the web and e-mail chapter 7. 7 chapter 7: the web and e-mail2 chapter contents section a: web...
TRANSCRIPT
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The Web and E-mailThe Web and E-mail
Chapter 7Chapter 7
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Chapter 7: The Web and E-mail 2
7 Chapter Contents
Section A: Web Technology Section B: Search Engines Section C: E-commerce Section D: E-mail Section E: Web and E-mail Security
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Chapter 7: The Web and E-mail 3
7SECTION A
Web TechnologyWeb Technology Web Basics HTML HTTP Web Browsers Cookies Web Page Authoring HTML Scripts
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Chapter 7: The Web and E-mail 4
7 Web Basics
The Web is an interlinked collection of document, image, video, and sound files
A Web site contains a collection of related information
Podcasts RSS vs. Atom Videocasting
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Chapter 7: The Web and E-mail 5
7 Web Basics A Web page is the product or output of one or more
Web-based files displayed in a format similar to a page in a book
A Web browser is client software that displays Web page elements and handles links between pages
Every Web page has a unique address called a URL
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Chapter 7: The Web and E-mail 6
7 HTML
Set of specifications for creating documents that a browser can display as a Web page
Markup language HTML tags XHTML DHTML Ajax
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Chapter 7: The Web and E-mail 7
7 HTML
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Chapter 7: The Web and E-mail 8
7 HTTP
HTTP messages flow
between a browser and a Web server.
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Chapter 7: The Web and E-mail 9
7 Web Browsers Help you access Web pages Upgrade to new browser
versions as they become available
Popular browsers:– Internet Explorer– Mozilla Firefox– Apple Safari– Netscape Navigator– Opera
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Chapter 7: The Web and E-mail 10
7 Web Browsers
Helper applications extend browser’s ability to work with file formats– A plug-in is a type of helper application– A player is any helper
application or plug-in that helps a browser display a particular file format
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Chapter 7: The Web and E-mail 11
7 Cookies
Small chunk of data generated by a Web server and stored on computer’s hard disk– Fix problems caused by HTTP’s stateless
protocol– Relatively safe
Your computer does not have to accept cookies
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Chapter 7: The Web and E-mail 12
7 Web Page Authoring Text editor HTML conversion tool Online Web authoring
tools Web authoring software
– Microsoft FrontPage– Adobe Dreamweaver
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Chapter 7: The Web and E-mail 13
7 HTML Scripts
HTML scripts can perform complicated tasks and respond to user actions– HTML forms– Server-side script– Client-side script– Java applet– ActiveX control
Digital Certificate
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Chapter 7: The Web and E-mail 14
7SECTION B
Search EnginesSearch Engines Search Engine Basics Formulating Searches Citing Web-based Source Material
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Chapter 7: The Web and E-mail 15
7 Search Engine Basics
A Web search engine is a program designed to help people locate information on the Web by formulating simple keyword queries
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Chapter 7: The Web and E-mail 16
7 Search Engine Basics A Web crawler is a computer program that is automated to
methodically visit Web sites A search engine indexer is software that culls keywords from
a Web page and stores them in a database A search engine’s query processor looks for your search
terms in search engine’s indexed database and returns list of relevant Web sites
Link popularity is measured by quantity and quality of links from one Web page to others
A meta keyword is entered into a header section of a Web page when it is created and is supposed to describe the page contents– Keyword stuffing
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Chapter 7: The Web and E-mail 17
7 Formulating Searches Most search engines
work with keyword queries in which you enter one or more words, called search terms
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Chapter 7: The Web and E-mail 18
7 Formulating Searches
A Boolean operator is a word or symbol that describes a relationship between keywords, helping you create a more focused query
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Chapter 7: The Web and E-mail 19
7 Citing Web-Based Source
To copy a passage of textfrom a Web page, highlightthe text, click the Editmenu, then select Copy.Next, switch to your owndocument and use thePaste option.
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Chapter 7: The Web and E-mail 20
7 Citing Web-Based Source
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Chapter 7: The Web and E-mail 21
7SECTION C
E-commerceE-commerce E-commerce Basics Online Shopping Online Auctions Online Payment
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Chapter 7: The Web and E-mail 22
7 E-commerce Basics
Business transactions conducted electronically over a computer network– B2C (business-to-consumer)– C2C (consumer-to-consumer)– B2B (business-to-business)– B2G (business-to-government)
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Chapter 7: The Web and E-mail 23
7 E-commerce Basics Enhances traditional business models Styles of online advertisements
– Banner ad– Hover ad– Pop-up ad
• Click-through rate
Ad-blocking software prevents ads from appearing on screens
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Chapter 7: The Web and E-mail 24
7 Online Shopping
In a typical shoppingsession, you connect toan online storefront anduse navigation controlsto browse through themerchant’s catalog. Asyou browse, you candrop items into yourelectronic shopping cart.At the checkout counter,you enter the informationnecessary to pay for theitems you selected.
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Chapter 7: The Web and E-mail 25
7 Online Shopping
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Chapter 7: The Web and E-mail 26
7 Shopping Carts
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Chapter 7: The Web and E-mail 27
7 Online Auctions An online auction is the
electronic equivalent to good old-fashioned yard sales, rummage sales, and auctions
You can expect to bid on new, used, closeout, overstock, or refurbished items at an online auction
Computer software takes the place of an auctioneer
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Chapter 7: The Web and E-mail 28
7 Online Payment
The most popular ways to make online payments include submitting your credit card number directly to a merchant and using a third-party payment service such as PayPal
Online shoppers are justifiably worried that personal information and credit card numbers supplied in the course of an e-commerce transaction might be hijacked and used inappropriately
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Chapter 7: The Web and E-mail 29
7 Online Payment
A secure connection encrypts the data transmitted between your computer and a Web site
• SSL (Secure Sockets Layer)• S-HTTP (secure HTTP)
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Chapter 7: The Web and E-mail 30
7 Online Payment Person-to-person payments
are an alternative to credit cards– The payment service is the
only entity that sees your credit card number
– Service is in its infancy An electronic wallet is
software that stores billing and shipping information
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Chapter 7: The Web and E-mail 31
7 Online Payment
An electronic wallet can transfer your billing and shipping information to aparticipating site’se-commerce Web server when you check out.
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Chapter 7: The Web and E-mail 32
7SECTION D
E-mailE-mail E-mail Overview Netiquette E-mail Technology
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Chapter 7: The Web and E-mail 33
7 E-Mail Overview
Any person with an e-mail account can send and receive e-mail messages
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Chapter 7: The Web and E-mail 34
7 E-Mail Overview
Basic e-mail activities– Writing– Reading– Replying– Forwarding
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Chapter 7: The Web and E-mail 35
7 E-Mail Overview
E-mail attachments are files that travel with an e-mail message– E-mail software converts e-mail attachments to
MIME
HTML-compliant e-mail software Additional e-mail features
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Chapter 7: The Web and E-mail 36
7 E-Mail Overview
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Chapter 7: The Web and E-mail 37
7 Netiquette
Internet etiquette– Meaningful subject– Use uppercase and lowercase letters– Check spelling– Be careful what you send– Be polite– Be cautious with sarcasm and humor
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Chapter 7: The Web and E-mail 38
7 Netiquette– Use smileys and text
messaging shorthand cautiously
– Use the Bcc function for group mailings
– Don’t send replies to all recipients
– Don’t send huge attachments– Explain attachments– Stay alert for viruses– Notify recipients of viruses
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Chapter 7: The Web and E-mail 39
7 E-mail Technology E-mail systems carry and manipulate e-mail
messages– E-mail servers– Based on store-and-forward technology
Three types of e-mail systems widely used today:– POP– IMAP– Web-based e-mail
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Chapter 7: The Web and E-mail 40
7 E-mail Technology
Web-based e-mail accounts allow you to use a browser to access your e-mail messages
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Chapter 7: The Web and E-mail 41
7 E-mail Technology A POP server is a
computer that stores your incoming messages until they can be transferred to your hard disk– E-mail client software– SMTP server
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Chapter 7: The Web and E-mail 42
7SECTION E
Web and E-mail SecurityWeb and E-mail Security
Cookie Exploits Fake Sites Spam Phishing
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Chapter 7: The Web and E-mail 43
7 Cookie Exploits
An ad-serving cookie can track your activities at any site containing banner ads from a third party
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Chapter 7: The Web and E-mail 44
7 Cookie Exploits A Flash cookie, also called a local shared object, is
the Flash equivalent of a conventional Web cookie A Web bug or clear GIF is typically a 1x1 pixel
graphic embedded in a Web page or e-mail message. It is almost invisible due to its size, and is designed to track who’s reading the Web page or e-mail message
Antispyware is a type of security software designed to identify and neutralize Web bugs, ad-serving cookies, and other spyware
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Chapter 7: The Web and E-mail 45
7 Cookie Exploits Individuals who prefer
not to leave a trail of their Internet activities surf through an anonymous proxy service, which uses an intermediary, or proxy, server to relay Web page requests after masking the originating IP address
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Chapter 7: The Web and E-mail 46
7 Fake Sites A fake Web site
looks legitimate, but has been created by a third party to be a very clever replica of a legitimate Web site
Pharming is an exploit that redirects users to fake sites by “poisoning” a domain name server with a false IP address
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Chapter 7: The Web and E-mail 47
7 Spam Spam is unwanted electronic junk mail about
medical products, low-cost loans, and fake software upgrades that arrives in your online mailbox
A spam filter is a type of utility software that captures unsolicited e-mail messages before they reach your inbox
To combat spam sent by hijacked botnet computers, e-mail authentication techniques, such as Sender ID and DomainKeys, verify that e-mail messages originate from the Internet domain from which they claim to have been sent
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Chapter 7: The Web and E-mail 48
7 Spam
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Chapter 7: The Web and E-mail 49
7 Phishing
Phishing is an e-mail based scam designed to persuade you to reveal confidential information, such as your bank account number or Social Security number
If you don’t want to become a phishing victim, be suspicious of e-mail messages that supposedly come from banks, ISPs, online payment services, operating system publishers, and online merchants
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Chapter 7: The Web and E-mail 50
7 Phishing
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Chapter 7 CompleteChapter 7 Complete
The Web and E-mailThe Web and E-mail