2nd quiz will be up to last lecture
meaning, sept 20 and 22nd
Lecture book: ch 1

Anatomy of a URL
url: website address

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

scheme://domain:port/path?query_string#fragment_id

scheme://domain/

scheme, or protocol
http://
https://
ftp://
telnet://
gopher://

http = hypertext transfer protocol

http://en.wikipedia.org/wiki/Uniform_Resource_Locator
what is the scheme?
http

what is the domain?
en.wikipedia.org

what is the path?
(C:\josh\subfolder\hello.txt)
/wiki/Uniform_Resource_Locator

#fragment_id
some bookmark within the html page

Analyzing domains

http://mypage.net/5/6/www.chase.com/login
Phishing
embedding name not in the domain portion
misspellings

TLD - top level domain
example of a TLA (three letter acronym)
.com
.net
.gov
.org
.edu

www.chase.net

countries
.uk
.ru

.ac.uk
.co.uk

Domain:
www.google.com
what I will define as 'domain' is JUST the google.com

the www is what we call a subdomain

http://eniac.cs.qc.edu/~svitak/cs12/


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

look at the very last two things before the first slash
THAT is the domain

IP address
Really, there are four numbers that are used to identify any location on the Internet
http://en.wikipedia.org/wiki/IP_Address
Internet Protocol


IP addresses are hard to memorize
http://www.whois.net/
you type in a domain, they will tell you the IP


The Internet is NOT the same as the Web
The web is a bunch of connected documents
the internet is a bunch of connected computers (networks)

The "World Wide Web" is one service available on the Internet.

DNS - domain name service
automatic address book, mapping names to IP addresses
when i type google.com