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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.
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.
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.
SNMP Simple Network Management Protocol. The application protocol in the
Internet suite of protocols which offers network management services.
SNTP Simple Network Time Protocol allows a device to set its internal clock based on
periodic updates from a Network Time Protocol (NTP) server. Updates can
be requested from a specific NTP server, or can be received via broadcasts
sent by NTP servers.
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