Appendix A: Glossary
Access Control List (ACL)
ACLs can limit network traffic and restrict access to certain users or devices by checking each
packet for certain IP or MAC (i.e., Layer 2) information.
Boot Protocol (BOOTP)
BOOTP is used to provide bootup information for network devices, including IP address
information, the address of the TFTP server that contains the devices system files, and the
name of the boot file.
Class of Service (CoS)
CoS is supported by prioritizing packets based on the required level of service, and then
placing them in the appropriate output queue. Data is transmitted from the queues using
weighted round-robin service to enforce priority service and prevent blockage of lower-level
queues. Priority may be set according to the port default, the packet’s priority bit (in the VLAN
tag), TCP/UDP port number, or DSCP priority bit.
Differentiated Services Code Point (DSCP)
DSCP uses a six-bit tag to provide for up to 64 different forwarding behaviors. Based on
network policies, different kinds of traffic can be marked for different kinds of forwarding. The
DSCP bits are mapped to the Class of Service categories, and then into the output queues.
Domain Name Service (DNS)
A system used for translating host names for network nodes into IP addresses.
Dynamic Host Control Protocol (DHCP)
Provides a framework for passing configuration information to hosts on a TCP/IP network.
DHCP is based on the Bootstrap Protocol (BOOTP), adding the capability of automatic
allocation of reusable network addresses and additional configuration options.
Extensible Authentication Protocol over LAN (EAPOL)
EAPOL is a client authentication protocol used by this switch to verify the network access
rights for any device that is plugged into the switch. A user name and password is requested by
the switch, and then passed to an authentication server (e.g., RADIUS) for verification. EAPOL is
implemented as part of the IEEE 802.1X Port Authentication standard.
GARP VLAN Registration Protocol (GVRP)
Defines a way for switches to exchange VLAN information in order to register necessary VLAN
members on ports along the Spanning Tree so that VLANs defined in each switch can work
automatically over a Spanning Tree network.
Generic Attribute Registration Protocol (GARP)
The GARP provides a generic attribute dissemination capability that is used by participants in
GARP Applications (GARP Participants) to register and de-register attribute values with other
GARP Participants within a Bridged LAN. The definition of the attribute types, the values that
they can carry, and the semantics that are associated with those values when registered, are
specific to the operation of the GARP Application concerned.
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