Everyday Guide » What is The Data Link Layer http://www.everydayguide.com DIY and How To Newspaper Wed, 08 Feb 2012 21:10:52 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 What is the Data Link Layer? http://www.everydayguide.com/what-is-the-data-link-layer/ http://www.everydayguide.com/what-is-the-data-link-layer/#comments Thu, 01 Sep 2011 10:35:39 +0000 admin http://www.everydayguide.com/?p=2105 What is data link layerThis is the second layer on the OSI model. The purpose of this layer is the provision of a reliable transfer of data/information across a physical network link. Different layer specifications are used to classify the different protocol and network characteristics. For instance, error notification, network topology, physical addressing, flow control and frame sequencing. Physical [...] Related posts:
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]]> This is the second layer on the OSI model. The purpose of this layer is the provision of a reliable transfer of data/information across a physical network link. Different layer specifications are used to classify the different protocol and network characteristics. For instance, error notification, network topology, physical addressing, flow control and frame sequencing. Physical addressing is used to identify just how the devices are dealt with at the link area. In network topology, the link specifications in this case are for the purposes of defining how the devices are going to be connected physically. For example, is it the bus or the ring topology to be used? On the other hand, the error notification is applied for alerting the protocols on the upper layer when a transmission inaccuracy occurs. Whenever frames are broadcasted out of the required series, data frame sequencing is used to reorder the frames.

data link layer What is the Data Link Layer?

Data link layer

Networking is all about the broadcasting of information. The flow control moderates this transmission so that the devices that will receive are not in any way weighed down with traffic that they cannot handle. The data link has been divided into two sub-layers by the Institute of Electronic Engineers. These are the Logical Link Control abbreviated as LLC and the Media Access Control abbreviated as MAC. Accordingly, the Logical Link Control, is used for the purposes of managing device communication over a single network link. The Media Access Control is used to manage protocol access to the physical network medium. Using the MAC address specifications, multiple devices can then identify each other at the data link layer.

Thus, the data link layer permits a device to easily access the network for purposes of sending and receiving information and data. Secondly, the layer gives physical addresses. This then helps the devices to send their data on the network. Thirdly, through cooperation with the networking software of the devices, it allows for the sending and receiving of messages. Lastly, it provides the means through which any errors that may occur are detected. The layer makes use of certain networking components. For instance, the network interfacing cards (NIC), bridges and the Token Ring and Ethernet switches. The network interface cards often have a data link or a media access control (MAC) address. In the process of filtering and forwarding data traffic, a switch makes the use of a layer 2 (data link) address. This way network congestion and collision is avoided.

Related posts:

  1. What is the Session Layer?
  2. What is the Presentation Layer?
  3. What is the Transport Layer?

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