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  • March 26,2016

    OSI for CCNA Layer 3: Network

    The CCNA exam covers data packets; the network layer routes data packets across networks that link the sending and the receiving host. In a nutshell,...

  • March 26,2016

    OSI for CCNA Layer 2: Data Link

    The CCNA exam has extensive coverage of data routing. Data routing is handled by the data link layer of the OSI. The data link layer does the followin...