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GLOSSARY
ACL Access Control List. 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.
BOOTP Boot Protocol. 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.
COS Class of Service 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, IP Precedence bit, or DSCP
priority bit.
DIFFSERV Differentiated Services provides quality of service on large networks by
employing a well-defined set of building blocks from which a variety of
aggregate forwarding behaviors may be built. Each packet carries
information (DS byte) used by each hop to give it a particular forwarding
treatment, or per-hop behavior, at each network node.
DiffServ allocates
different levels of service to users on the network with mechanisms such as
traffic meters, shapers/droppers, packet markers at the boundaries of the
network.
DHCP Dynamic Host Control Protocol. 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.
DHCP OPTION 82 A relay option for sending information about the requesting client (or an
intermediate relay agent) in the DHCP request packets forwarded by the
switch and in reply packets sent back from the DHCP server. This
information can be used by DHCP servers to assign fixed IP addresses, or
set other services or policies for clients.
DNS Domain Name Service. A system used for translating host names for
network nodes into IP addresses.
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