Glossary of Internet Terms

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Cookies
Provide a simple way to identify session among a group of HTTP/HTML requests. The cookie value is often an index into a table stored in the memory of a Web server that points to an inmemory object holding the user's records. This has many potential problems: If the user's request is routed to a different server in a subwequent request, the session information is unknown to the server. If the user is rounted to a different server and the server is part of an application cluster, then all the servers that could receive the user's request must have a way to synchronize the session data. Storing cookies and synchronizing sessions among clusters of server usually requires configuration, storage space, and memory.

Data Encryption Key (DEK)
Used for encryption and decryption of message text.

Data Encryption Standard (DES)
Standardized encryption method used most on the Internet.

Datagram
A block of data that can travel from one Internet site to another without relying on an earlier exchange between the source and destination computers.

DSL (Digital subscriber line)
The DSL offers high-band width connections to small businesses and homes via regular telephone lines

DDN (Defense Data Network)
The United States Department of Defense global communications network.

DECnet
A proprietary network protocol designed by Digital Equipment Corporation.

Dedicated line
A communications line used solely for computer connections, such as T1 and T3 lines. An additional phone line solely for your modem is a dedicated line as well.

Defense Data Network (DDN)
The United States Department of Defense global communications network.

DNS (Domain Name Service)
A name service used with TCP/IP hosts. A DNS exists on numerous servers over the Internet. It is a database for finding host names and IP addresses on the Internet and trying to figure them out.

E-mail
E-mail stands for electronic mail. Most networks support some form of email. The most popular, of course, is Internet email. E-mail allows you to send text (such as a letter) to another person on another computer. In order to send an email, you have to know the email address of the recipient. Internet email addresses always start with the user's account name, then the at sign (@), then the name of the computer where the user gets his or her email. You can never have spaces in email or Web addresses. For example, my email address is: w@wdell.com

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