This document discusses VLANs (virtual local area networks). It defines LANs and VLANs, explaining that VLANs logically segment networks based on functions or teams rather than physical connections. It describes static and dynamic VLAN implementation methods and port-based, MAC address-based, and protocol-based VLAN types. Finally, it outlines benefits of VLANs such as easy network changes, traffic control, and improved security.

1. ID:16MSIT038
- Darshan

2. Index
• LAN
• VLAN
• Implementation of VLAN
• Types Of VLAN
• Benefits of VLAN
• Bibliography

3. • A Local Area Network (LAN) was
originally defined as a network of
computers located within the same area.
• Local Area Networks are defined as a
single broadcast domain. This means
that if a user broadcasts information on
his/her LAN, the broadcast will be
received by every other user on the LAN.
• Broadcasts are prevented from leaving a
LAN by using a router. The disadvantage
of this method is routers usually take
more time to process incoming data
compared to a bridge or a switch
LAN

4. VLAN
• VLANs provide segmentation
based on broadcast domains.
• VLANs logically segment
switched networks based on the
functions, project teams, or
applications of the organization
regardless of the physical
location or connections to the
network.
• All workstations and servers
used by a particular workgroup
share the same VLAN,
regardless of the physical
connection or location.

5. Implementation of VLAN
Statically • Network Administrator configure port-by-port.
• Each port is associate with a specific VLAN.
• The network administrator is responsible keying in
the mappings between the port and VLANs.
Dynamically • The port are able to dynamically work out their VLAN
configuration.
• Uses a software database of MAC address to VLAN
mappings (Which the network administrator must set
up first).

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Port
VLAN
• Static membership VLANs are called port-based and port-centric
membership VLANs.
• As a device enters the network, it automatically assumes the VLAN
membership of the port to which it is attached.

7. • Dynamic membership VLANs are created through network management
software. (Not as common as static VLANs)
• CiscoWorks 2000 or CiscoWorks for Switched Internetworks is used to
create Dynamic VLANs.
• 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 queries a database within the switch for
a VLAN membership.

8. Types Of VLAN
Port Base:
• Most common configuration
method.
• Port assign individually, in group, in
rows, or across 2 or more switches.
• Simple to use.
MAC Address:
• Rarely implemented today.
• Each address must be entered into the switch and configured individually.
• User find it useful.
Protocol Base:
• Configured like MAC address, but instead uses a logical or IP address.
• No longer common because of DHCP.

9. Benefits of VLANs
• The key benefit of VLANs is that they permit the network administrator to
organize the LAN logically instead of physically.
• This means that an administrator is able to do all of the following:
 Easily move workstations on the LAN.
 Easily add workstations to the LAN.
 Easily change the LAN configuration.
 Easily control network traffic.
 Improve security.

10. Bibliography
• Wikipedia:
https://en.wikipedia.org/wiki/Virtual_LAN
• http://www.slideshare.net/
• http://www.cisco.com