Andrea Zito Riccardo Conti Classe 5SA · TCP/IP Network Model Encapsulation Application Transport...

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Andrea Zito Riccardo Conti Classe 5SA

Transcript of Andrea Zito Riccardo Conti Classe 5SA · TCP/IP Network Model Encapsulation Application Transport...

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AndreaZitoRiccardoConti

Classe5SA

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Alcunicennistorici� Neiprimianni‘70DARPAdefinisceilmodellosucuipoisibaseràlosviluppodellareteInternet

� ConARPAnetnel1974siparlaperlaprimavoltadiInternet

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Archite.uradisistema

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LivelloApplicazione� Comprendeiprotocollidilivellopiùaltoegestiscel’interfacciaconl’utente

�  FTP� DNS� NFS�  SMTP

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LivelloTrasporto� Èlaconnessionetrasorgenteedestinazione�  Scomponeleinformazioniinsegmenti�  Lavoraconduetipidiservizi:servizidi“stream”eservizi“datagram”

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LivelloInternet�  Selezionaimigliorpercorsoperrecapitareilmessaggio

�  InviapacchettidiinformazionimedianteilprotocolloIP

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Livellodirete�  Ilprotocolloutilizzatovariadaretearete�  IncludetecnologiecomeLANeWLAN

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Stru.uraLivelli

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Incapsulamento� Ognilivelloinspedizioneaggiungedaticaratteristicidellivelloeli“passa”allivellosottostante

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Intestazione�  L’intestazioneIPècostituitadaalcunigruppidi4byte

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Stru.uradegliindirizziIP� Compostoda32bit(4byte)esuddivisoin“indirizzodirete”e“indirizzodell’host”

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ClassidiindirizziIP

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Re=IPprivate� EsistonotreblocchidiindirizziaretiprivatenonconnesseaInternet:

1.  10.0.0.0rappresentaun’interaclasseA2.  172.16.0.016retidiclasseB3.  192.168.0.0255retidiclasseC