Internet routers dns and html
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128.230. Internet, Routers, DNS, and HTML. 10. 14. 11. Chicago. Boston. CNY. 13. Seattle. Yale. 15. NYC. 12. 9. DNS: cs.colgate.edu = 149.43.3.23 ………. 149.43.1.7 149.43.3.23 (cs.colgate.edu) 149.43.2 149.43.80.142 …………. ~chungli public_html/ index.html. Denver. 3. html.

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Internet, Routers, DNS, and HTML

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128.230

Internet, Routers, DNS, and HTML

10

14

11

Chicago

Boston

CNY

13

Seattle

Yale

15

NYC

12

9

DNS:

cs.colgate.edu = 149.43.3.23

………..

149.43.1.7

149.43.3.23 (cs.colgate.edu)

149.43.2

149.43.80.142

………….

~chungli

public_html/

index.html

Denver

3

html

SF

7

16

We need a DNS to translate this domain name so the router knows how to forward the message.

Suppose the IE is configured to use the DNS in SF

DNS:

cs.colgate.edu = 149.43.3.23

………..

8

17

2

LA

4

Houston

6

1

address: http://cs.colgate.edu/~chungli

5

UCLA

cs.ucla.edu/~aaahttp://cs.colgate.edu/~chungli

18

………….

131.179.128.25 (cs.ucla.edu)

………….

I.E.

131.179.128.25/~aaahttp://cs.colgate.edu/~chungli

131.179.128.25/~aaa149.43.3.23/~chungli

R

19


Cosmetics & HTML

Cosmetics :

Tools or material to make up faces

Face + (????)

HTML : HyperText Makeup Language

Tools or material to make up hypertext document

HTML Document = Hypertext + HTML Tags


HyperText & HTML

  • Text, tables, frames, pictures, images, links, scripts, etc.

  • Computer Language is the instruction to control the computer.

  • HTML is designed to make the above objects in a hypertext look nicer.

How: An html document is stored in plaintext format (why?) but uses tags to distinguish the text for the reader from the instructions to the computer.

An HTML document can:

Provide information to Search Engines, instruct web browsers (IE, Netscape, Hotjava..), send and collect information to and from web vierwers.


Text and HyperText

Mathematicians and Philosophers

by Chung-Chih Li

Rene Descartes:

"I am thinking, therefore I exist."

Descartes was the most important figure in modern mathematics and philosophy, and this probably is the most famous say of Descartes; but what does it really mean? The existence is established necessarily via mankind's awareness, which seemed self-evidence to Descartes, but some obvious objections followed immediately. You may want to see the excellent debate in Meditations on First Philosophy edited by John Cottingham --, which is a collection of Descartes' Meditations, their objections, and Descartes' replies.

"The brain is a machine."

<h1> Mathematicians and Philosophers </h1>

<div class="author">by Chung-Chih Li </div>

<h3> Rene Descartes: </h3>

<h4> "I am thinking, therefore I exist.“

</h4>

Descartes was the most important figure in modern mathematics and philosophy, and this probably is the most famous say of Descartes; but what does it really mean? The existence is established necessarily via mankind's awareness, which seemed self-evidence to Descartes, but some obvious objections followed immediately. You may want to see the excellent debate in <em class="s"> Meditations on First Philosophy </em> edited by <strong> John Cottingham </strong> --, which is a collection of Descartes' Meditations, their objections, and Descartes' replies.

<h4> "The brain is a machine. " </h4>

Text: Every letter in a text document is for its reader to read.

HTML Document: Some letters or words are not for its reader to read but for computer to control the appearance of the text or perform some tasks; text, tables, frames, pictures, images, links, scripts, etc.

makeup


How to create HTML documents?

  • Using tools, HTML editor, Web editor: Netscape Composer, MS Frontpage

  • Learn HTML tags and using a plaintext editor to create HTML documents.

PlainText editor : Only the letters seen on the editor screen will be stored (in ASCII), e.g, notepad, vi, emacs, winedt..


Tags

In general, a tag is an instruction to instruct the web browser how to present the objects ;

<h1>This is H1</H1>

start tag

end tag

End tag closes the effect

of start tag.

Some tags do not have end tags, e.g.

<br> : line breaking


Structure of an HTML document

<html>

<head>

  • In this head section, the web author can provide information about the page to the web browsers or search engines.

</head>

<body>

  • This is section where the web author puts the material for his/her readers to see.

</body>

</html>


Attributes of a Tag

Some tags use attributes to specify how to perform their functions.

<font color=“green”> Turn me into green </font>

Attribute name

Attribute value

We can specify more than one attribute in a tag. E.g.

<font color=“green” size=+2> Turn me bigger and green

</font>


<HR> tag

Some tags generate objects for the web browser.

<hr size=10 color=“green" align="left" width=20%>

<hr size=10 color=“red" align=“center" width=50%>


<head> Tag

<title> Basic HTML </title>

<meta http-equiv="Content-Type" content="text/html; charset=big5">

<meta name="Author" content="Chung-Chih Li (Dennis)">

<meta name="GENERATOR" content="Microsoft FrontPage 3.0">

</head>


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