VLAN
Vlan is Broadcaste domain created by Switch.
Data should communicate be same Vlan in switches.
Data should has to communicate different Vlan then
its require Layer-3.
It eliminates unnecessary broadcast traffic,
improving, performance and scalability.
For Security it’s logically separates users and
departments, allowing administrators to implement access-lists to control
traffic between VLANs.
It provide flexibility to add and remove the number
of host.
Vlan
Range
VLAN 0 & 4095-
These are reserved VLAN which cannot be seen or
used.
VLAN 1-
It is the default VLAN of switches.
VLAN 2 to 1001-
This is a
normal VLAN range, we can create, edit and delete these VLAN.
VLAN 1002 to 1005-
These are use
only for fddi and token rings.
Vlan 1006 to 4094-
This is use for High standard devices extended range
of Vlan.
Vlan
Port Type
Access port-
It is a member of only a single VLAN & used to
connect host devices, such as computers and printers. By default all switch
ports are access ports in cisco devices.
Trunk port-
It’s a port which belong to multiple vlan.
Protocol
Type
Inter-Switch Link (ISL)-
Its also called as “Double Tagging” & its cisco
proprietary.
It encapsulates & Decapsulate on every frame while
going across trunk.
It does not understand Native Vlan.
ISL supports upto 1000 Vlans.
DOT1q-
Its IEEE standard- IEEE 802.1q,its also called as “Single
Tagging”.
It Tag & Untag the frame while going across
trunk.
It can understand Native Vlan.
VLAN can vary from 1
to 4094
Its very simple & easy, i will refer your notes for interview purpose
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