1. The Internet: What is it? How does it work?
There are supposedly at least 14 billion pages on the internet and, as per Smithsonian, “from every single one of these pages you can navigate to any other in 19 clicks or less.”

2. A History of Internet Connectivity: 1970s
December 1969
June 1970
December 1970
August 1972
June 1974
July 1976
July 1977
Source:

3. A History of Internet Connectivity: TODAY!

4. How many Internet Users are there?
1993!!!

5. So what is this thing we call….the Internet

6. Internet Service Providers
You first connect to an ISP and then to the Internet!!
The ISP then connects you to the Internet
Remember the YouTube example about crazy Aunt Ruth
BIG Cable
Step 1
Step 2

7. What do these Big Cables look like?
Interactive Cable Map!!!:
Video: Here's what it takes to lay Google's 9,000km undersea cable

8. Anatomy of a URL
URL: uniform resource locator. Identifies resources on the internet along with the application protocol needed to retrieve it
Protocol: set of rules for communication—sort of like grammar and vocabulary in a language like English
Other Protocols:
SMTP, FTP, IMAP

9. Host Names, Domain Names, Domain
hostname: the place/computer you are looking for on a network
domain name and domain: name of a network associated with an organization, and the type of network
In the USA, we use: org-name.org-type
Example:
http = Hypertext Transfer Protocol
mis320 = hostname
weebly = domain name
.com = Commercial organization

10. Path and File Names Path: a folder location
File: the file within the folder
files are usually written in the hypertext markup language (HTML), which is basically the language of the web
Example:
tech/index.html
Tech = technology folder
index.html = name of file

11. IP Addresses
IP Address: where you live on the Internet; Unique series of numbers that identify computers on the Internet
you get an IP address from the organization you are connected to the internet through
At home, your ISP assigns you an IP address
At WWU, Western’s ISP assigns you one
No two computers have the same IP address
IPv4 Examples: (composed of 4 segments) WE ARE RUNNING OUT!!! = = =
IPv6 Examples: (composed of 8 segments)
3ffe:1900:4545:3:200:f8ff:fe21:67cf
21DA:D3:0:2F3B:2AA:FF:FE28:9C5A

12. The Domain Name Service
People don’t remember IP Addresses do they use words (google.com, wwu.edu, etc.)
Domain Name Service: a distributed database that looks up the host and domain names that you enter and returns the actual IP address for the computer that you want to communicate with

13. Watch it all come together

14. What do we know so far….
how to read a Web address
every device connected to the Net needs an IP address
the DNS can look at a Web address and find the IP address of the machine that you want to communicate with
But..
How does a Web page, an , or an iTunes download actually get from a remote computer to your desktop????

15. TCP/IP Webpages, videos, pictures, are TOO BIG!!!!
TCP: works its magic at the start and endpoint of the trip—on both your computer and on the destination computer you’re communicating with
TCP slices up the web page into small chunks of data called packets
Packets: smaller pieces of information containing part of an entire transmission
IP: route the packets to their final destination

16. A Packet’s Tale

17. HOA#7: Internet Security