CSCE101 – Ch 2&3

September 12, 2006

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

Email Services

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

• Email addressing:Joe_Black@earthlink.net.us

How email works

Netiquette

• Avoid flaming

• Don’t SHOUT or overuse emoticons

• Be careful with humor

• Please don’t feed the trolls

Email problems

• Spam

• Spoofing

• Phishing

• A special form of virus – email worm- with or without a “payload”

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

Other Services

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

webcam)

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)

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.

Web problems

• Pharming

• Cookies

• Adware or pop-up generators

• Browser Hijackers & Search Hijackers

Chapter 3

• Computer Software = System Software + Application Software

• System Software = Operating System + Device Drivers + Utility Programs

• Operating System Interface:

Functions of OS

• Provides User Interface

• Controls Computer Startup

(Booting)

• Manages Files

• Manages flow of instructions and data

Boot Process

• When you turn your computer on…• …the processor automatically begins…• …executing the part of the operating

system’s 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.