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Virtual LANs ( VLANs )
A VLAN is a group of switch ports designated by the switch as
belonging to the same broadcast domain.
This feature allows workgroups to be defined on the basis of their
logical function instead of their physical location, and does not
require recabling. It also enables you to configure port-based VLANs
to help isolate broad- cast traffic and increase security, so as to
increase bandwidth to each station.
VLAN also helps you create limited broadcast domains, to prevent
traffic from being forwarded to stations where it is not needed.
Port Trunking
Port Trunking allows you to build higher bandwidth connections by
aggregate several ports into one single group.
Additionally, it may be more cost-effective to trunk multiple lower
speed links than to underutilize a gigabit port. Available copper links
and supported distances are more pervasive for lower speed links.
For example, 100Mbps NICs and switch ports are less expensive
than 1Gbps equipment.
Port trunking also allows end users to protect their investment in
existing infrastructure by reusing current equipment.
SNMP
( Simple Network Management Protocol ) A widely-used network
monitoring and control protocol. Data is passed from SNMP agents,
which are hardware and/or software processes reporting activity in
each network device ( hub, router, bridge, etc. ) to the workstation
console used to oversee the network. The agents return information
contained in a MIB ( Management Information Base ), which is a
data structure that defines what is obtainable from the device and
what can be controlled ( turned off, on, etc.). Originating in the UNIX
community, SNMP has become widely used on all major platforms.
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