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VLAN
A Virtual LAN (VLAN) is a group of ports that form a logical
Ethernet segment on a Layer 2 Switch which provides better
administration, security, and management of multicast
trafc.AVLANisanetworktopologyconguredaccording
to a logical scheme rather than a physical layout. When you
use a VLAN, users can be grouped by logical function instead
of physical location. All ports that frequently communicate
with each other are assigned to the same VLAN, regardless
of where they are physically on the network. VLANs let you
logically segment your network into different broadcast
domains so that you can group ports with related functions
into their own separate, logical LAN segments on the same
Switch. This allows broadcast packets to be forwarded only
between ports within the VLAN which can avoid broadcast
packets being sent to all the ports on a single Switch. A
VLAN also increases network performance by limiting
broadcasts to a smaller and more manageable logical
broadcast domain. VLANs also improve security by limiting
trafctospecicbroadcastdomains.
802.1Q
Each VLAN in a network has an associated VLAN ID, which
appears in the IEEE 802.1Q tag in the Layer 2 header
of packets transmitted on a VLAN. The IEEE802.1Q
specication establishes a standard method for tagging
Ethernet frames with VLAN membership information.
The key for IEEE802.1Q to perform its functions is in its
tags.802.1Q-compliantSwitchportscanbeconguredto
transmittaggedoruntaggedframes.Atageldcontaining
VLAN information can be inserted into an Ethernet frame.
When using 802.1Q VLAN conguration, you congure
ports to be a part of a VLAN group. When a port receives
data tagged for a VLAN group, the data is discarded unless
the port is a member of the VLAN group.
123


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