G
LOSSARY
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NTP Network Time Protocol provides the mechanisms to synchronize time
across the network. The time servers operate in a hierarchical-master-
slave configuration in order to synchronize local clocks within the subnet
and to national time standards via wire or radio.
OUT-OF-BAND
MANAGEMENT
Management of the network from a station not attached to the network.
PORT AUTHENTICATION See IEEE 802.1X.
PORT MIRRORING A method whereby data on a target port is mirrored to a monitor port for
troubleshooting with a logic analyzer or RMON probe. This allows data on
the target port to be studied unobstructively.
PORT TRUNK Defines a network link aggregation and trunking method which specifies
how to create a single high-speed logical link that combines several lower-
speed physical links.
PRIVATE VLANS Private VLANs provide port-based security and isolation between ports
within the assigned VLAN. Data traffic on downlink ports can only be
forwarded to, and from, uplink ports.
QOS Quality of Service. QoS refers to the capability of a network to provide
better service to selected traffic flows using features such as data
prioritization, queuing, congestion avoidance and traffic shaping. These
features effectively provide preferential treatment to specific flows either
by raising the priority of one flow or limiting the priority of another flow.
RADIUS Remote Authentication Dial-in User Service. RADIUS is a logon
authentication protocol that uses software running on a central server to
control access to RADIUS-compliant devices on the network.
RMON Remote Monitoring. RMON provides comprehensive network monitoring
capabilities. It eliminates the polling required in standard SNMP, and can
set alarms on a variety of traffic conditions, including specific error types.
RSTP Rapid Spanning Tree Protocol. RSTP reduces the convergence time for
network topology changes to about 10% of that required by the older IEEE
802.1D STP standard.
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