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[PDF] Cours DNS : introduction generale sur le systeme | Cours reseau

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(8) DNS : généralités (2) ❍. $YDQWDJHV ‡ *HVWLRQGpFHQWUDOLVpH ² DGPLQLVWUDWLRQGHVVHXOHVUHVVRXUFHVORFDOHV ² PDLVDFFqVjWRXWHVOHVUHVVRXUFHVGHO ,QWHUQHW ‡ 6\VWqPHGHFDFKH PpPRULVHUOHVUpVROXWLRQVSUpFpGHQWHV ‡ JDLQGHWHPSV ‡ SDVGHVXUFKDUJHLQXWLOHGXUpVHDX ‡ '16V\VWqPHODUJHPHQWUpSDQGXELHQU{GpHWVWDQGDUG. DNS : généralités (3) ❍. ,QFRQYpQLHQWV ‡ 3UREOqPHGHFHUWLILFDWLRQGHO LQIRUPDWLRQ ² OHVGRQQpHVFKDQJHQWOHQWHPHQW ‡ OHVFRXSOHV QRPV#,3

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(10) DNS : la théorie (1) ❍. &RQVWLWXDQWVGX'16 ‡ / (VSDFHGHV1RPVGHGRPDLQHVHWOHVLQIRUPDWLRQV DIIpUHQWHV 5HVRXUFH5HFRUGVRX55

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(16). . ‡ OHVQRPVGHGRPDLQHGHFHWWHVXLWHVRQWVpSDUpVSDUXQ  ² ([HGX. -XVVLHXIU. Page 5. IU. FQUVIU.

(17) DNS : la théorie (3) ❍. ❍ ❍. ❍. /HQRPPDJHSHXWDXVVLrWUHUHODWLI ‡ FHODVXSSRVHTXHO 25,*,1(VRLWFRQQXH ‡ ([VKLYDMXVVLHX HVWXQQRPUHODWLIDXGXGRPDLQH)5 ² RQGLWTXH)5HVWO RULJLQHFRXUDQWH XQQRPGHGRPDLQH UHODWLIRXDEVROX

(18) HVWOLPLWpjFDUDFWqUHV XQGRPDLQHHVWLGHQWLILpSDUXQ1RPGHGRPDLQH F HVWODVRXVDUERUHVFHQFHTXLDSRXURULJLQHFHQRPGHGRPDLQH 8QGRPDLQHLQFOXVGDQVXQDXWUHHVWXQVRXVGRPDLQH ‡ ([SUHSDLPLWHGXHVWVRXVGRPDLQHGH ² DLPLWHGX ² PLWHGX ² HGX ² . DNS : la théorie (4) ❍. 4XHO1RPGH'RPDLQHFKRLVLU" ‡ 5)& ‡ FDUDFWqUHVPD[ FRQVHLOOpFDUDFWqUHVPD[

(19) ‡ $=D] ‡ GRLWFRPPHQFHUSDUXQHOHWWUH. ❍. OHJpUDQWGXGRPDLQHHQJOREDQWOHY{WUHGRLWDVVXUHUO XQLFLWpGHV QRPVGHGRPDLQH ‡ O 85(&SRXUXQVRXVGRPDLQHGH&156)5 ‡ OH$)1,&SRXUXQVRXVGRPDLQHGH)5 ‡ . Page 6.

(20) L’Espace des Noms "". (Root). Autres Pays. USA .com .edu. .mit. lcs. .mil .gov. .ddn. nic. .arpa .org. .net. .nordu. nic. .fr .uk .de .nl .au .jp. .edf. .urec. .der. .vjf. isis. compta. •••. .ac. soleil. DNS : administration (1) ❍. / DGPLQLVWUDWLRQGHVQRPVGHGRPDLQHHVWKLpUDUFKLVpH ‡ /H1,& 1HWZRUN,QIRUPDWLRQ&HQWHU

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(25) ‡ 3RXUIDLUHHQUHJLVWUHUXQQRPGHGRPDLQHVRXVIU ‡ 3RXUIDLUHRXYULUOD]RQHFRUUHVSRQGDQWH. ❍. &RQWDFWHUOH*,35HQDWHU GQVVYS#UHQDWHUIURXZZZUHQDWHUIU

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(27) ‡ 3RXUIDLUHHQUHJLVWUHUXQQRPGHGRPDLQHVRXVFQUVIU ‡ 3RXUIDLUHRXYULUOD]RQH;FQUVIU. Page 8.

(28) DNS : la théorie (6) ❍. ,OQ \DSDVGHFRUUHVSRQGDQFHV\VWpPDWLTXHHQWUHXQQRPGH GRPDLQHHWXQHDGUHVVHGHUpVHDX,3 ‡ /HQRPHVWXQHQRWLRQDGPLQLVWUDWLYH ‡ /HGRPDLQHFQUVGLUIUUHJURXSHVLWHVj3DULVHWVLWHj 7RXORXVH. ❍ ❍. ,O\DXQHKLpUDUFKLHGHVQRPVGHGRPDLQHV FRQWUDLUHPHQWDX[DGUHVVHVGHUpVHDX[. DNS : la théorie (7) / HVSDFHGHV1RPVHWOHVUHTXrWHVLQYHUVHV ❍. UpDOLVHUODFRUUHVSRQGDQFH#,3!QRP ‡ QRPGHPDFKLQHRXGHUpVHDX

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(30) Le pseudo domaine in-addr.arpa.  $USD. )U. ,QDGGU . -XVVLHX. 8UHF. 6KLYD. 7HWK\V.   . PTR.  . DNS : la théorie (8) /HV5HVRXUFH5HFRUGV 55V

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(33) Sructure d’un RR. 3URSULpWDLUH. 77/. &/$66(. 1RPGH'RPDLQH  LPSOLFLWH

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(37) 1RPB'RP 1RPBKRVW 1RPBKRVW 1RPBKRVW 7H[WH 6HUYLFHV. DNS : la théorie (10) ❍. ([HPSOHVGH5HVRXUFH5HFRUGV 3URSULpWDLUH. &ODVVH 7\SH. ,6,('8. ,1. 0;. . $ $. 9(1(5$,6,('8. Page 11. 5'$7$ . 9(1(5$,6,('8  .

(38) Alias et noms canoniques. 3URSULpWDLUH. &ODVVH7\SH. 5'$7$. /DIRULDLESIU,1 $ .OHLRLESIU &1$0(.  /DIRULDLESIU. WHWK\VXUHFIU QVXUHFIU IWSXUHFIU.  WHWK\VXUHFIU WHWK\VXUHFIU. . $ &1$0( &1$0(. DNS : la théorie (12) $OLDVHWQRPVFDQRQLTXHV ❍. 8QQRPGH'RPDLQHQHGRLWMDPDLVSRLQWHUVXUXQDOLDVPDLVVXUXQ 1RPFDQRQLTXH. ❍. ([ ‡ LQDGGUDUSD,1375. Page 12. /DIRULDLESIU.

(39) DNS : la théorie (13) ❍. 3DUDPqWUHVGX62$ 5)&

(40) ¬ ■ Serial ■ Refresh ■ Retry ■ Expire ■ Minimum. ❍. No de version Intervalle entre 2 polling des serveurs 2daires Intervalle si polling infructueux Durée de l'autorité sur la zone Durée de vie (TTL) des RR dans un cache. ([HPSOH ‡ . 9HUVLRQ. ‡. . 5HIUHVK K

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(46) DNS : les ZONES (2) 'pILQLWLRQV ❍ XQH=21(HVWGpOLPLWpHSDUOHVSDUWLHVFRQWLJHVGHO DUEUHGHV QRPVGHGRPDLQHVXUOHVTXHOOHVXQ16SRVVqGHXQHLQIRUPDWLRQ FRPSOqWH ❍. F HVWOHVRXVDUEUHJpUpSDUXQHHQWLWpDGPLQLVWUDWLYHSDUWLFXOLqUH / DXWRULWpVXUFHVRXVDUEUH FHWWH=RQH

(47) OXLDpWpGpOpJXpH. ❍. ODGpOpJDWLRQHVWWRWDOH ‡ SHXWFKDQJHUO RUJDQLVDWLRQGXVRXVDUEUHGRQWLODODFKDUJH VDQVSUpDYLV ‡ SHXWGpOpJXHUXQHSDUWLHGHOD=RQHjXQHDXWUHHQWLWpVRXV ]RQH. DNS : les ZONES (3). ❍. /HQRPGHOD=RQH 1RPGXQRHXGVRPPLWDO ‡ QRHXGVRPPLWDO QRHXGOHSOXVpOHYpGHODVRXVDUERUHVFHQFH. ❍. FRXSXUH HQWUH]RQHV

(48)  ‡ Q LPSRUWHRHQWUHQRHXGVDGMDFHQWVGHO DUEUH ‡ WRXVOHVQRHXGVG XQH]RQHGRLYHQWrWUHUHOLpVHQWUHHX[ !IUDJPHQWDWLRQGHODEDVHGHGRQQpHJpQpUDOH !SOXVJUDQGHIDFLOLWpG DGPLQLVWUDWLRQ !PDLV. Page 14.

(49) DNS : les ZONES (4) =RQH5RRW.  =RQH)5 )5 =RQH,15,$. =RQH,%3. ,15,$. &RUWRQ/D\RQ. =RQH85(& ,%3. (FROH'RF0$6,/DIRULD. 85(&. 7HWK\V 3KRHEH. -XSLWHU +HUPHV.OHLR. DNS : les ZONES (5) &UpDWLRQG XQHQRXYHOOH=RQH 5)&

(50) ❍. REWHQLUODGpOpJDWLRQGHFHWWHQRXYHOOH]RQH ‡ DXSUqVGXJpUDQWGHOD]RQHPqUH ‡ ]RQHPqUH]RQHTXLLQFOXWODQRXYHOOH]RQH HUQLYHDX

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(52) DNS : Les Serveurs de Noms (1) ❍. 1DPH6HUYHUV 16

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(59) ‡ OHV#,3GHV16GHOD]RQH5RRW TXLFRQQDLVVHQWO #,3GHV16GHVVRXV]RQHVDGMDFHQWHV ('81(7&20)58.1/. Page 16.

(60) DNS : Les Serveurs de Noms (3) 5pVROXWLRQVGHVUHTXrWHV ❍. PRGHLWpUDWLI PLQLPDOHWREOLJDWRLUH

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(62)   !5pSRQVH ^'DWD_(UUHXU`. DNS : Les Serveurs de Noms (4) ❍. /RUVTX XQVHUYHXUUHoRLWXQHUHTXrWH ‡ LOUpSRQGDXFOLHQWVL ² LODO LQIRUPDWLRQGDQVVHVWDEOHV ² RXGDQVVRQFDFKH ‡ VLQRQLOFRQVWUXLWXQH GHV

(63) UHTXrWHVSRXUOHV16VXFFHVVLIV HQ FRPPHQFDQWSDUFHX[GHOD]RQH5RRW

(64) HW ² VRLWWUDQVPHWODUpSRQVHjO DXWHXUGHODUHTXrWH PRGH UpFXUVLI

(65) ² VRLWWUDQVPHWO #,3GX16jLQWHUURJHU ² O DXWHXUGHODUHTXrWHGHYUDLQWHUURJHUFHQRXYHDXVHUYHXU PRGHLWpUDWLI

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(67) DNS : les serveurs de noms (5) ❍. 5HGRQGDQFHGHVVHUYHXUV ‡ 8QVHUYHXUDSSHOpSULPDLUH ² %DVHG LQIRUPDWLRQVG XQGRPDLQH ² &HWWHEDVHHVWPLVHjMRXUPDQXHOOHPHQW ² VHXOHDXWRULWpVXUOHVLQIRUPDWLRQVGXGRPDLQH ‡ 'HVVHUYHXUVVHFRQGDLUHV ² FRSLHDYHFPLVHjMRXUDXWRPDWLTXHGHODEDVH G LQIRUPDWLRQVGXVHUYHXUSULPDLUH ² VROOLFLWDWLRQjLQWHUYDOOHUpJXOLHUGXVHUYHXUSULPDLUH ² VWRFNHQWGDQVOHXUFDFKH. DNS : les serveurs de noms (6) ❍. 5HPDUTXHV ² ,OIDXWELHQFKRLVLUVRQVHUYHXUSULPDLUHHWVHVVHUYHXUV VHFRQGDLUHV ² 3HQVHUDXHQILQGHVQRPVTXLGpVLJQHQWXQGRPDLQH DEVROX ² $WWHQWLRQjPRGLILHUOHQXPpURGHYHUVLRQGDQVOHVWDEOHVj FKDTXHPLVHjMRXU. Page 18.

(68) Les Requêtes et les réponses (1) ❍. OHVIRUPDWVVRQWVWDQGDUGLVpV ‡ 8'3 3RUW

(69) ‡ RFWHWVPD[LPXP (17(7(. 6. 6. 6. 6. RFWHWV (QWrWH !2SFRGHW\SHGHUHTXrWH 64QDPH4W\SH4FODVV 655VUpSRQGDQWjODUHTXrWHUHoXH 655VSRLQWDQWYHUVG DXWUHV16 655VHQSULPH. DNS : Les Requêtes (2) ([HPSOH 5HTXrWH ,%3)50;" ❍. 6 ‡ 4QDPH ,%3)5 ‡ 4W\SH 0; ‡ 4FODVV ,1. ❍. 66HW6 YLGHV. Page 19. 4QDPH 1RPFDQRQLTXH 4W\SH $3750;62$ 4FODVV ,1&+.

(70) DNS : Les Requêtes (3) 5pSRQVH ❍ 6 GƒUHTXrWH ❍. 6 ‡ ,%3)5. 0;. ❍. 6 YLGH. ❍. 6 ‡ 3DVFDOLESIU. . 3DVFDOLESIU. $. . DNS : Les Requêtes (4) 5HPDUTXH ‡ 3RXUODUpVROXWLRQ#,3!1RPGH0DFKLQHRQQ XWLOLVHSDVXQ IRUPDWGHUHTXrWHLQYHUVH ‡ PDLVOHSVHXGRGRPDLQH,1$''5$53$ 5)&

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(72) DNS : Les "Resolvers" (1) ❍. ❍. )RQFWLRQV ‡ &RUUHVSRQGDQFH1RP!#,3  !55VGHW\SH$ ‡ &RUUHVSRQGDQFH#,3!1RP  !55VGHW\SH375 #,3 [\]W  !UHTXrWHW]\[,1$''5$53$ ‡ 5HFKHUFKHGHWRXWHLQIRUPDWLRQGDQVODEDVHGHGRQQpHV GHO HVSDFHGHV1RPV ² XWLOLVDWLRQGXFDFKH 2EMHFWLIV UpGXLUHOHVGpODLVHWODFKDUJHGXUpVHDX UpGXLUHOHWUDYDLOGHV16. DNS : Les "Resolvers" (2) ❍. /H5HVROYHUHVWXQHLQWHUIDFH. 16. $SSOLFDWLRQV. 5(62/9(5. 3DUWLH/2&$/(. 16 3DUWLH',67$17(. Page 21.

(73) DNS : Mise en Oeuvre (1) /HVW\SHVGH6HUYHXUVGH1RPV ❍. ❍. ❍. ❍. ❍. 3DVGHVHUYHXUGXWRXWPDLVXQ5HVROYHU ‡ SDVGHUpVROXWLRQGHVQRPVGHVUHVVRXUFHVORFDOHV ‡ UpVROXWLRQGHVQRPVGHVUHVVRXUFHVGLVWDQWHV 6HUYHXUVHFRQGDLUH ‡ O DGPLQLVWUDWLRQGHVUHVVRXUFHVORFDOHVHVWDVVXUpHSDUXQWLHUV 6HUYHXUSULPDLUH ‡ DGPLQLVWUDWLRQGHVUHVVRXUFHVORFDOHV ‡ DXWRULWpVXUFHVLQIRUPDWLRQV 6HUYHXUFDFKH ‡ PpPRULVHOHVUHTXrWHVSUpFpGHQWHV ‡ DXFXQHWDEOHORFDOH 6HUYHXUIRUZDUGLQJ ‡ HQULFKLOHFDFKHG XQ RXSOXVLHXUV

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(75) 16. DNS : Mise en Oeuvre (2) /HV)LFKLHUVjFRQILJXUHU. ❍. HWFQDPHGERRW YHUVLRQELQG 

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(78) DNS : Mise en Oeuvre (3) 3RXUWHVWHUXQ16 ‡ QVORRNXS ² QVORRNXSUHVVRXUFH ² QVORRNXS !" ² QVORRNXSW\SH P[UHVVRXUFH ‡ KRVWV. Page 23.

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