The Internet Unit Information Systems, Higher. The Internet HTML Two sets of notes.

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Presentation transcript:

The Internet Unit Information Systems, Higher

The Internet HTML Two sets of notes

Notes on the Internet Internet services Communications hardware URL DNS Protocol TCP/IP, TCP/IP address, classes, sub netting Packet switching Internet security Internet regulatory boards/organisations Security and privacy RSA/PGP Internet use and the law Web resource information

Internet services List of Internet services World Wide Web (WWW) Conferencing and newsgroups File transfer and file updating Chat/instant message

Communications hardware Server side hardware consists of Computers Disk drives Communication links Multiplexor Hubs Switches Routers Gateways Bridges

URL URL structure Protocol Domain name Path File identifier Port number (optional)

TCP/IP Transmission protocol TCP IP 1:5www.yahoo.comwww.you.com 2:5www.yahoo.comwww.you.com 3:5www.yahoo.comwww.you.com 4:5www.yahoo.comwww.you.com 5:5www.yahoo.comwww.you.com

Packet switching Why packet switching? Need for IP Packet 2 Packet 3 Packet 4 Packet 1:5 Packet 5

TCP/IP classification 32-bit IP address Network ID Host ID 32 BITs Network IDHost ID

Internet security Viruses Un-authorised access (hacking) Denial of service attacks Information theft

Internet regulatory boards IETF IANA W3C NOMINET

Security and privacy Packet filtering Firewall Proxy server Packet filter router Or Firewall Or Proxy server Internet Host ID

Security Encryption Key distribution problem RSA PGP Browser encryption Secure sockets

Law Data Protection Act 1984, 1989, 2000, 2004 Copyright, Design & Patents Act 1988 Computer Misuse Act 1990

Policing the Internet Need for international agreement Problems reaching international agreements

HTML Client side Server side Client side Server side

HTML structure Start of document marker /End of document marker Heading /End of Heading Body /End of body This area is not displayed The content, which is displayed in the browser

HTML tags definitions Browser recognises and interprets HTML script instructions Ignore text

What is sent on WWW HTML script My Home Page

Enter HTML script

HTML transmission <html xmlns:o="urn:schemas-microsoft- com:office:office" xmlns:w="urn:schemas-microsoft- com:office:word" xmlns=" html40"> MY HOME PAGE My Home Page

Create website

WWW colors RGB colour system Hexadecimal Text color Bg color Anchor colours

HTML tables Similarity with spreadsheet Set up table Menu table Cellspacing Cellpadding

Uploading website Ftp software Publishing Index.html

Client side scripting JavaScript VBScript Compare JavaScript and VBScript Need for client side scripting Document.Write command Document.Cookie command

Submission form

Form validation Need for validation Simple VBS validation script Mailto: Problems with Mailto: CGI_bin Alert messages

PHP Future development Web server processing of hyper text MySQL Cookies and databases

Cascade style sheets Need for style sheets Writing CSS Three methods of including CSS

Outcome 2 Budget Airways Home Page.html Glasgow Departures.html Edinburgh Departures.html Dublin Departures.html Booking Form.html

Outcome 2 Create website Use tables Create submission form Form validation Hyper linking