CSCE101 Ch 2

1
CSCE101 Ch 23

• September 12, 2006

2
Announcements

• Test 1 will be on Tuesday September 26 and will
  cover Chapters 1,2,3.
• 1.1,1.2,1.3 grades will be posted by noon
  tomorrow (September 13). Check the dropbox for
  your grades.
• First HW will be given and returned before
  September 26

3
Email Services

• Email program vs. web-based email
• (Gmail, Hotmail, Yahoo!mail, Softhome, Lycos)
• Email addressing
• Joe_Black_at_earthlink.net.us

4
How email works
5
Netiquette

• Avoid flaming
• Dont SHOUT or overuse emoticons
• Be careful with humor
• Please dont feed the trolls

6
Email problems

• Spam
• Spoofing
• Phishing
• A special form of virus email worm
• - with or without a payload

7
Email problems (continued)

• Email privacy
• Generally not encrypted
• Go through many intermediate computers
• ISPs retain backups
• Cryptography applications can be used to protect
  messages in transit
• Even deleted email can be read file shredders

8
Other Services

• Broadcasting Services
• Instant Messaging
• Newsgroups
• Listservs
• Real-time chat
• Webcasting, podcasting, RSS
• Blogging and the Blogosphere (escribitionists,
  webcam)

9
Other Services (continued)

• E-commerce
• B2B
• B2C
• C2C
• Internet, private internets, Internet2, National
  LambdaRail, HOPI (Hybrid Optical and Packet
  Structure), NSF (Global Environment for
  Networking Investigations)

10
Everything in your Web browser

• Plug-in can be a player or viewer. Browser is
  the sandbox
• Privacy plug-ins (PGP)
• Video plug-ins RealPlayer
• Audio plug-ins
• Applets are written in Java or Visual Studio.net.
  Can add applets to web pages for animation, etc.

11
Web problems

• Pharming
• Cookies
• Adware or pop-up generators
• Browser Hijackers Search Hijackers

12
Chapter 3

• Computer Software System Software Application
  Software
• System Software Operating System Device
  Drivers Utility Programs
• Operating System Interface

13
Functions of OS

• Provides User Interface
• Controls Computer Startup
• (Booting)
• Manages Files
• Manages flow of instructions and data

14
Boot Process

• When you turn your computer on
• the processor automatically begins
• executing the part of the operating systems
  startup system (BIOS) located in ROM.
• These instructions help load the operating system
  from the hard disk into RAM (main memory), and
• then they pass control to the OS.