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Configuring Virtual Lans

The document discusses configuring a company's network using virtual LANs (VLANs) to separate its three departments logically. It will create three VLANs - one each for the Administration, Development, and Production departments. This will prevent the Development department from accessing sensitive information in the other departments, even though they are on the same physical network. VLANs act as separate logical networks that require a router to communicate between them, enhancing network security.

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Sheraz Khan
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36 views8 pages

Configuring Virtual Lans

The document discusses configuring a company's network using virtual LANs (VLANs) to separate its three departments logically. It will create three VLANs - one each for the Administration, Development, and Production departments. This will prevent the Development department from accessing sensitive information in the other departments, even though they are on the same physical network. VLANs act as separate logical networks that require a router to communicate between them, enhancing network security.

Uploaded by

Sheraz Khan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Lab # 12

Configuring Virtual LANs


• Company has three floors.
• Three departments ( Production, Development and Admin )
• Administration and production department have sensitive information and need
to be separate from development department.
• With default configuration, all computers share same broadcast domain.
Development department can access the administration or production
department resources.

SWITCH 1 SWITCH 2 SWITCH 3

DEV 1 DEV 2 PROD 1 ADMIN 1 PROD 3 ADMIN 3


DEV 3 DEV 4 PROD 2 ADMIN 2 DEV 5 DEV 6
Virtual LANs
• A virtual LAN is a group of hosts with a
common set of requirements that
communicate as if they were attached to the
same broadcast domain.
• Logical grouping of network devices.
• Same as two different subnets cannot
communicate with each other without router,
different VLANs also requires router to
communicate.
With VLAN we could create logical boundaries over the physical network. Assume
that we created three VLANs for our network and assigned them to the related
computers.

• VLAN Admin for Administration department


• VLAN Dev for Development department
• VLAN Pro for Production department

SWITCH 1 SWITCH 2 SWITCH 3

DEV 1 DEV 2 PROD 1 ADMIN 1 PROD 3 ADMIN 3


DEV 3 DEV 4 PROD 2 ADMIN 2 DEV 5 DEV 6
Logically our network looks like following diagram.

Router

SWITCH 1 SWITCH 2 SWITCH 3

DEV 3 DEV 4 DEV


DEV66
PROD 1

VLAN Admin VLAN Dev VLAN Pro


• With the help of VLAN, we have separated our
single network in three small networks.
• Now Development department cannot access
the Administration and Production
department directly.
• Different VLAN can communicate only via
Router where we can configure wild range of
security options.
VLAN Connections
Switch supports two types of VLAN connection
• Access link
The access links are part of only one VLAN and
carry traffic to only the end devices connected
to that particular VLAN
• Trunk link
This is used to connect switches to other
switches and can carry traffic from multiple
VLANs.
PC PC PC PC PC PC
VLAN 1

Access
links Trunk
link
S1 S2

VLAN 2

PC PC PC PC PC PC

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