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Glossary-1
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.
Address Resolution Protocol (ARP)
ARP converts between IP addresses and MAC (i.e., hardware) addresses. ARP is
used to locate the MAC address corresponding to a given IP address. This allows
the switch to use IP addresses for routing decisions and the corresponding MAC
addresses to forward packets from one hop to the next.
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, IP Precedence bit, 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.
Distance Vector Multicast Routing Protocol (DVMRP)
A distance-vector-style routing protocol used for routing multicast datagrams
through the Internet. DVMRP combines many of the features of RIP with Reverse
Path Forwarding (RPF).
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