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

Services program vs. web-based (Gmail, Hotmail, Yahoo!mail, Softhome, Lycos) addressing:

How works

Netiquette Avoid flaming Don’t SHOUT or overuse emoticons Be careful with humor Please don’t feed the trolls

problems Spam Spoofing Phishing A special form of virus – worm - with or without a “payload”

problems (continued) privacy –Generally not encrypted –Go through many intermediate computers –ISPs retain backups Cryptography applications can be used to protect messages in transit Even deleted 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.