Wheel Seminar

WEB & E-MAIL

SPARCS 11Sun-

guard

WEB ?Basic Concept of “WEB”

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“(Web == Service) = True”

WEB ?Basic Concept of “WEB”

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‘ABC, 가나다’( 문

자 )

( 영상 )

( 음성 )

MultimediaInformation

MultimediaInformation

WEB ?Basic Concept of “WEB”

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World WideWeb

WEB ?Basic Concept of “WEB”

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 WEB = the Mesh

+ Mine of Information

WEB ?Brief History of “WEB” – Who & Why

Who Created ‘WEB’ ?

- Tim Berners Lee- Robert Cailliau

CERN laboratory in SwitzerlandCERN = European Council for Nuclear Research

Why made ‘WEB’ ?

To make Information Interchange easily and effectively

WEB ?Brief History of “WEB” – Tim Berners Lee

Who is ‘Tim Berners Lee’ ?

- The Father of ‘World Wide Web’- Developed ‘Enquire’ ‘WWW’- Designed >> ‘HTTP(HyperText Transfer Protocol)’

‘HTML(HyperText Markup Language)’‘URL(Uniform Resource Locator)’

- Developed ‘Web Browser, Mosaic’- Established ‘W3C(World Wide Web Consortium)’

WOW

WEB ?Brief History of “WEB” – Enquire & Mosaic

Enquire!?

- This concept is that… “Wherever computer is exists, if we can read data of it, that will be able to compose the huge information space.”

Mosaic!?

- The first Web Browser!!- The first Multimedia GUI program!!- It had been developed since 1987, but in 1997(January 7th), it stopped.

(After story…Mark Andreesen & James Clark Mosaic Communications Corp. Spyglass Mosaic Internet Explorer(Licensed by Microsoft.)

http://en.wikipedia.org/wiki/Mosaic_(web_browser)

WEB ?Introduction of Web Browser

What kinds of…?

- Internet Explorer, Mozilla Firefox, Opera, Safari, Google Chrome, Navigator, Avant, Flock, Kmelon, MineField, SeaMonkey, Shiretoko, WebMaster, JW Browser, Road Browser, The World, etc.

WEB ?Introduction of Web Browser

Web Browser Web Server

HTTP

suppose Web Stan-dards!!

What is that?

http://en.wikipedia.org/wiki/Web_standards

HTML, XML, XHTML, Graphic File Format,

CSS, JAVAscript(DHTML), etc.

http://en.wikipedia.org/wiki/Web_Browser

And… TRANSLATE them!!

But, Now… Something is different

WEB ?Brief Introduction for Web Server

as Software…

- Client/Server Model & Request/Response- Kinds of PROGRAM- Port Number : 80- Examples : APACHE, IIS, LOTUS DOMINO SERVER, etc.

http://en.wikipedia.org/wiki/Web_server

WEB ?Brief Introduction for HTTP

HTTP(Hyper Text Transfer Protocol)

- This is PROTOCOL!- Between Client & Server, this is the “Request/Response Protocol”

Client ServerRequest

Response

HTML, CSS, JavaScript, etc. + Error Code

http://ko.wikipedia.org/wiki/HTTP#.EC.98.A4.EB.A5.98_.EC.BD.94.EB.93.9C

WEB ?Brief Introduction for URL

URL(Uniform Resource Locator)

- Form! & Protocol!- We can manage and describe the addresses of accessible resources easily with URL

Form of URL

URL = Protocol + Domain Name(or IP address) + Di-rectory

Telnet, FTP, HTTP

- Telnet is the method that makes clients who have the authority to use the host computer be able to access to other’s host computer remotely.- This is also protocol which is based on TCP/IP- Difference with ‘FTP, HTTP’ is that client can “Log on”

http://terms.co.kr/Telnet.htm

WEB ?Brief Introduction for URL

URL(Uniform Resource Locator)

- Form! & Protocol!- We can manage and describe the addresses of accessible resources easily with URL

Form of URL

URL = Protocol + Domain Name(or IP address) + Di-rectory

Telnet, FTP, HTTP

- File Transfer Protocol- To transfer files between computer and computer.- Based on TCP/IP- Security Issue : Password is not encrypted.

SFTP(through SSH), SCP(Secure CoPy)

http://terms.co.kr/FTP.htm

WEB ?Brief Introduction for URL

URL(Uniform Resource Locator)

- Form! & Protocol!- We can manage and describe the addresses of accessible resources easily with URL

Form of URL

URL = Protocol + Domain Name(or IP address) + Di-rectory

Telnet, FTP, HTTP

- Explained before… So! SKIP

WEB ?Brief Introduction for URL

URL(Uniform Resource Locator)

- Form! & Protocol!- We can manage and describe the addresses of accessible resources easily with URL

Form of URL

URL = Protocol + Domain Name(or IP address) + Di-rectory

Server Name + Group(Apparatus) Name + Characteristic Code

http://terms.co.kr/DNS.htm

WEB ?Brief Introduction for URL

URL(Uniform Resource Locator)

- Form! & Protocol!- We can manage and describe the addresses of accessible resources easily with URL

Form of URL

URL = Protocol + Domain Name(or IP address) + Di-rectory

WEB ?Brief Introduction for HTML

HTML(Hyper Text Markup Language)

- Markup Language!!(with CSS, Script): Describe how to show Texts or Images on Web Browser

- Be formed with Tag attributes

What kinds of…?(Doctypes)

Strict, Transitional, Frameset

http://www.w3schools.com/

“Details about HTML”

E-Mail ?What is E-Mail ?

@Electronic

Mail BBUE-ING!BBUE-ING!

E-Mail(Electronic Mail)

- A method of exchanging digital messages from an author to one or more recipients

- E-mail Address : User_ID@Mail_Server_Name

슬라이드 쇼가 끝났습니다 . 끝내려면 마우스를 클릭하십시오 .

E-Mail ?Brief Introduction for Principle of E-Mail

Send & Receive E-mail

E-Mail ?Brief Introduction for Principle of E-Mail

Send & Receive E-mail

MDAhttp://wlan.egloos.com/10222487

E-Mail ?Sending & Receiving E-mail

Mail Server

MUA(Mail User Agent)

Write & Send E-mail

MDA(Mail Delivery Agent)

MTA(Mail Transfer Agent)

Mail Server

MUA(Mail User Agent)

Receive & Read E-mail

MDA(Mail Delivery Agent)

http://cusee.net/102

E-Mail ?E-Mail Protocols – Basic Concept

What kinds of…

- IMAP(Internet Message Access Protocol)

- POP3(Post Office Protocol 3)

- SMTP(Simple Mail Transfer Protocol)

- HTTP(HyperText Transfer Protocol)

E-Mail ?E-Mail Protocols

Mail Server

MUA(Mail User Agent)

Write & Send E-mail

MDA(Mail Delivery Agent)

MTA(Mail Transfer Agent)

Mail Server

MUA(Mail User Agent)

Receive & Read E-mail

MDA(Mail Delivery Agent)

http://www.emailaddressmanager.com/tips/mail-servers.html

POP3IMAPHTTP

SMTP

POP3IMAPHTTP

E-Mail ?E-Mail Protocol - SMTP

SMTP(Simple Mail Transfer Protocol)

- Based on TCP/IP

- Used by the Mail Transfer Agent(MTA)> To deliver your E-mail to the recipient's mail server

- Can only be used to send emails, not to receive them

- Depending on your network / ISP settings, you may only be able to use the SMTP protocol under certain conditions

- Port 25- Secure SMTP(SSMTP) : port 465

http://www.ietf.org/rfc/rfc0821.txt

E-Mail ?E-Mail Protocol – POP3

POP3(Post Office Protocol 3)

- Provides a simple, standardized way for users> To access mailboxes> To download messages to their computers

(Mail Server user’s Local computer)

- Users can choose to leave copies of their E-mails on the server

- The advantage :: Once messages are downloaded on users’ local computer, users can read their E-mails when they are on off-line.

- But… users might read all messages which include Spam-mails, and so on when they are using this protocol to down-load messages to local computer.

- Port 110- Secure POP3(SSH-POP) : port 995

http://www.faqs.org/rfcs/rfc1939.html

E-Mail ?E-Mail Protocol - IMAP

IMAP(Internet Message Access Protocol)

- A standard protocol for accessing e-mail from a user’s local server

- A client/server protocol in which e-mail is received

- As this requires only a small data transfer, this works well even over a slow connection such as a modem

- Port 143- Secure IMAP(IMAP4-SSL) : port 585- IMAP4 over SSL : port 993

http://www.imap.org/

E-Mail ?POP3 and IMAP

DIFFERENCE BETWEEN POP AND IMAP

E-Mail ?E-Mail – Header & Body

E-mail; Header

- This header keeps important resources- Users can’t see this

- Server Name, Message ID, Send Date/Time, Send Route, Encoding setting

Language Information, etc.

http://cusee.net/102

E-mail; Body

- Contents and Messages in e-mail- Attachments in e-mail

E-Mail !E-Mail !!

E-MAIL

Mailing List ?What is Mailing List ?

Mailing List is…

JUST MAILING LIST!

Mailing List ?How does it work ?

wheel-seminar@sparcs.org

Mail Server(sparc-s.org)

OH? Mailing List…?!

/etc/aliases

/home/sparcs/mail/aliases.d/wheel-seminar

bbashong, rodumani, sunguard, boolgom, over-mania, podo, alphamin, leeopop, gangok, cling, grandmarnier, etc. + @sparcs.org

http://www.niso.org/khelp/kmlm/user_help/html/intro_lists_aliases.html

ReferenceWhere you can get more information

http://zenome.com.ne.kr/devzone/server_side/mailserver/princi.htmlhttp://python.kr/viewtopic.php?p=35286&sid=90ba518f728aa9be294ce4edcf7c43a5http://cusee.net/102http://wlan.egloos.com/10222487http://en.wikipedia.org/wiki/Mosaic_(web_browser)http://en.wikipedia.org/wiki/Web_Browserhttp://en.wikipedia.org/wiki/Web_standardshttp://en.wikipedia.org/wiki/Web_serverhttp://ko.wikipedia.org/wiki/HTTP#.EC.98.A4.EB.A5.98_.EC.BD.94.EB.93.9Chttp://terms.co.kr/Telnet.htmhttp://terms.co.kr/FTP.htmhttp://www.w3schools.com/http://www.emailaddressmanager.com/tips/mail-servers.htmlhttp://www.ietf.org/rfc/rfc0821.txthttp://www.faqs.org/rfcs/rfc1939.htmlhttp://www.imap.org/http://www.niso.org/khelp/kmlm/user_help/html/intro_lists_aliases.html

ENDThank you for listening!

SunGuard