VLANs can logically separate users into different broadcast domains even if they are physically located together. VLANs allow workstations in different buildings or floors to belong to the same logical LAN. A VLAN is a group of network devices that are on the same LAN but can be located on different network segments. VLANs can be configured statically by associating each port with a specific VLAN, or dynamically using software to determine VLAN membership based on device MAC addresses. Trunking allows multiple VLANs to share the same link between switches to conserve ports.

1. vLAN
vLANs can split up users into different subnets (broadcast
domains).
The Broadcast Frames are only switched on the same VLAN
ID.
This is not physical and workstations do not have to be
physically located together. Users on different floors on the
same building or in a different building can now belong to the
same LAN.
vLAN is a group of Network Devices that are on the same LAN.
They are configured as being attached to the same physical
connection even if they are located on a number of different LAN
segments.

2. VLAN Configurations.
Configuring VLANs Description
Statically
Network administrators configure port by
port.
Each Port is associated with
a specific VLAN.
The network administrator is
responsible for keying in the
mappings between the ports
and VLANs.
Dynamically
The ports are able to dynamically work out their
VLAN configuration.
Users a software database of
MAC address to VLAN
mappings
( which the network
administrator must set up
first)

3. By using switches, we can assign computer on different floors
to VLAN1, VLAN2, and VLAN3.
Now, logically, a department is spread across 3 floors even
though they are physically located on different floors.
LAN-VLAN

4. STATIC VLANS
Static membership VLANs are called port-based and port-centric membership
VLANs.
This is the main method used for assigning ports to VLANs.
As a device joins the network, it automatically assumes the VLAN membership of
the port to which it is attached.
There is a default VLAN, on Cisco switches that is VLAN 1.
Default
VLAN 1
Default
VLAN 1
Configured
Vlan 10

5. DYNAMIC VLANS
Dynamic membership VLANs are created through
network management software.
Dynamic VLANs allow for membership based on the
MAC address of the device connected to the switch
port.
As a device enters the network, it asks a database
within the switch for a VLAN membership.

6. VLAN TRUNKING
In a switched network, a trunk is a point-to-point link that
supports several VLANs.
The purpose of a trunk is to conserve ports when a link
between two devices that implement VLANs is created.

7. VLAN TRUNKING
In a switched network, a trunk is a point-to-point link that
supports several VLANs.
The purpose of a trunk is to conserve ports when a link
between two devices that implement VLANs is created.