something called an IP address
http://en.wikipedia.org/wiki/IP_address
a 32-bit number
that means that there are 4 bytes in an IP address

hard to remember IP addresses
DNS - domain name server
will give you IP addresses in return for domain names

hosts file in a specific folder on your computer

can use it to block web sites
scammers can use it, so nowadays, only edit as admin

Domain:
everything from the :// until the first / after that


http://www.scamsite.ru/login/www.chase.com/

http://23.123.6.5/www.chase.com/login

http://0x62.0x1F.0x11.0x44/www.chase.com/login

TLDs - top level domain
TLAs = three letter acronym

.com
.org
.net
.gov
.edu
.xxx

whitehouse.gov


countries have their own top level domain
.uk
ac.uk
co.uk

google.co.uk
google.com

subdomain
www.google.com

www is a subdomain within google.com
google.com is the "real" domain

Dr. Svitak's website
http://eniac.cs.qc.edu/~svitak/cs12/

eniac.cs is the subdomain

http://www.chase.com.gimmeyourinfo.ru/login
This is NOT really chase.com
It is a Phishing scheme

Let us pretend that my name is Joshua Waxman and my CunyFirst ID is 12345678

hostname of OUR webserver is:
cs12.cs.qc.cuny.edu
login: first two letters of YOUR last name +
first two letters of YOUR first name +
last 4 digits of your CunyFirst ID
my login: wajo5678
my password: 12345678

#1: lowercase
#2: maybe the first and lastnames are reversed
#3: it is YOUR information, not mine
#4: if it still doesn't work, see Xiuyi

HW: Go home and install WinSCP on your computer
(or Fugu / TextWrangler if you have a Mac)

Usually, web pages are stored on web server
Your web browser is called the client

When you load up a webpage by typing in a URL

you are sending an "HTTP request"
http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol

You type in: http://en.wikipedia.org/wiki/Main_Page

something like: GET /wiki/Main_Page http/1.1
to host: en.wikipedia.org

The webserver responds with an Http response
HTTP/1.0 200 OK
followed by the contents of the requested html page

web client receives it, and renders it

other responses:
404 Page not found
403 Forbidden

The Web is NOT the Internet
it is one of the services available on the internet




there is software called WinSCP
is windows software for editing files remotely, and file transfer

if you have a Mac, you will need Fugu instead
follow this link
http://cs12.cs.qc.cuny.edu/~xiuyi/fugu.html

If you a PC (most of you do):
http://winscp.net/eng/download.php

Make sure you don't download the Beta version

What is Beta?
What is Alpha?
make sure to get the stable version