Introduction ToDLL

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Introduction to Data-Link Layer Presented by : Abdulaziz Mabrouk Tagawy

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The first section introduces the data-link layer. It starts with defining the conceptof links and nodes. The section then lists and briefly describes the services providedby the data-link layer. It next defines two categories of links: point-to-pointand broadcast links. The section finally defines two sublayers at the data-link layerthat will be elaborated on in the next few chapters.. The second section discusses link-layer addressing. It first explains the rationalebehind the existence of an addressing mechanism at the data-link layer. It thendescribes three types of link-layer addresses to be found in some link-layer protocols.The section discusses the Address Resolution Protocol (ARP), which mapsthe addresses at the network layer to addresses at the data-link layer. This protocolhelps a packet at the network layer find the link-layer address of the next node fordelivery of the frame that encapsulates the packet. To show how the network layerhelps us to find the data-link-layer addresses, a long example is included in thissection that shows what happens at each node when a packet is travelling throughthe Internet.

Transcript of Introduction ToDLL

  • Introduction to Data-Link Layer

    Presented by : Abdulaziz Mabrouk Tagawy

  • Nodes and Links

    Communication at the data-link layer is node-to-node.

    Refer to the two end hosts and the routers as nodes

    Refer to the networks in between as links.

  • Services

  • Services

    Framing

    Flow Control

    Error Control

    Congestion Control

  • Two Categories of Links

    point-to-point link, the link is dedicated to the two devices .

    broadcast link, the link is shared between several pairs of devices.

    For example, when two friends use the traditional home phones to chat, they are using a point-to-point link; when the same two friends use their cellular phones, they are using a broadcast link (the air is shared among many cell phone users).

  • Two Sublayers

    data link control (DLC)

    Media access control (MAC).

  • LINK-LAYER ADDRESSING

  • Three Types of addresses

    Unicast Address

    A3:34:45:11:92:F1

    Multicast Address

    A2:34:45:11:92:F1

    Broadcast Address

    FF:FF:FF:FF:FF:FF

  • Address Resolution Protocol (ARP)

  • Address Resolution Protocol (ARP)

    An Example of Communication


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