VIRTUAL LAN TECHNOLOGY

SEMINAR ON

Basic Devices In Network Backbone1. Bridges

2. Switches

3. Routers

4. Hubs

LANLocal Area Network is network of computers

located within the same area

Network as a single broadcast domain

Routers take more time to process incoming data

Physical view of LAN

VLAN VLAN stands for Virtual Local Area Network. Viewed as a group of devices on different physical

LAN

can communicate with each other as if they were all on the same physical LAN

• Configured through software rather than hardware

• extremely flexible

Physical view of VLAN

How VLAN Work...?

VLAN typesLayer1- Port-based VLANs Layer2 - MAC address based VLANs Layer3 - Protocol based VLANs

Layer-1 VLANsPort-based VLANs

Uses the physical layer port number on the front of the VLAN switch to assign computers to VLAN segments

Network manager must know which computer is connected to which port

AdvantageConfiguration is fairly

straightforward

Vlan defined by port

Layer-2 VLANsMAC-based VLANsUses the data link layer

address to form the VLANs

Advantage:Simpler to manage when

computers are moved No configuration needed

Layer-3 VLANsIP-based VLANs

Uses the network layer address to form the VLANs

Compared to Layer-2:Reduce the time spent

reconfiguring the network

A bit slower at processing each message

Advantage:Can manually

input/change IP addresses

NO configuration is needed

Multi-Switch VLAN

Multi-Switch VLAN cont.Works the same way as a Single-Switch

VLAN, except:

Several switches are used

Advantage:Incresed performanceIncreased security option

Benefit of VLANsThe key benefit of VLANs is that they permit the network administrator to organize the LAN logically instead of physically.

Why use VLAN’s.?Performance

Formation of virtual workgroups

Simplified administration

Reduced cost

Security

1. Communication Problem

2.Complexity

3.Capacity

4.Infection

Disadvantages

ConclusionReduce the cost of dealing with moves and

changes

For organizations,seen as an added benefit

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