Protocols DNS TELNET e-Mail FTP WWW NNTP SNMP

Protocols: DNS, TELNET, e-Mail, FTP, WWW, NNTP, SNMP, NTP etc.

Application layer

DNS - The purpose

DNS - Historical remarks

DNS design goals

DNS design goals (contd. )

yahoo ucla physics acad amigo val www mary joe kevin mail see-grid test book sigma

Top Level Domains

Resource Records

DNS server

Source: http: //k. root-servers. org

DNS servers (contd. )

DNS servers (contd. )

Reverse DNS query

TELNET protocol

TELNET protocol (2)

Electronic mail

Paper mail e-mail

Reading E-mail An example of mailbox

Message Formats – RFC 822

MIME – Multipurpose Internet Mail Extensions The original e-mail was designed to transfer 7 -bit text (ASCII) characters only, so. . .

Final e-mail delivery

Post Office Protocol (POP 3)

FTP – an example session

FTP pros and cons

The Client Side

The Server Side

The Server Side (2)

The Server Side (3)

The World Wide Web - HTTP

HTTP - Some Message Headers

HTTP - Caching

Statelessness and Cookies

(a) The HTML for a sample page. (b) The formatted page.

HTML (3)

HTML Tables

HTML Forms

HTML Forms (2)

A simple Web page in XML.

Dynamic Web Documents

Dynamic Web Documents (2)

“Web Services”

NNTP (2)

SNMP – some history

SNMP Technology

SNMP Operations

SNMP v 1 Packet Format

SNMP v 2 Packet Format

The new SNMP v 3

SNMP Conclusion

NTP - Introduction

Needs for precision time

NTP summary

NTP architecture overview

NTP subnet configurations

NTP - Goals and non-goals

NTP Version 4

Squeezing the nanoseconds

NTP resources

Miscellaneous Application Protocols (2)