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全部科目 > 软件认证工程师考试 > 思科认证考试 > CCNA系列认证 > CCNA(640-802)

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For what two purposes does the Ethernet protocol use physical addresses?()

    A. to uniquely identify devices at Layer 2
    B. to allow communication with devices on a different network
    C. to differentiate a Layer 2 frame from a Layer 3 packet
    D. to establish a priority system to determine which device gets to transmit first
    E. to allow communication between different devices on the same network
    F. to allow detection of a remote device when its physical address is unknown

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