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Glossary 179
O
OID
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.
Port Speed
Indicates port speed of the port. Port speeds
include:
• Ethernet 10 Mbps
• Fast Ethernet 100Mbps
• Gigabit Ethernet 1000 Mbps
Protocol
A set of rules that governs how devices exchange
information across networks.
Q
QoS
Quality of Service.
QoS allows network managers to
decide how and what network traffic is forwarded
according to priorities, application types, and source
and destination addresses.
Query
Extracts information from a database and presents
the information for use.
R
RADIUS
Remote Authentication Dial-In User Service
. A
method for authenticating system users, and
tracking connection time.
RMON
Remote Monitoring
. Provides network information
to be collected from a single workstation.
Router
A device that connects to separate networks.
Routers forward packets between two or more
networks. Routers operate at a Layer 3 level.