Protecting Against Failure
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![Page 1: Protecting Against Failure](https://reader036.fdocuments.in/reader036/viewer/2022082818/56812d0d550346895d91e381/html5/thumbnails/1.jpg)
Protecting Against Failure
• Backups – multiple generations
• Surge Protector – power surges
• UPS – uninterrupted power supply
• Mirroring data / RAID
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People are Risky
• don’t see themselves as a risk.
• work around security.
![Page 3: Protecting Against Failure](https://reader036.fdocuments.in/reader036/viewer/2022082818/56812d0d550346895d91e381/html5/thumbnails/3.jpg)
Reliability
• when we rely on computers, and something goes wrong, the impact can be significant :
• Therac 25 • Y2K – $100 billion
• cannot find all of the bugs• they harder bugs are to find, the worse
they are may be.• increased complexity compounds the
problem.
![Page 4: Protecting Against Failure](https://reader036.fdocuments.in/reader036/viewer/2022082818/56812d0d550346895d91e381/html5/thumbnails/4.jpg)
Security vs. Privacy
• balancing.
• examples :– e-mail at work– cell phone with GPS – active badge
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Internet & Web
• the World Wide Web and the Internet are not the same thing.
• WWW – an application of the Internet.
• Popularity :– easy to use.– easy to add– easy to search.
![Page 6: Protecting Against Failure](https://reader036.fdocuments.in/reader036/viewer/2022082818/56812d0d550346895d91e381/html5/thumbnails/6.jpg)
Internet Applications
• email & mailing lists
• FTP & file sharing
• Usenet & boards & forums
• World Wide Web
• Instant Messaging & Chat
• Remote Login & Telnet
• VOIP
![Page 7: Protecting Against Failure](https://reader036.fdocuments.in/reader036/viewer/2022082818/56812d0d550346895d91e381/html5/thumbnails/7.jpg)
Web
• distributed information system.
• hypertext & hypermedia.
• browser : software for accessing www.
• Plug-in : extend the capabilities of your web browser.
![Page 8: Protecting Against Failure](https://reader036.fdocuments.in/reader036/viewer/2022082818/56812d0d550346895d91e381/html5/thumbnails/8.jpg)
• documents linked in non-linear ways• web is only one example (help
files, DVDs, multimedia applications)
Hypertext & Hypermedia
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• may not have the links you want• dead links – maintenance• not like hardcopy – notes and
highlighting• hard to read long passages of text on
the computer screen• disorienting
Hypertext & Hypermedia
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Web
• url : uniform resource locator
• http : hypertext transfer protocol
• html : hypertext markup language
• web authoring tools
• Domain name registry
![Page 11: Protecting Against Failure](https://reader036.fdocuments.in/reader036/viewer/2022082818/56812d0d550346895d91e381/html5/thumbnails/11.jpg)
<html>
<head>
<title>Web Example</title>
</head>
<body>
<h1>CSCI 1200</h1>
<p>
CSCI 1200 is a computer science
class offered for non-majors.
</p>
</body>
</html>
![Page 12: Protecting Against Failure](https://reader036.fdocuments.in/reader036/viewer/2022082818/56812d0d550346895d91e381/html5/thumbnails/12.jpg)
Tags
• anchor tag
<a href="url">Text to be displayed</a>
• image tag <img src = “happy.gif“>