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Glossary 461
NMS
Network Management System. An interface that provides a method of managing a system.
Node
A network connection endpoint or a common junction for multiple network lines. Nodes include:
• Processors
• Controllers
• Workstations
O
OID
Organizationally Unique Identifiers. Identifiers associated with a Voice VLAN.
OUI
Object Identifier. Used by SNMP to identify managed objects. In the SNMP Manager/ Agent network
management paradigm, each managed object must have an OID to identify it.
P
Packets
Blocks of information for transmission in packet switched systems.
PDU
Protocol Data Unit. A data unit specified in a layer protocol consisting of protocol control information
and layer user data.
PING
Packet Internet Groper. Verifies if a specific IP address is available. A packet is sent to another IP address
and waits for a reply.
Port
Physical ports provide connecting components that allow microprocessors to communicate with
peripheral equipment.
Port Mirroring
Monitors and mirrors network traffic by forwarding copies of incoming and outgoing packets from one
port to a monitoring port.
For more information on port mirroring, see Defining Port Mirroring Sessions.