1. Delving into the Internet and Networks

2. In the beginning  ARPANET – set up for the military to have another network of communication  Pre-cursor to the internet

3. HTML  Hyper Text Markup Language  Displayed through a web browser  Is being replaced by XHTML

4. XHTML  Extensive Hyper Text Markup Language  More specific than HTML  Used to allow for XML  XML is used to create your own tags

5. Doctype  Strict  Transitional  Frameset

6. CSS  Cascading Style Sheet  Internal or linked  Control the appearance of elements in your web page.  Why cascading?

7. JavaScript  Must activate in Internet Explorer  Used with forms for processing information  Used with CSS to animate elements

8. Cookies  Text file  Saved on YOUR computer  Used to help keep setting at a website  Expiration Date

9. DOM  Document Object Model

10. Flash  Good for animations  Creates a.swf file  Can have anchors/links  Embedded into an HTML file Embedded  Text in Flash movies not searchable

11. File Types  Files made up of a filename and a file extension separated by a period myreport.doc index.html banner.jpg file namefile extension

12. Webpage files  use the following extensions .html .htm .php .asp .jsp

13. Graphic Files Use the following extensions File attributes .jpg .gif .png .tiff .bmp  Compressed, basic graphics  Compressed, support transparency and animation  Compressed, more colors, alpha channel  Not compressed, must have application to view it  Not compressed, basic image, MS Paint’s default

15. Other files .exe – executable files .pdf – acrobat reader .doc – word document .css – cascading style sheet .js – javascript file

16. Multimedia Files  MPEG – Graphics and Sound .avi – video .mov – quicktime movie .swf - flash movie

17. Compression Files  Some graphic files are compressed: jpg, gif, png  Other compressions zip (archive)

18. Protocols  What is a protocol? Just a standard way to do something Ex: US mail address follows a protocol ○ Persons Name ○ Street Address ○ City, State, and Zip Code  The internet uses certain protocols for transferring electronic data

19. HTTP  Hyper Text Transfer Protocol  Transfer text, anchors, graphics and sound  Uses port 80

20. TCP/IP  Used for sending and receiving packets via the internet  Each computer must have a separate and unique IP address  TCP is what the router uses to attach the IP address to packets being sent

21. IP addresses  Uses Four 3 digit numbers separated by a period  can use the numbers 0 – 255  ex: 172.0.0.1 205.52.45.31

22. DNS Server  resolves domain names to IP addresses  This is why you can type in google.com in the URL and find the site for Google’s search engine  What’s Google’s IP address?

23. DHCP Server  This server will hand out an IP address to a network computer when it is booted up.  The IP can be changed with RELEASE or RENEW  Set up by your network administrator

24. IPCONFIG  Let’s you see your computer’s IP settings  Let’s try it

25. IP Classes  Class A Used with large businesses and small countries Subnet mask : 255.0.0.0  Class B Used with large businesses Subnet mask: 255.255.0.0  Class C Used for small businesses and personal use Subnet mask: 255.255.255.0

26. FTP  File Transfer Protocol  Uses Port 21

27. Email Protocols  SMTP – for out going mail  POP3 – for in coming mail Formats include MIME and Bin Hex and UUEncode

28. Access  Having rights to connect to a server or folders to FTP

29. Anchor  Used for Hyper links  tags  Can include images, text, and image maps

30. Tables vs. CSS  Layout of a Web page  Tables were the old way Static, didn’t display as well from one browser to another  CSS was developed to include positioning elements as well as changing the look and feel of text, graphics, etc. Uses the tags for DIViding up the page into divisions.

31. Domains  Common names of websites Google.com Yahoo.com espn.com murrayschools.org

32. ISP  Internet Service Providers Qwest DSL (Direct Sub Link) – Uses Ethernet Comcast Cable – Uses Coaxial cable

33. VPN  Virtual Private Network a tunnel into an network from home

34. Searches  Search engines Google Yahoo MSN  use quotations to search for specific phases

35. Email encoding  Uuencoding  Bin Hex  MIME

36. Bandwidth  The amount of data that can be sent through a connection

37. Safety - Firewall  Firewall set up to block programs from the internet from running on your computer

38. Virus  – sent in email attachments. Propagates itself when opened.

39. Worm  – does not have to be run or opened to propagate itself on a network

40. Trojan  Trojan – You think your running one program, but it’s doing something behind the scenes

41. Certificate Server  Sends an electronic “certificate” to a computer from the network to tell the computer it is a legitimate program to run

42. SSL  Secure Sockets Layer  HTTPS  Encodes the information  Used with most online orders