Appendix B: Glossary
DNS - Domain Name System (DNS). The distributed name/address mechanism used in the Internet.
DOCSIS - Known as CableLabs Certified Cable Modems, DOCSIS (Data Over Cable Service Interface Specifications) is a standard interface for cable modems, the devices that handle incoming and outgoing data signals between a cable TV operator and a personal or business computer or television set.
Domain - A subnetwork comprised of a group of clients and servers under the control of one security database. Dividing LANs into domains improves performance and security.
Download - To receive a file transmitted over a network. In a communications session, download means receive, and upload means transmit.
DSSS
the original data can be recovered. Even if one or more bits in the chip 90 are damaged during transmission, statistical techniques embedded in the radio can recover the original data without the need for retransmission. To
an unintended receiver, DSSS appears as low power wideband noise and is rejected (ignored) by most narrowband receivers.
Dynamic IP Address - An IP address that is automatically assigned to a client station in a TCP/IP network, typically by a DHCP server. Network devices that serve multiple users, such as servers and printers, are usually assigned static IP addresses.
Dynamic Routing - The ability for a Router to forward data via a different route based on the current conditions of the communications circuits. For example, it can adjust for overloaded traffic or failing lines and is much more flexible than static routing, which uses a fixed forwarding path.
Encapsulation - The wrapping of data in a particular protocol header. For example, Ethernet data is wrapped in a specific Ethernet header before network transit.
Encryption - Applying a specific algorithm to data in order to alter the data’s appearance and prevent other devices from reading information.