Installation manual

Glossary-1
SIGNAMAX LLC • www.signamax.eu
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 Service (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.
DHCP Snooping
A technique used to enhance network security by snooping on DHCP server messages to
track the physical location of hosts, ensure that hosts only use the IP addresses assigned
to them, and ensure that only authorized DHCP servers are accessible.
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.