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Authentication, Authorization, and Accounting (AAA):
A term for a framework for intelligently controlling access to computer resources, enforcing policies, auditing usage, and providing the information necessary to bill for services. These combined processes are considered important for effective network management and security.

Coarse wavelength division multiplexing (CWDM):
A relatively low-cost WDM technology that uses wide spacing (about 10 nm) between wavelengths and uncooled optics.

Dense wave division multiplexing (DWDM):
Wave division multiplexing (WDM) refers to an optical transmission technique where multiple optical signals are transmitted on a single optical fiber using different wavelengths. The term dense wave division multiplexing (DWDM) is often used to describe systems supporting a large number of channels, with “large?not clearly defined, but ranging from upwards of 16.

DMZ:
In computer networks, a DMZ (demilitarized zone) is a computer host or small network inserted as a “neutral zone?between a company's private network and the outside public network. It prevents outside users from getting direct access to a server that has company data.

Dynamic Host Configuration Protocol (DHCP):
A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network. Using the Internet Protocol, each machine that can connect to the Internet needs a unique IP address.

Dynamic Naming Server (DNS):
The way that Internet domain names are located and translated into Internet Protocol addresses. A domain name is a meaningful and easy-to-remember “handle?for an Internet address.

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