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giup minh tra loi

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  • giup minh tra loi

    cau 1
    The Certkiller switches have been implemented with the extended ID system feature.
    Which two statements are true when the extended system ID feature is enabled?
    (Select two)
    A. The BID is made up of the bridge priority (four bits), the system ID (12 bits), and a
    bridge MAC address (48 bits).
    B. The BID is made up of the system ID (six bytes) and bridge priority value (two bytes).
    C. The BID is made up of the bridge priority value(two bytes) and bridge MAC address
    (six bytes).
    D. The system ID value is a unique MAC address allocated from a pool of MAC
    addresses assigned to the switch or module.
    E. The system ID value is a hex number used to measure the preference of a bridge in the
    spanning-tree algorithm.
    F. The system ID value is the VLAN ID (VID).

    cau 2
    A change in the Certkiller spanning tree network is being propagated to all STP
    devices. How are STP timers and state transitions affected when a topology change
    occurs in an STP environment?
    A. All ports will temporarily transition to the learning state for a period equal to the max
    age timer plus the forward delay interval.
    B. The default hello time for configuration BDPUs will be reduced for the period of the
    max age timer.
    C. The default aging time for MAC address entries will be reduced for a period of the
    max age timer plus the forward delay interval.
    D. All ports will transition temporarily to the learning state for a period equal to the
    forward delay interval.
    E. None of the above.

    cau 3
    What is true of a topology change in an STP environment?
    A. The default aging time for MAC address entries will be reduced for a period of the
    max_age timer plus the forward_delay interval.
    B. All ports will transition temporarily to the learning state for a period equal to the
    forward_delay interval.
    C. All ports will temporarily transition to the learning state for a period equal to the
    max_age timer plus the forward_delay interval.
    D. The default hello_timer for configuration BDPUs will be reduced for the period of the
    max_age timer.

    cau4
    Switch CK1 has been configured with the root guard feature. What statement is
    true if the spanning tree enhancement Root Guard is enabled?
    A. If BPDUs are not received on a non-designated port, the port is moved into the STP
    loop-inconsistent blocked state
    B. IF BPDUs are received on a PortFast enabled port, the port is disabled.
    C. If superior BPDUs are received on a designated port, the interface is placed into the
    root-inconsistent blocked state.
    D. If inferior BPDUs are received on a root port, all blocked ports become alternate paths
    to the root bride.

  • #2
    Theo mình, đáp án cho câu 1 là : A, F (sau khi anh Minh trả lời về extended ID system feature, bây giờ đã hiểu,hehe).

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