M hnh tham chiu(reference model)

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Ni dungTng quan v cc m hnh tham chiuM hnh tham chiu OSIM hnh tham chiu TCP/IPTng quan gia OSI v TCP/IP

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015M hnh tham chiuL m hnh chun v l thuyt xy dng cc h thng truyn thng (communication system).M hnh tham chiu dng m t cc chc nng ca h thng.M hnh tham chiu gip cc h thng khc nhau c th kt ni c vi nhau.

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Ti sao phi dng m hnh tham chiu?Qu trnh truyn d liu t my tnh ny qua my tnh kia l mt qu trnh phc tp, cn phi phn chia thnh nhiu cng on (module).Cc h thng khc nhau c cu trc v hot ng khc nhau, do cn phi c m hnh chun.

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015M hnh tham chiu c xy dng nh th no?L h thng phn lp, mi lp ng vi mt module ca qu trnh truyn thng.Lp trn (lp n+1) s dng dch v ca lp di (lp n):Lp n gi l service providerLp n+1 gi l service user.

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015M hnh tham chiu c xy dng nh th no?Lp n+1Lp nLp n-1PDUPDUPDU

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015M hnh OSIVo nm 1977, ISO c giao nhim v thit k mt chun truyn thng da trn l thuyt v kin trc h thng m lm c s thit k h thng mng my tnh. M hnh ny c tn l OSI (Open System Interconnection: tng kt cc h thng m).

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015M hnh OSIc ISO (International Standardization Oganization) chun ha nm 1984.Gm 7 lp (layers).L m hnh thun l thuyt, c s dng rng ri nht hin nay.Cha hon thin v mt thc hin, mt s lp cha c ng dng (lp 5, lp 6)

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015M hnh OSI

Mng my tnh - Toi

Cc ng dng mng: email, web, chat,...nh dng biu din d liu, encryption, Thit lp session, security, authenticationBo m truyn nhn ng d liuQun l a ch, tm ng, truyn nhn cc packet.Truyn nhn frame, kim tra v sa liKt ni vt l, truyn cc bit d liuCc lp ca m hnh OSIDNTU, 2015Mng my tnh - Toi*

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015M hnh OSI

Mng my tnh - Toi

Qui trnh ng gi v gi d liu qua mng:D liu do con ngi to ra trn lp 7 nh voice, video, data.Phn cng v phn mm s chuyn d liu do con ngi to ra xung lp vt l v chuyn qua mi trng mng.DNTU, 2015Mng my tnh - Toi*M hnh tham chiu OSI

Mng my tnh - Toi

Cc dch v lp ng dng s khi to qu trnh truyn d liu.

DNTU, 2015Mng my tnh - Toi*M hnh tham chiu OSI

Mng my tnh - Toi

DNTU, 2015Mng my tnh - Toi*M hnh tham chiu OSI

Mng my tnh - Toi

DNTU, 2015Mng my tnh - Toi*M hnh tham chiu OSISau , d liu c chuyn t lp ng dng xung lp vt l. Mi khi i qua mt lp, d liu s c chn thm thng tin iu khin. Qu trnh ny gi l ng gi d liu.

Mng my tnh - Toi

DNTU, 2015Mng my tnh - Toi*M hnh tham chiu OSI

Mng my tnh - Toi

Sau khi chuyn d liu n ch, ti ch din ra qu trnh gii ng gi d liu. D liu c chuyn lp vt l ln lp ng dng, mi khi qua mt lp cc thng tin iu khin c bc tch. Dch v lp ng dng hin th thng tin ny ln cho con ngi s dng.

DNTU, 2015Mng my tnh - Toi*M hnh tham chiu OSI

Mng my tnh - Toi

GIAO TIP QUA M HNH OSIApplicationPresentationSessionTransportNetworkData LinkPhysicalApplicationPresentationSessionTransportNetworkData LinkPhysical10010111001011010010110101011110101segmentspacketsframesDataDNTU, 2015Mng my tnh - Toi*

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp vt l (physical layer): nh ngha giao tip phn cng (mi trng truyn dn, kch c u ni, ).c tnh tn hiu (mc in, tc truyn, )Truyn chui bit khng c cu trc (unformatted bit stream) gia cc thit b u cui.

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp lin kt d liu (Data link layer): Thc hin vic truyn d liu gia hai thit b u cui trn mt lin kt (link-by-link).D liu c x l di dng cc khung d liu (data frame) c cu trc n gin.Thc hin chc nng kim tra li mc thp.iu khin vic truy xut mi trng truyn.

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp lin kt d liu (Data link layer):+ Lp ny lin quan n:

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp lin kt d liu (Data link layer):

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp mng (Network layer): Giao tip gia thit b u cui vi mng (network interface).Kt ni cc mng li vi nhau (internetworking).Thc hin chc nng nh v (addressing) v nh tuyn (routing).

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp mng (Network layer):

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp vn chuyn (Transport layer): Truyn d liu mt cch tin cy gia hai h thng u cui trn mng (end-to-end).Phn bit vi c ch link-by-link ca lp lin kt d liu. Thc hin cc chc nng kim tra v sa li mc cao (error control, flow control, sequencing, ).

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp phin (Session layer): Qun l cc giao dch (session) gia cc h thng u cui, bao gm: thit lp, duy tr v gii ta cc giao dch.

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp phin (Session layer):

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSI

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp phin (Session layer):

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp trnh by (Presentation layer): bin dch c php d liu ca cc h thng khc nhau thnh dng chun sao cho cc h thng u cui c th hiu c.

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp trong m hnh OSILp ng dng (Application layer): cung cp cc giao thc ng dng lm c s cho dch v m h thng cung cp cho ngi s dng nh web, mail, chat, Ch : lp ng dng khng cung cp dch v trc tip cho ngi dng (human users)

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015TelnetFTP, HTTP, DNSASCIIEBCDICJPEGPhn bit d liu ca cc giao dch khc nhauCung cp dch v mngTrnh by d liuM ha d liuOperating System/Application Access SchedulingV dSessionPresentationApplicationTm tt chc nng cc lp trong m hnh OSI

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015TCPUDPSPX802.3 / 802.2HDLCEIA/TIA-232 V.35IPIPXV dTm tt chc nng cc lp trong m hnh OSITransport Data LinkPhysical Truyn d liu iu khin v sa saiChuyn d liu dng khungKim sat li mc thpiu khin truy xut mi trngChi tit giao tip vt lTruyn chui bt khng cu trcNetwork nh tuyn nh v

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015M hnh TCP/IPc pht trin nm 1974, cn c gi l m hnh DoD (Department of Defense).M hnh TCP/IP l m hnh vn hnh ca mng Internet, do c tnh thc tin cao hn.TCP/IP gm 4 lp, c s tng thch tng i vi m hnh OSI

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp ca m hnh TCP/IPApplicationTransportInternetworkNetwork interfaceLp ng dngLp vn chuynLp lin kt mngLp giao tip mng4321

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp ca m hnh TCP/IPLp giao tip mng (Network interface):C chc nng tng ng vi lp Vt l v lp Lin kt d liu trong m hnh OSI.M hnh TCP/IP khng xc nh c th cc chi tit ca lp ny m da vo nh ngha ca cc chun khc (nh Ethernet, HDLC, )

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp ca m hnh TCP/IPLp lin kt mng (Internetwork):Tng ng chc nng ca lp Mng trong m hnh OSI.Thnh phn chnh ca lp Internetwork l giao thc IP

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp ca m hnh TCP/IPLp Vn chuyn (Transport):Tng ng lp Vn chuyn trong m hnh OSI.Thnh phn ch yu ca lp Vn chuyn l hai giao thc TCP (Transmission Control Protocol) v UDP (User Datagram Protocol).

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015Cc lp ca m hnh TCP/IPLp ng dng (Application):Tng ng vi lp ng dng ca m hnh OSI.S lng cc dch v mng khng ngng tng ln, cc giao thc lp mng cng phi c thng xuyn cp nht. Mt s giao thc in hnh lp ng dng: DNS, FTP, HTTP, SMTP, POP, TELNET,

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015TransportInternetLinkApplicationTelnetFTPSMTPDNSRIPSNMPIPARPCc thnh phn ca TCP/IP

Mng my tnh - Toi

Mng my tnh - Toi*DNTU, 2015TCP/IP Protocol SuiteTCP/IPOSIQuan h gia OSI v TCP/IPTCPUDPARPIGMPICMPIPApplicationTransportLinkTelnetFTPSMTPDNSRIPSNMPApplicationTransportNetworkData-LinkPresentationSessionPhysicalInternet

Mng my tnh - Toi

*Slide 3 of 4:Purpose: This figure orients the students to the session layer.Emphasize:This layer coordinates applications as they interact on different hosts. Examples of session-layer protocols include: NFS, SQL, RPC, and so on.Transition: The following displays the lower layers.*Slide 4 of 5:Purpose: This figure orients the students to the transport layer.Emphasize:The Transport layer of the OSI reference model is implemented by various protocols; one of which is TCP. TCP uses ports and encapsulates the data in segments. TCP is connection oriented so it offers reliable service. The other major transport layer protocol discussed in this course is UDP. It offers speed but no reliability because it is connectionless. Transition: The following presents the entire OSI stack again.