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Published byShon Mathews Modified over 7 years ago
Delving into the Internet and Networks
In the beginning ARPANET – set up for the military to have another network of communication Pre-cursor to the internet
HTML Hyper Text Markup Language Displayed through a web browser Is being replaced by XHTML
XHTML Extensive Hyper Text Markup Language More specific than HTML Used to allow for XML XML is used to create your own tags
Doctype Strict Transitional Frameset
CSS Cascading Style Sheet Internal or linked Control the appearance of elements in your web page. Why cascading?
Cookies Text file Saved on YOUR computer Used to help keep setting at a website Expiration Date
DOM Document Object Model
Flash Good for animations Creates a.swf file Can have anchors/links Embedded into an HTML file Embedded Text in Flash movies not searchable
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
Webpage files use the following extensions .html .htm .php .asp .jsp
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
Multimedia Files MPEG – Graphics and Sound .avi – video .mov – quicktime movie .swf - flash movie
Compression Files Some graphic files are compressed: jpg, gif, png Other compressions zip (archive)
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
HTTP Hyper Text Transfer Protocol Transfer text, anchors, graphics and sound Uses port 80
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
IP addresses Uses Four 3 digit numbers separated by a period can use the numbers 0 – 255 ex: 220.127.116.11 18.104.22.168
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?
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
IPCONFIG Let’s you see your computer’s IP settings Let’s try it
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
FTP File Transfer Protocol Uses Port 21
Email Protocols SMTP – for out going mail POP3 – for in coming mail Formats include MIME and Bin Hex and UUEncode
Access Having rights to connect to a server or folders to FTP
Anchor Used for Hyper links tags Can include images, text, and image maps
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.
Domains Common names of websites Google.com Yahoo.com espn.com murrayschools.org
ISP Internet Service Providers Qwest DSL (Direct Sub Link) – Uses Ethernet Comcast Cable – Uses Coaxial cable
VPN Virtual Private Network a tunnel into an network from home
Searches Search engines Google Yahoo MSN use quotations to search for specific phases
Email encoding Uuencoding Bin Hex MIME
Bandwidth The amount of data that can be sent through a connection
Safety - Firewall Firewall set up to block programs from the internet from running on your computer
Virus – sent in email attachments. Propagates itself when opened.
Worm – does not have to be run or opened to propagate itself on a network
Trojan Trojan – You think your running one program, but it’s doing something behind the scenes
Certificate Server Sends an electronic “certificate” to a computer from the network to tell the computer it is a legitimate program to run
SSL Secure Sockets Layer HTTPS Encodes the information Used with most online orders
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