ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

Define Vlan and its use

Updated on September 1, 2008

What is VLAN and its basics. Listout the uses of VLAN

 

Definition of VLAN:

VLANs are used to segment the network into smaller broadcast domain or segments. In otherword VLAN is a logical grouping of network users and resources connected administratively to defined ports on a switch.The primary reason to segment your network is to relieve network congestion and increase bandwidth.By creating VLANs, you are able to create smaller broadcast domains within a switch by assigning different ports on the switch to different subnetworks. Ports assigned to the VLAN to which the node sending the broadcast is assigned will receive that broadcast.

Why use VLAN:

VLAN is like placing a router to stop broadcasts between each individual VLAN. Routers are like bug poison-they kill broadcasts dead. Broadcast can't escape through routers and they can't escape a VLAN, eigher. Each VLAN becomes its own invididual broadcast domain. When a network node or workstation sends out an advertisement or broadcast to the other nodes on a segment, only the nodes assigned to the VLAN to which the node sending the broadcast is assinged will receive that broadcast.

Using Virtual LANs, you're no longer confined to physical locations. VLANs can be organized by location, function, department, or even the application or protocol used, regardless of where the resources or users are located. In a flat network topology, your broadcast domain consists of all the interfaces in your segment or subnet. If no devices-such as switches or routers-divide your network, you have only one broadcast domain. On some switches, an almost limitless number of broadcast domains or VLANs can be configured.

VLAN Basics

Inter-Switch Link (ISL) protocol was designed to allow VLAN traffic to flow from one Cisco device to another. The protocols adds a header that uniquely identifies the source and destinations of the data as well as the VLAN the data is a member of. If data from one VLAN needs to be forwarded to another VLAN, it requires some type of Layer 3 routing.

Spanning Tree Protocol(STP), which can be applied to each individual VLAN, keeps the network from forming bridging loops when a packet can reach a given destination multiple ways. This means you can provide multiple ways to get data from Point A in your network to Point B, thereby providing redundancy in case one link fails. STP blocks the redundant ports so only one path exists for data in the network.

VLANs allow you to use these links to load balance data. By assigning different VLANs to each link, data from one VLAN can use one link and another VLAN can use the second, redundant link. A VLAN would use the other link only during a link failure in the network, in this case the VLANs assigned to the lost link would converge and use the link that was still available.

If you are a Networking Professional and want a job in Wipro. Visit my hub

http://hubpages.com/_cfghjb7oiy1d/hub/Wipro-hires-people-with-experience-in-networking

Comments

    0 of 8192 characters used
    Post Comment

    • profile image

      suresh 

      4 years ago

      Thank u very much for sharing your knowledge................thank u

    • profile image

      James Whyte 

      6 years ago

      I think you will find this page interesting: http://www.ozekiphone.com/what-is-vlan-342.html

      It contains a lot of information, including the definition of VLAN, a video and Ozeki Phone System XE.

      Have fun! :)

    • profile image

      rax 

      6 years ago

      thanks

    • profile image

      dipi joseph 

      6 years ago

      thanks

    • profile image

      Hedayat 

      6 years ago

      The way explained is very good, actually i was look for this type..

      Thanks brother in humanity

    • profile image

      MAHI 

      7 years ago

      great knowledge about networking....really impressed with your hub....have a look for this one....i am sure it will make you amaze... thanx....

    • profile image

      Aljohn T J 

      7 years ago

      Thanks...........

    • profile image

      Hari 

      8 years ago

      Hi this is good to job seekers

    • britneydavidson profile image

      britneydavidson 

      9 years ago from united kingdom

      great hub....excellent information....thanx for sharing it....you have great knowledge about networking....really impressed with your hub....have a look for this one....i am sure it will make you amaze... thanx....

      https://hubpages.com/art/Worlds-Most-Expensive-iPh...

      https://hubpages.com/technology/24-carat-gold-and-...

      thanx

    working

    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://hubpages.com/privacy-policy#gdpr

    Show Details
    Necessary
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Features
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Marketing
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Statistics
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)