Dell PowerConnect 55xx Systems User Guide 709FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Maintenance Projects\DellContax\sources\CxUGGlossary.fmD E L L C O N F I D E N T I A L – P R E L I M I N A R Y 1 0 / 3 0 / 1 3 - F O R P R O O F O N LYClass of ServiceClass of Service (CoS). Class of Service is the 802.1p priority scheme. CoSprovides a method for tagging packets with priority information. A CoS valuebetween 0-7 is added to the Layer II header of packets, where zero is thelowest priority and seven is the highest.A overlapping transmission of two or more packets that collide. The datatransmitted cannot be used, and the session is restarted.CLICommand Line Interface. A set of line commands used to configure thesystem. For more information on using the CLI, see Using the CLI.CommunitiesSpecifies a group of users which retains the same system access rights.CPUCentral Processing Unit. The part of a computer that processes information.CPUs are composed of a control unit and an ALU.DDHCP ClientA device using DHCP to obtain configuration parameters, such as a networkaddress.DHCP SnoopingDHCP Snooping expands network security by providing firewall securitybetween untrusted interfaces and DHCP servers.DSCPDiffServe Code Point (DSCP). DSCP provides a method of tagging IPpackets with QoS priority information.DomainA group of computers and devices on a network that are grouped withcommon rules and procedures.Duplex ModePermits simultaneous transmissions and reception of data. There are twodifferent types of duplex mode:
