio dc. com (commercial): cc trang web thng mi. org (organization): cc trang web phi li nhun. gov (government): cc trang web ca chnh ph. mil (military): cc trang web ca qun i. net, biz, info, vn: Vietnam. uk: United Kingdom. au: Australia. ca: Canada. de: Germany. jp: Japan. cn: Chinese. hk: Hong Kong. th: Thailand. sg: Singapore. Ring M khng c ui: (http://www.yahoo.com).
17. 17. Introduction to Internet 1706/18/15 Hyperlink s lin kt cc trang web Lin kt t trang web ny ti trang web khc. Kch n vo link chuyn sang trang web khc (c ch ra bi link ). Mu xanh cha thm, Mu tm thm. Text hyperlink Image hyperlink
18. 18. Introduction to Internet 1806/18/15 Microsoft Internet Explorer (cont) Lu trang web ln a: File Save As Lu hnh nh ln a: Kch chut phi vo hnh nh. Chn Save Picture As Ti v (download) cc tp: Kch chut phi vo hyperlink ti tp. Chn Save Target As Favorites: Link ti nhng trang web a thch. a trang ang duyt vo Favorites: FavoritesAdd to Favorites
19. 19. Introduction to Internet 1906/18/15 Mt vi dch v WWW ng quan tm Cc trng H: Bch Khoa: http://www.hut.edu.vn H Cn Th: http://www.ctu.edu.vn Harvard: http://www.harvard.edu Stanford: http://www.stanford.edu MIT: http://www.mit.edu http://ocw.mit.edu MIT Open CourseWare. Cambridge: http://www.cam.ac.uk Queensland: http://www.uq.edu.au Th vin: Internet Public Library: http://www.ipl.org T/vin Quc Gia: http://www.nlv.gov.vn/ Mng gio dc: http://www.edu.net.vn Th vin H: t website ca H. Tin tc: CNN: http://www.cnn.com BBC: http://www.bbc.co.uk VNExpress: http://vnexpress.net VietnamNet: http://www.vnn.vn Bo H Ni mi: http://www.hanoimoi.com.vn Bo Nhn Dn: http://www.nhandan.org.vn Trao i (forum): http://www.edu.net.vn/forum http://www.ttvnol.com/forum Danh b web: http://dir.yahoo.com http://danhba.vdc.com.vn
20. 20. Introduction to Internet 2006/18/15 Electronic mail (Email, E-mail) Th in t (Internet email) l mt phng thc trao i thng tin ngi-ngi trong thi i Internet. Mun s dng th in t phi ng k vi nh cung cp: Min ph: Yahoo Mail: http://mail.yahoo.com Hotmail: http://hotmail.com Tr tin: FPT, VNN, Yahoo, Hotmail, Cc cng ty, trng H ch cung cp email cho cn b hoc sinh vin.
21. 21. Introduction to Internet 2106/18/15 Email box v Email address Email box: Hm th in t. L mt khng gian cha email ti my ch ca nh cung cp email. Mi hm th c mt a ch (email address). john@yahoo.com: john: email ID (ch nhn ca hm th). yahoo.com: Domain name (tn min, ni t hm th). @: c l at john@yahoo.com = a ch th in t ca ng John ti yahoo.com.
22. 22. Introduction to Internet 2206/18/15 Practising with Yahoo! Mail To hm th mi Truy nhp http://mail.yahoo.com. Kch chut vo Sign Up. Chn dch v min ph (Free). in thng tin ng k. Nh Yahoo ID v Password. S dng Yahoo! Mail trn web Truy nhp http://mail.yahoo.com. ng nhp vi Yahoo ID v Password ng k. Nhn th, gi th, gi file nh km, i mt khu. Vi Yahoo! ID va to, c th s dng Yahoo! Mail, Photos, Groups, Messenger, Tht tuyt!
23. 23. Introduction to Internet 2306/18/15 Danh sch th tn (Mailing list) Mt /c email c bit: Khi gi email ti a ch ny, email c nhn ln v gi cho nhiu /c khc. Cc a ch khc cc thnh vin ca danh sch. Danh sch thnh vin do ngi qun l danh sch lp ra. Mt vi nh cung cp dch v mailing list http://groups.yahoo.com (rt tt!) http://www.coollist.com Mailing list l mt cng c rt th v trao i thng tin trong mt lp /v sinh vin hin nay!!!
24. 24. Introduction to Internet 2406/18/15 Tm kim thng tin trn Internet Thng tin (information) trn Internet Bao trm hu ht cc lnh vc. Dung lng khng l. Tuy nhin, ch 30% trong s l hu ch. Khng ai kim sot c ht. Vd: Tri thc, tin tc, Vn :m kim y b??? Hng gii quyt Search Engine. Danh b web. T in bch khoa ton th. T in tra cu khc. Catalog ca th vin. Cc c s d liu tm tt.
25. 25. Introduction to Internet 2506/18/15 M-t tm kim (SE -Search Engine) Dch v tm kim a ch web theo yu cu trn Internet. Ngi dng nhp xu tm kim (Vd: Japan Earthquake). SE cung cp danh sch trang web lin quan. Mt vi SE: http://www.google.com.vn http://www.altavista.com http://www.yahoo.com http://www.lycos.com http://www.metacrawler.com http://www.alltheweb.com http://www.vinaseek.com http://www.panvietnam.com
26. 26. Introduction to Internet 2606/18/15 Google Truy vn tm kim Kch chut vo y bt u tm.
27. 27. Introduction to Internet 2706/18/15 Kt qu tm kim vi Google
28. 28. Introduction to Internet 2806/18/15 Vn thng gp khi tm kim V d: Tm kim thng tin v gio s Michael. Tm kim thng tin v tuyt l Colorado. Vn : khng c c thng tin mong mun do: Kt qu tm c qu nhiu. Kt qu tm c qu t. Cc kt qu khc vi mong i. Gii php: S dng t kha hp l (tra t in chuyn ngnh). S dng cc k php truy vn (tm kim nng cao).
29. 29. Introduction to Internet 2906/18/15 Ton t logic (Boolean) NOT, AND, OR poverty AND crime poverty AND crime AND gender college OR university college OR university OR campus food AND NOT pet
30. 30. Introduction to Internet 3006/18/15 K php truy vn ca Google Cp du nhy kp : Tm kim mt cm t. Vd: agriculture library. Du cng (+): AND; Mc nh vi Google. agriculture library = agriculture + library. Du tr (-): NOT. Du phy: OR. Du ~: Tm kim ng ngha. Vd: ~food ~facts s nhc Google tm c nutrition, cooking. Tm kim tp (filetype:) Tham kho thm: http://www.google.com.vn/advanced_search http://www.google.com/help
31. 31. Introduction to Internet 3106/18/15 c kt KEYWORD QUERY SEARCH ASSESMENT Refinement
32. 32. Introduction to Internet 3206/18/15 V d p dng Colorado avalanche? ASEM 5? John Kerry? Bolton Wanderers? Internet history? Michael Jackson? Nobel 2004.
33. 33. Introduction to Internet 3306/18/15 Cc dch v tra cu v tm kim khc Web directory http://dir.yahoo.com http://danhba.vdc.com.vn Encyclopedia http://encarta.microsoft.com http://www.britannica.com/ T in tra cu http://www.computerhope.com Catalog http://www.nlv.gov.vn http://agricola.nal.usda.gov C s d liu tm tt http://www.citeseer.org (http://citeseer.ist.psu.edu/) min ph http://www.ingenta.com http://www.cabi-publishing.org
34. 34. Introduction to Internet 3406/18/15 Cc dch v khc Instant Messenger: Cho php chng ta ni chuyn vi nhau thng qua vic gi cc messages. Vd: America Online Messenger, Yahoo Messenger. Internet Phone: Cho php gi in thoi qua mng Internet. Nh cung cp: FPT, OneConnection, Viettel, VDC,... Internet Games, Greeting Card,
35. 35. Introduction to Internet 3506/18/15 Thng mi in t (e-commerce) L thng mi trong mi trng in t S h tr ca cng ngh in t, c bit l Internet. Mua hng v thanh ton qua Internet (Credit, Master Card,...). Mt vi a ch mua bn qua mng: Amazon: http://www.amazon.com. Ebay: http://www.ebay.com. Mua my tnh ti IBM: http://www.ibm.com. Tm kim hng ha, kho gi: http://www.shopping.com. VDC Tin Phong: http://vdcsieuthi.vnn.vn.
36. 36. Introduction to Internet 3606/18/15 Computer viruses Virus (VR) Chng trnh my tnh c mc ch ph hoi hoc trc li C kh nng ly lan t my tnh ny sang my tnh khc. Ai vit ra VR? Thanh thiu nin. Sinh vin v mt s thnh phn khc. Mc ch ca ngi vit VR: Mun chng t mnh. Ph hoi, nh cp thng tin (ti khon ngn hng, ti khon Internet, cc thng tin b mt,). Cc VR nguy him hin nay ly lan ch yu qua mi trng mng vi tc khng khip.
37. 37. Introduction to Internet 3706/18/15 Nguy c b nhim VR MT c th b nhim VR khi: Khi ng my tnh t mt a mm nhim VR (ngy xa). Chy mt chng trnh b nhim VR bng cch ny hay cch khc. VR n nu u: Cc my tnh b nhim. Cc trang web nguy him. Cc tp nh km trong th in t (rt ph bin). Cc tp chng trnh (*.exe) Cc tp khng phi chng trnh (*.jpg, *.doc, *.xls)!!! Ly lan qua mng: Tn cng qua l hng ca h thng (Vd: Windows W32.Blaster). Mt my tnh b nhim VR c th ly sang cc my khc trong mng.
38. 38. Introduction to Internet 3806/18/15 Phng v chng VR Phng nga: Ci t mt chng trnh bo v: Norton AntiVirus, McAfee Virus Scan, BKAV, (http://www.symantec.com,..). S dng my tnh mt cch an ton: cn thn khi duyt web, nhn th, hy qut VR cc a mm, cc tp l trc khi s dng chng. Thng xuyn cp nht thng tin v VR, cp nht chng trnh qut VR, nh k qut VR trn my tnh. Khi my tnh b nhim VR: Qut VR bng chng trnh c cp nht. Truy cp cc websites bo mt (http://www.symantec.com, http://www.bkav.com.vn) Xc nh loi VR b nhim. Hng dn chi tit cch dit loi VR b nhim. Ti v cc Removal Tools. Hi kin chuyn gia.