what is VLAN please simplify?

Question

please mention some of the url where it is in simplified form

Answer 1

VIRTUAL LOCAL AREA NETWORK(VLAN)





Virtual LAN - Wikipedia, the free encyclopedia

Jump to Cisco VLAN Trunking Protocol (VTP): On Cisco Devices, VTP (VLAN Trunking Protocol) maintains VLAN configuration consistency across the entire ...

Uses - Motivation - Protocols and design

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IEEE 802.1Q - Wikipedia, the free encyclopedia

Jump to Multiple VLAN Registration Protocol: In addition, IEEE 802.1Q defines Multiple VLAN Registration Protocol (MVRP), an application of the ...

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What is a VLAN? How to Setup a VLAN on a Cisco Switch

What is a VLAN? How to Setup a VLAN on a Cisco Switch Have you ever wondered what a Virtual LAN (or VLAN) is or been unclear as to why you would want.

www.petri.co.il/csc_setup_a_vlan_on_a_cisco_switch.htm - Cached - Similar

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Image results for vlan

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What is a VLAN?

The acronym VLAN expands to Virtual Local Area Network. A VLAN is a logical local area network (or LAN) that extends beyond a single traditional LAN to a ...

www.tech-faq.com/vlan.shtml - Cached - Similar

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Virtual Local Area Networks

14 Aug 1997 ... This paper describes virtual local area networks (VLAN's) , their usesand how they work in accordance with the 802.1Q standard.

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VLAN Information

29 Oct 1998 ... The purpose of this document is to provide a better understanding of Virtual Local Area Networks (VLANs) and their use in the Network 21 ...

net21.ucdavis.edu/newvlan.htm - Cached - Similar

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VLAN Tutorials

Provides links to VLAN tutorials, information, and resources that are rated by you.

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802.1Q VLAN implementation for Linux

802.1Q VLAN code is now part of the official kernel, and has been for years and years. MAC-VLAN code has been added since around 2.6.29. ...

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VLANs and Trunking > VLAN Configuration

VLANs are defined on a switch in an internal database known as the VLAN Trunking Protocol (VTP) database. After a VLAN has been created, ports are assigned ...

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The Virtual LAN The Virtual LAN

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VLAN membership can be defined, this paper divides VLAN solutions into four general ... to be in at least one VLAN. After that initial ...

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Answer 2

A VLAN is a virtual local area network. Try posting your question under Computers to get a better answer... just a bunch of math geeks over here.... :)

Answer 3

The Basic Definition

The acronym VLAN expands to Virtual Local Area Network. A VLAN is a logical local area network (or LAN) that extends beyond a single traditional LAN to a group of LAN segments, given specific configurations. Because a VLAN is a logical entity, its creation and configuration is done completely in software.



How Is a VLAN Identified

Since a VLAN is a software concept, identifiers and configurations for a VLAN must be properly prepared for it to function as expected. Frame coloring is the process used to ensure that VLAN members or groups are properly identified and handled. With frame coloring, packets are given the proper VLAN ID at their origin so that they may be properly processed as they pass through the network. The VLAN ID is then used to enable switching and routing engines to make the appropriate decisions as defined in the VLAN configuration.



Why Use VLANs

Traditional network designs use routers to create broadcast domains and limit broadcasts between multiple subnets. This prevents broadcast floods in larger networks from consuming resources, or causing unintentional denials of service unnecessarily. Unfortunately, the traditional network design methodology has some flaws in design



Geographic Focus - Traditional network designs focus on physical locations of equipment and personnel for addressing and LAN segment placement. Because of this there are a few significant drawbacks:

Network segments for physically disjointed organizations cannot be part of the same address space. Each physical location must be addressed independently, and be part of its own broadcast domain. This can force personnel to be located in a central location, or to have additional latency or connectivity shortfalls.

Relocations of personnel and departments can become difficult, especially if the original location retains its network segments. Relocated equipment will have to be reconfigured based on the new network configuration.

A VLAN solution can alleviate both of these drawbacks by permitting the same broadcast domain to extend beyond a single segment.



Additional Bandwidth Usage - Traditional network designs require additional bandwidth because packets have to pass through multiple levels of network connectivity because the network is segmented.

A proper VLAN design can ensure that only devices that have that VLAN defined on it will receive and forward packets intended as source or destination of the network flow.



Types of VLAN

There are only two types of VLAN possible today, cell-based VLANs and frame-based VLANs.



Cell-based VLANs are used in ATM switched networks with LAN Emulation (or LANE). LANE is used to allow hosts on legacy LAN segments to communicate using ATM networks without having to use special hardware or software modification.

Frame-based VLANs are used in ethernet networks with frame tagging. The two primary types of frame tagging are IEEE 802.10 and ISL (Inter Switch Link is a Cisco proprietary frame-tagging). Keep in mind that the 802.10 standard makes it possible to deploy VLANs with 802.3 (Ethernet), 802.5 (Token-Ring), and FDDI, but ethernet is most common.

VLAN modes

There are three different modes in which a VLAN can be configured. These modes are covered below:



VLAN Switching Mode - The VLAN forms a switching bridge in which frames are forwarded unmodified.

VLAN Translation Mode - VLAN translation mode is used when the frame tagging method is changed in the network path, or if the frame traverses from a VLAN group to a legacy or native interface which is not configured in a VLAN. When the packet is to pass into a native interface, the VLAN tag is removed so that the packet can properly enter the native interface.

VLAN Routing Mode - When a packet is routed from one VLAN to a different VLAN, you use VLAN routing mode. The packet is modified, usually by a router, which places its own MAC address as the source, and then changes the VLAN ID of the packet.

VLAN configurations

Different terminology is used between different hardware manufacturers when it comes to VLANs. Because of this there is often confusion at implementation time. Following are a few details, and some examples to assist you in defining your VLANs so confusion is not an issue.



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