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Chuong 2 - Co ban ve mang may tinh va truyen thong

Course: MATH 6046, Spring 2012
School: MIT
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2: Cc Chng khi ni m c b n v m ng my tnh Khoa CNTT- HBK H N i Gi ng vin: Ng H ng Sn B mn Truy n thng v M ng my tnh 1 Tu n tr c Gi i thi u mn h c L c s Internet Khi ni m m ng my tnh M t s v n c b n: chuy n m ch knh vs. chuy n m ch gi, h ng lin k t vs. khng lin k t 2 N i dung Ki n trc phn t ng M hnh tham chi u OSI & TCP/IP a ch ha Tn mi n v chuy n i tn mi n 3 Ki n trc phn t ng V d T i sao ph i phn t...

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2: Cc Chng khi ni m c b n v m ng my tnh Khoa CNTT- HBK H N i Gi ng vin: Ng H ng Sn B mn Truy n thng v M ng my tnh 1 Tu n tr c Gi i thi u mn h c L c s Internet Khi ni m m ng my tnh M t s v n c b n: chuy n m ch knh vs. chuy n m ch gi, h ng lin k t vs. khng lin k t 2 N i dung Ki n trc phn t ng M hnh tham chi u OSI & TCP/IP a ch ha Tn mi n v chuy n i tn mi n 3 Ki n trc phn t ng V d T i sao ph i phn t ng? 4 Phn chia cc ch c nng trong vi c trao i thng tin Bn g i Bn nh n Thng tin mu n trao i Thng tin nh n c Chuy n t suy ngh sang l i ni Ngn ng Japanese? English? Ngn ng Cc phng ti n truy n thng Th? i n tho i? E-mail? Vi c trao i thng tin s di n ra sun s n u t i m i t ng, cng m t phng ti n c s d ng 5 V d phn t ng (1) Phn t ng Khng phn t ng Cassette B dn m thanh Player Speaker Amplifier T t c ch c nng u t c trong m t kh i Khi mu n thay i: 6 Nng c p ton b Phn t ng cc ch c nng hng khng ticket (purchase) ticket (complain) ticket baggage (check) baggage (claim) baggage gates (load) gates (unload) gate runway (takeoff) runway (land) takeoff/landing airplane routing airplane routing airplane routing Sn bay i airplane routing airplane routing Sn bay trung chuy n Sn bay n T ng: M i t ng c nhi m v cung c p 1 d ch v D a trn cc ch c nng c a chnh t ng D a trn cc d ch v cung c p b i t ng d i 7 V sao ph i phn t ng? i v i cc h th ng ph c t p: nguyn l chia tr Cho php xc nh r nhi m v c a m i b ph n v quan h gi a chng Cho php d dng b o tr v nng c p h th ng Thay i bn trong m t b ph n khng nh h ng n cc b ph n khc e.g., Nng c p t CD ln DVD player m khng ph i thay loa. 8 Cc m hnh tham chi u M hnh OSI M hnh TCP/IP 9 OSI - Open System Interconnection: Bao g m 7 t ng Application layer T ng ng d ng Presentation layer T ng trnh di n Session layer T ng phin Transport layer T ng giao v n Network layer T ng m ng T ng lin k t d Data link layer li u T ng v t l Physical layer H th ng cu i T ng m ng Nt m ng trung gian H th ng cu i 10 Ch c nng chung c a cc t ng V t l: Truy n bits trn ng truy n Lin k t d li u: Truy n d li u gi a cc thnh ph n n i k t trong m t m ng M ng: Ch n ng, chuy n ti p gi tin t ngu n n ch Giao v n: X l vi c truy n-nh n d li u cho cc ng d ng Phin: ng b ha, check-point, khi ph c qu trnh trao i Trnh di n: cho php cc ng d ng bi u di n d li u, e.g., m ha, nn, chuy n i ng d ng: H tr cc ng d ng trn m ng. application presentation session transport network data link physical 11 M hnh OSI v TCP/IP Trong m hnh TCP/IP (Internet), ch c nng3 t ng trn c phn nh vo m t t ng duy nh t Application layer Presentation layer Application HTTP, FTP, SMTP Session layer Transport layer TCP UDP Network layer IP Datalink layer Network Interface Physical layer Physical 12 M hnh phn t ng c a Internet V d v qu trnh g i d li u t ngu n, qua nt trung gian (b nh tuy n) r i n ch FTP FTP TCP TCP IP Ethernet/10M CAT5 Ngu n IP IP 10M 100M CAT5 CAT5 Nt trung gian 100M/Ethernet CAT5 ch 13 ng gi d li u (Encapsulation) Gi qu Trang tr Dn a ch a ch a ch 14 PDU: Protocol Data Unit n v d li u giao th c Protocol N+1 Layer (N+1) (N+1) PDU Service interface Protocol N Layer (N) (N) PDU HN Service interface Protocol N-1 addr. Layer (N-1) (N-1) PDU HN HN-1 15 H giao th c TCP/IP v qu trnh ng gi Bn g i M i t ng thm vo cc thng tin i u khi n vo ph n u gi tin (header) v truy n xu ng t ng d i Bn nh n M i t ng x l gi tin d a trn thng tin trong ph n u, sau b ph n u, l y ph n d li u chuy n ln t ng trn. ExHTTP header Data Application Application Data TCP header TCP TCP IP header IP IP Network Interface Network Interface Physical Physical Ethernet Frame Signal 16 Sender Receiver SAP: Service Access Point i m truy nh p d ch v Protocol 1 Server 1 Client 1 Client 2 Server 3 Application Protocol 1 Protocol 1 Server 2 Client 3 SAP Network SAP TCP/UDP TCP/UDP TCP/UDP protocol Internet 17 Protocol stack v qu trnh ng gi FTP FTP TCP TCP IP IP Ethernet/10M CAT5 End node 10M IP IP 10G CAT5 WDM Ethernet/100M 10G WDM CAT5 Intermediate node D CAT5 End node li u - payload 18 Protocol stack v qu trnh ng gi FTP FTP TCP TCP IP IP Ethernet/10M CAT5 End node 10M IP IP Ethernet/100M 10G 10G CAT5 WDM WDM CAT5 Intermediate node TCP header CAT5 End node D li u - payload 19 Protocol stack v qu trnh ng gi FTP FTP TCP TCP IP IP Ethernet/10M CAT5 End node 10M IP IP 10G CAT5 WDM Ethernet/100M 10G WDM CAT5 Intermediate node IP header TCP header CAT5 End node D li u - payload 20 Protocol stack v qu trnh ng gi FTP FTP TCP TCP IP IP Ethernet/10M CAT5 End node 10M IP IP 10G CAT5 WDM Ethernet/100M 10G WDM CAT5 Intermediate node Ethernet header IP header TCP header CAT5 End node D li u - payload 21 Protocol stack v qu trnh ng gi FTP FTP TCP TCP IP IP Ethernet/10M CAT5 End node 10M IP IP 10G CAT5 WDM Ethernet/100M 10G WDM CAT5 Intermediate node IP header TCP header CAT5 End node D li u - payload 22 Protocol stack v qu trnh ng gi FTP FTP TCP TCP IP IP Ethernet/10M CAT5 End node WDM header 10M IP IP 10G CAT5 WDM Ethernet/100M 10G WDM CAT5 Intermediate node IP header TCP header CAT5 End node D li u - payload 23 Protocol stack v qu trnh ng gi FTP FTP TCP TCP IP IP Ethernet/10M CAT5 End node 10M IP IP 10G CAT5 WDM Ethernet/100M 10G WDM node IP CAT5 Intermediate header TCP header CAT5 End node D li u - payload 24 Protocol stack v qu trnh ng gi FTP FTP TCP TCP IP IP Ethernet/10M CAT5 End node 10M IP IP 10G CAT5 WDM Ethernet/100M 10G WDM CAT5 Intermediate node Ethernet header IP header TCP header CAT5 End node D li u - payload 25 Protocol stack v qu trnh ng gi FTP FTP TCP TCP IP IP Ethernet/10M CAT5 End node 10M IP IP 10G CAT5 WDM Ethernet/100M 10G WDM CAT5 Intermediate node IP header TCP header CAT5 End node D li u - payload 26 Protocol stack v qu trnh ng gi FTP FTP TCP TCP IP IP Ethernet/10M CAT5 End node 10M IP IP 10G CAT5 WDM Ethernet/100M 10G WDM CAT5 Intermediate node TCP header CAT5 End node D li u - payload 27 Protocol stack v qu trnh ng gi FTP FTP TCP TCP IP IP Ethernet/10M CAT5 End node 10M IP IP 10G CAT5 WDM Ethernet/100M 10G WDM CAT5 Intermediate node CAT5 End node D li u - payload 28 Tm t t: u i m c a ki n trc phn t ng Chia nh cho php xc nh d dng ch c nng m i t ng Cc t ng ho t ng c l p T ng trn ch quan tm n vi c s d ng t ng d i m khng quan tm n cc t ng xa hn Cho php nh ngha giao di n chung gi a cc t ng Kh nng m r ng M m d o, linh ho t v i cc cng ngh m i Trao i gi a cc t ng ng m c C th c i ti n h th ng b ng cch thay th m t cng ngh m i c a t ng tng ng : ISDNADSLFTTHIPv4IPv6 N u khng phn t ng Khi mu n thay i, ph i lm ton b 29 Cc nh danh trn Internet a ch MAC a ch IP S hi u c ng 30 nh danh Cc nh danh cho php xc nh m t ng i hay m t i t ng Tn Nguyen Thuc Hai a ch 1 Dai Co Viet, Hai Ba Trung, Ha Noi S i n tho i 8680896 Email hai--xxx@it.hut.edu.vn 31 nh danh v cy phn c p Cc nh danh xc nh a ch c tnh phn c p Cho php qu n l m t cc logic v hi u qu m t khng gian a ch kh ng l Tnh m r ng V d v tnh phn c p Hanoi a ch 1 Dai Co Viet, Hai Ba Trung, Ha Noi Hai Ba Trung S i n tho i +84-(4) 868-08-96 Dai Co Viet So 1 32 nh danh trn Internet v quan h v i cc t ng application Port Number, e.g. Port 80 TCP/UDP IP data link IP address, e.g. 203.12.15.165 Physical address / MAC address e.g. 00:11:24:79:8e:82 physical 33 a ch dng trong t ng lin k t d li u a ch v t l / a ch MAC S d ng trong t ng lin k t d li u C nh trn card m ng NIC ( Network Interface Card) S d ng a ch ha my tnh trong cc m ng qu ng b HEX 00:11:24:79:8e:82 BIN 00000000 00010001 00100100 01111001 OUI 10001110 10000010 Gn b i nh s n xu t OUI (Organizationally Unique Identifier): M nh s n xu t M i nh s n xu t c cc gi tr OUI ring 34 M i nh s n xu t c th c nhi u OUI a ch dng trn Internet a ch IP Dng trong giao th c IP - Internet Protocol (t ng m ng) Gi tr ph thu c t ng m ng, m i card m ng c gn m t a ch IP S d ng inh danh m t my tnh trong m t m ng IP, v d : 133.113.215.10 (ipv4) 2001:200:0:8803::53 (ipv6) 35 a ch s d ng trong t ng giao v n S hi u c ng M t ch s ph , dng km theo a ch IP Cc ng d ng c d nh danh b i m t a ch IP v m t s hi u c ng Tng t nh s phng trong m t ta nh a ch nh : Nh C1, 1 Dai Co Viet, Ha Noi => a ch IP Phng s 325 => S hi u c ng E.g. HTTP c ng 80, FTP c ng 20, 21 36 nh x a ch Tn mi n Chuy n i tn mi n nslookup arp 37 Tn mi n Domain Name (FQDN: Fully Qualified Domain Name) Tn mi n l tn c a m t my tnh hay c a m t m ng my tnh, s d ng tn (ch ci, ch s ) www.keio.ac.jp www.hedspi.hut.edu.vn .hut.edu.vn 38 Khng gian tn mi n pc24.cs.keio.ac.jp .keio.ac.jp 39 Tn v a ch Tr c khi truy n tin, my tr m ph i c xc nh B i m t a ch IP, ho c B i m t tn mi n (thu n ti n cho NSD) Tn di thay i D nh cho con ng i Khng lin quan t i v tr v t l c a my a ch di c nh D cho my tnh x l Lin quan t i v n ch n ng 203.162.7.194 www.hut.edu.vn www.hedspi.hut.edu.vn 202.47.142.40 40 Chuy n i a ch v v d My tnh thch dng s Ng i thch dng tn Ti mu n vo a ch www.hedspi.hut.edu.vn User C n c chuy n i a ch M i truy c p vo 202.47.142.40 My ch tn mi n My ch web 202.47.142.40 B n cng c th nh p a ch tr c ti p 41 Chuy n i a ch Khi ni m C ch cho php tm m t a ch IP t ng c l i m t tn mi n v My ch tn mi n M t phng th c c s d ng chuy n i a ch c s d ng r ng ri trn Internet 42 V d NSD (1) (2) My ch tn mi n www.hedspi.hut.edu.vn (3) 202.47.142.40 www.hedspi.hut.edu.vn Trnh duy t web (4) 202.47.142.40 My ch web Cung c p nh x tn- a ch 43 Cng c nslookup Nh p tham s www.hedspi.hut.edu.vn Chuy n i Tn a ch c th c hi n l nh nslookup nslookup www.hedspi.hut.edu.vn C:\Documents and Settings\hongson>nslookup www.hedspi.hut.edu.vn Server: Address: 192.168.1.1 Non-authoritative answer: Name: www.hedspi.hut.edu.vn Address: 202.47.142.140 C:\Documents and Settings\hongson> 44 ARP chuy n i a ch v t l a ch IP Address Resolution Protocol M t giao th c tm a ch v t l t a ch IP 32bit IP address ARP RARP 48bit MAC address 45 V d : ARP table (Trn Windows) C:\Documents and Settings\hongson>arp -a IP address Interface: 192.168.1.34 --- 0x2 Internet Address Physical Address Type 192.168.1.1 00-02-cf-75-a1-68 dynamic 192.168.1.33 08-00-1F-B2-A1-A3 dynamic C:\Documents and Settings\hongson> MAC address 46 Tm t t Ki n trc phn t ng T i sao ph i phn t ng M hnh TCP/IP vs. m hnh OSI Encapsulation, PDU. SAP a ch trn Internet a ch IP, a ch MAC, tn mi n, s hi u c ng Chuy n i a ch 47 Tu n t i Nguyn l chung c a t ng m ng Giao th c IP Chi ti t hn v a ch IP X l gi tin IP t i t ng m ng Giao th c ICMP 48
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