MNC 2/6

HTTP & SMTP

PULL (HOST INIT TCP )

PUSH(SENDER SERVER PUSH INFO TO RECEIVER SERVER, RECEIVER SERVER INIT TCP)

ASC2 for SMTP, PERSISTENT

HTTP: OBJECT, EACH OBJ IN ITS OWN RESPONSE MSG

SMTP: EMAIL MESSAGE , MULTIPLE OBJ SENT IN MULTIPART MSG

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WEB BASED EMAIL

POP3 IMAP
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LOCAL DNS SERVER

13 ROOT SERVER

TLD DNS SERVER

AUTHORITATIVE DNS SERVER

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www.google.com
google.com
just different alias which is mapped to the same IP