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    CCIE R&S 350-001 Q&As – Implement Spanning Tree Protocol (STP)(6-10)

    By admin | June 18, 2014

    Tagged with:

    Section 1 – Implement Spanning Tree Protocol (STP)

    QUESTION 6
    The classic Spanning Tree Protocol (802.1D 1998) uses which sequence of variables to determine the best received BPDU?
    A.    1) lowest root bridge id, 2) lowest sender bridge id, 3) lowest port id, 4) lowest root path cost
    B.    1) lowest root path cost, 2) lowest root bridge id, 3) lowest sender bridge id, 4) lowest sender port id
    C.    1) lowest root bridge id, 2) lowest sender bridge id, 3) lowest root path cost 4) lowest sender port id
    D.    1) lowest root bridge id, 2) lowest root path cost, 3) lowest sender bridge id, 4) lowest sender port id
    Answer: D

    Explanation:
    The parts of a BPDU are:
    * Root BID – This is the BID of the current root bridge.
    * Path cost to root bridge – This determines how far away the root bridge is. For example, if the data has to travel over three 100-Mbps segments to reach the root bridge, then the cost is (19 + 19 + 0) 38.
      The segment attached to the root bridge will normally have a path cost of zero.
    * Sender BID – This is the BID of the switch that sends the BPDU.
    * Port ID – This is the actual port on the switch that the BPDU was sent from.

    QUESTION 7
    Which three port states are used by RSTP 802.1w? (Choose three.)
    A.    Listening
    B.    Learning
    C.    Forwarding
    D.    Blocking
    E.    Discarding
    F.    Disabled
    Answer: BCE
    Explanation:
    STP (802.1D) Port State                 RSTP (802.1w) Port State
    Disabled                                             Discarding
    Blocking                                              Discarding
    Listening                                            Discarding
    Learning                                             Learning
    Forwarding                                         Forwarding

    QUESTION 8
    Which standard supports multiple instances of spanning tree?
    A.    802.1D
    B.    802.1s
    C.    802.1w
    D.    802.1z
    Answer: B
    Explanation:
    802.1s – Multiple Spanning Trees
    IEEE 802 local area networks (LANs) of all types may be connected together with media access control (MAC) bridges. IEEE Std 802.1Q specifies the operation of virtual local area network (VLAN) bridges, which support VLAN operation within an IEEE 802 bridged LAN. This Supplement to IEEE Std 802.1Q adds the facility for VLAN bridges to use multiple spanning trees, providing for traffic belonging to different VLANs to flow over potentially different paths within the virtual bridged LAN

    QUESTION 9
    Spanning Tree Protocol calculates path cost based on which of these?
    A.    interface bandwidth
    B.    interface delay
    C.    interface bandwidth and delay
    D.    hop count
    E.    bridge priority
    Answer: A
    Explanation:
    STP calculates the path cost based on the media speed (bandwidth) of the links between switches and the port cost of each port forwarding frame. Spanning tree selects the root port based on the path cost. The port with the lowest path cost to the root bridge becomes the root port. The root port is always in the forwarding state.
    If the speed/duplex of the port is changed, spanning tree recalculates the path cost automatically. A change in the path cost can change the spanning tree topology.

    QUESTION 10
    Refer to the exhibit. Which switching feature is being tested?

    39
    A.    loop guard
    B.    PortFast
    C.    root guard
    D.    BDPU guard
    Answer: A

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    Topics: Cisco, Exam | Comments Off on CCIE R&S 350-001 Q&As – Implement Spanning Tree Protocol (STP)(6-10)

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