Dell PowerConnect 5548 User Guide - Page 698

Class of Service (CoS). Class of Service is 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. A overlapping transmission of two or more packets that collide. The data transmitted cannot be used, and the session is restarted. CLI Command Line Interface. A set of line commands used to configure the system. For more information on using the CLI, see Using the CLI. Communities Specifies a group of users which retains the same system access rights. CPU Central Processing Unit. The part of a computer that processes information. CPUs are composed of a control unit and an ALU. D DHCP Client A device using DHCP to obtain configuration parameters, such as a network address. DHCP Snooping DHCP Snooping expands network security by providing firewall security between untrusted interfaces and DHCP servers. DSCP DiffServe Code Point (DSCP). DSCP provides a method of tagging IP packets with QoS priority information. Domain A group of computers and devices on a network that are grouped with common rules and procedures. Duplex Mode Permits simultaneous transmissions and reception of data. There are two different types of duplex mode: 698 Dell PowerConnect 55xx Systems User Guide