Finally, on top of all the other layers sits an application. Consider the case of a book seller with an on-line catalog (see Table 2.1). The application is a book catalog; encryption is used to protect a customer's credit card number; the application is written in HTML; HTTP is the messaging protocol; and the Internet physically transports messages between the book seller and customer.
|
Electronic commerce applications |
Book catalog |
|
Business services infrastructure |
Encryption |
|
Electronic publishing infrastructure |
HTML |
|
Message distribution infrastructure |
HTTP |
|
National information infrastructure |
Internet |
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