Network LayerCompTIA Network+ Course

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This topic contains 1 reply, has 2 voices, and was last updated by  Paul Rouk 2 years, 1 month ago.

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  • #89523

    abhi437
    Participant

    Network Layer is commonly referred as IP layer. Does it means that data link layer does not use IP Address?

    #89534

    Paul Rouk
    Participant

    Yes, that is essentially true. Keep in mind that data moving from one computer to a different computer over the Internet will typically use all seven layers of the OSI model, so it isn’t like you are sending data using layer 2 but not layer 3. Instead, the OSI model helps to understand how the data is packaged at each step as it travels from source to destination.

    The IP address (layer 3) is used to route a packet from one network to a different one anywhere else in the world. The MAC address (layer 2) is used purely on the local network. Once a data packet has arrived at the destination network, “arp” is used to match up the IP address with the MAC address of the actual computer. The data is then forwarded to the computer using the MAC address.

    Below are two links with good discussions of how this works.

    http://www.webopedia.com/DidYouKnow/Computer_Science/understanding_layers.asp

    What Exactly Is a MAC Address Used For?

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