Glossary

Appendix B

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 (DiffServ 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..

Flow Control - Enables lower speed devices to communicate with higher speed devices.. This is implemented by the higher speed device refraining from sending packets..

FTP (File Transfer Protocol) - A protocol used to transfer files over a TCP/IP network..

Full Duplex - The ability of a networking device to receive and transmit data simultaneously..

GARP (General Attributes Registration Protocol) - Registers client stations into a multicast domain..

Gateway - A device that interconnects networks with different, incompatible communications protocols..

GBIC (GigaBit Interface Converter) - A hardware module used to attach network devices to fiber-based transmission systems.. GBIC converts the serial electrical signals to serial optical signals and vice versa..

GVRP (GARP VLAN Registration Protocol) - Registers client stations into a VLANs..

Half Duplex - Data transmission that can occur in two directions over a single line, but only one direction at a time..

HTTP (HyperText Transport Protocol) - The communications protocol used to connect to servers on the World Wide Web..

HTTPS (HyperText Transport Protocol Secure) - An extension to the standard HTTP protocol that provides confidentiality by encrypting the traffic from the website.. By default this protocol uses TCP port 443..

ICMP (Internet Control Message Protocol) - Allows the gateway or destination host to communicate with the source host.. For example, to report a processing error..

IGMP (Internet Group Management Protocol) - Allows hosts to notify their local switch or router that they want to receive transmissions assigned to a specific multicast group..

IP (Internet Protocol) - A protocol used to send data over a network..

IP Address - The address used to identify a computer or device on a network..

IPCONFIG - A Windows 2000 and XP utility that displays the IP address for a particular networking device..

IPSec (Internet Protocol Security) - A VPN protocol used to implement secure exchange of packets at the IP layer..

ISP (Internet Service Provider) - A company that provides access to the Internet..

Jumbo Frames - Enable transporting identical data in fewer frames.. Jumbo Frames reduce overhead, lower processing time, and ensure fewer interrupts..

LAG (Link Aggregated Group) - Aggregates ports or VLANs into a single virtual port or VLAN..

LAN - The computers and networking products that make up your local network..

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