COMPUTER BASICS METC 106

The Internet Global group of interconnected networks Originated in 1969 – Department of Defense ARPANet Only text, no graphics until 1989 – World Wide Web - WWW 2009 Pearson Prentice Hall. All right reserved. 2

The WWW World Wide Web Subset of the Internet that displays graphics Hyperlinks (links) – Connections to other Web pages Viewed with graphical browser No commercial interest in the Internet until the advent of the WWW 2009 Pearson Prentice Hall. All right reserved. 3

Web Addresses Anyone can have a Web page – Web authoring tool (software) HTML, JavaScript, or Java – Internet server Physically hosts the Web page Every Web page has a unique Uniform Resource Locator (URL) 2009 Pearson Prentice Hall. All right reserved. 4

URL Uniform Resource Locator – String of unique characters 2009 Pearson Prentice Hall. All right reserved. 5 Hypertext Transfer Protocol - Internet communication protocol Domain name - address of the Internet server where the Web page resides Type of organization Folder name Filename with extension

Downloading or Uploading Downloading – Process of obtaining a file from another computer – Receive a copy of the file – Success depends on Having enough disk space on your computer File must be available for unrestricted copying Uploading – Process of placing a file onto another computer – Give a copy of the file 2009 Pearson Prentice Hall. All right reserved. 6

What is ? A typed message Sent to several people at the same time Forwarded to one or more people Delivered immediately – Recipients can respond immediately Style is short and informal and is easy to create Add files as attachments 2009 Pearson Prentice Hall. All rights reserved. 7

Servers Computers dedicated to managing Must have an account Mail arrives at a destination mail server – Held in an electronic mailbox until you retrieve it Sent goes to a mail server that forwards it to the destination 2009 Pearson Prentice Hall. All rights reserved. 8

Windows Mail and Outlook Express client software Outlook – Windows XP Windows Mail – Vista – Instant searches – Spam filters – Phishing filters 2009 Pearson Prentice Hall. All rights reserved. 9

Risks has security and privacy risks Computer viruses can be sent via – Can damage or annoy computer users Phishing tricks you into giving out personal data Spam is unsolicited or junk mail 2009 Pearson Prentice Hall. All rights reserved. 10

Spam junk mail – unsolicited and unwanted Set filters in the client to delete it Do not respond or reply – Confirms the address is valid and used Delete it ISP may filter out spam 2009 Pearson Prentice Hall. All rights reserved. 11

Viruses Spread via attachments – Sent along with the – asks you to open attachment - Don’t – Only open attachments from a trusted source Antivirus software helps prevent viruses 2009 Pearson Prentice Hall. All rights reserved. 12

Phishing appears to be from legitimate entity – IRS – Bank – Police Asks user to either – Visit a web site or – Send personal information Web site can download virus Leads to Identity theft 2009 Pearson Prentice Hall. All rights reserved. 13

Sending All has two parts – The header Name and address of the recipient Wrong address causes a bounce – Returned – The body Message content 2009 Pearson Prentice Hall. All rights reserved. 14

Sending (continued) To: – Can send to more than one recipient Use comma or semicolon between names CC: – Carbon copy (without carbon paper) BCC: – Blind carbon copy – Primary recipient can’t see addresses in BCC: 2009 Pearson Prentice Hall. All rights reserved. 15

Netiquette Some basic rules of Internet politeness – l l – Spell correctly – Avoid all capital letters (shouting) – Keep short and to the point – Never put confidential information in – Be clear in the Subject line 2009 Pearson Prentice Hall. All rights reserved. 16

Netiquette (continued) – Keep addresses confidential – Avoid flaming, excessive humor, and sarcasm – Avoid chain letters – Always include your name and address in message – Don’t use emoticons for formal messages 2009 Pearson Prentice Hall. All rights reserved. 17

Attachments A file attached to a message Adding an attachment to share – Photographs – Documents – Songs View with caution – Due to virus possibilities – Scan prior to viewing – Be wary of unsolicited s with attachments 2009 Pearson Prentice Hall. All rights reserved. 18

Microsoft Windows Update Windows is the most common OS – Does not mean error free or secure Microsoft provides patches or updates monthly – Critical updates fix serious security threats Service Pack – A large group of patches – Fixes large scale problems Both Service Pack and Patches are free Updates can be automatically loaded and installed on computer from the Internet 2009 Pearson Prentice Hall. All rights reserved. 19

Risks: Viruses Program written to either annoy or destroy data – Maliciously written software – Travels from computer to computer – Infects via attachments or program downloads Antivirus software – Detects viruses – Quarantines viruses – Updated automatically Can wipe out entire hard disk and/or make data unreadable 2009 Pearson Prentice Hall. All rights reserved. 20