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Appendix D: Glossary
24-Port 10/100/1000 Gigabit Switch with Webview and PoE
Combo Ports - A single logical port with two physical connections, including an RJ-45 connection and a SFP
connection.
Communities - Specifies a group of users which retain the same system access rights.
CoS (Class of Service) - The 802.1p priority scheme. CoS provides a method for tagging packets with priority
information. A CoS value between 0-7 is added to the Layer II header of packets, where zero is the lowest priority
and seven is the highest.
DDNS (Dynamic Domain Name System) - Allows the hosting of a website, FTP server, or e-mail server with a
fixed domain name (e.g., www.xyz.com) and a dynamic IP address.
Default Gateway - A device that forwards Internet traffic from your local area network.
DHCP (Dynamic Host Configuration Protocol) - A networking protocol that allows administrators to assign
temporary IP addresses to network computers by “leasing” an IP address to a user for a limited amount of time,
instead of assigning permanent IP addresses.
DHCP Clients - An Internet host using DHCP to obtain configuration parameters, such as a network address.
DHCP Server - An Internet host that returns configuration parameters to DHCP clients.
DNS (Domain Name Server) - The IP address of your ISP's server, which translates the names of websites into IP
addresses.
Domain - A specific name for a network of computers.
Download - To receive a file transmitted over a network.
DSL (Digital Subscriber Line) - An always-on broadband connection over traditional phone lines.
DSCP (DiffServe Code Point) provides a method of tagging IP packets with QoS priority information.
Dynamic IP Address - A temporary IP address assigned by a DHCP server.
EIGRP (Enhanced Interior Gateway Routing Protocol) - Provides fast convergence, support for variable-length
subnet mask, and supports multiple network layer protocols.
Encryption - Encoding data transmitted in a network.
Ethernet - IEEE standard network protocol that specifies how data is placed on and retrieved from a common
transmission medium.
Firmware - The programming code that runs a networking device.
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