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tema 3
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3. PROTOCOLS DE LA CAPA D’APLICACIÓ1. Domain Name System (DNS)
Serveix per fer servir noms en comptes d’adreçes IP
-Usa UDP o TCP->port 53.
-Els noms estan estructurats jeràrquicament per dominis (.cat és un domini) noms independents
de les adreçes
-Base de dades distribuïda i jeràrquica que emmagatzema informació associada a noms de domini
en xarxes com internet.
-Cada domini gesNona els seus noms
-Capaç d’associar diferents Npus d’informació a cada nom
-Usos més comuns:
·Assignació de noms de domini a adreces IP
·Localització dels servidors de correu electrònic de cada domini
2. Simple Mail Transfer Protocol
Tramesa de correu electrònic
-Protocol TCP, que funciona al port 25
-No podem assumit que l’usuari el rebi, però si que arribi a l’ordinador de desNnació.
-Protocol molt simple, basat en text, per enviar Missatges de correu electrònic a un altre disposiNu
-Format: definit en un document RFC 2821
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