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forwards them to all ports contained within the designated multicast
VLAN group.
MVR Multicast VLAN Registration is a method of using a single network-
wide multicast VLAN to transmit common services, such as such as
television channels or video-on-demand, across a service-provider’s
network. MVR simplifies the configuration of multicast services by
using a common VLAN for distribution, while still preserving security
and data isolation for subscribers residing in both the MVR VLAN and
other standard or private VLAN groups.
NTP Network Time Protocol provides the mechanisms to synchronize time
across the network. The time servers operate in a hierarchical-
asterslave 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.
QINQ QinQ tunneling is designed for service providers carrying traffic for
multiple customers across their networks. It is used to maintain
customer-specific VLAN and Layer 2 protocol configurations even
when different customers use the same internal VLAN IDs.
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
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