24-Port Managed Gigabit Switch
3.11 VLAN
3.11.1 What is a VLAN?
A Virtual Local Area Network (VLAN) defined in the IEEE802.1Q
standard, as can be inferred from the name allows you to create a
virtual LAN as which as far as the users are concerned behaves the
same way as a regular LAN does. It is a logical local area network
(or LAN) and a group of networking devices in the same broadcast t
domain that extends beyond a single traditional LAN to a group of
LAN segments. As a VLAN is a logical entity, its creation and
configuration is done completely in software. Logically speaking,
VLANs are also subnets.
Traditional network designs use routers to create broadcast
domains and limit broadcasts between multiple subnets. A VLAN
prevents broadcast floods in larger networks from consuming
resources, or causing unintentional denials of service unnecessarily.
With broadcast domain separation, VLANs can conserve bandwidth
and improve the network security by limiting traffic to specific
domains.
3.11.2 VLAN Advantages
Comparing with the traditional Ethernet network, VLAN has the
following advantages:
Broadcast Storm Control- Since each VLAN is an
independent collision domain as far as the network layer is
concerned, you could decrease the size of each VLAN when
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