Which two statements about the possible result of attaching the second link are true?

Refer to the exhibit. BPDUGuard is enabled on both ports of SwitchA. Initially, LinkA is connected and forwarding traffic. A new LinkB is then attached between SwitchA and HubA. Which two statements about the possible result of attaching the second link are true? (Choose two.)


A. The switch port attached to LinkB does not transition to up.
B. One or both of the two switch ports attached to the hub goes into the err-disabled state when a BPDU is received.
C. Both switch ports attached to the hub transitions to the blocking state.
D. A heavy traffic load could cause BPDU transmissions to be blocked and leave a switching loop.
E. The switch port attached to LinkA immediately transitions to the blocking state.

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3 thoughts on “Which two statements about the possible result of attaching the second link are true?

  1. Antword D is correct

    CCNP Routing and Switching SWITCH 300-115 Official Cert Guide
    Chapter 8: Protecting the Spanning Tree Protocol Topology Page 209

    Naturally, BPDU Guard does not prevent a bridging loop from forming if an Ethernet hub
    is connected to the PortFast port. This is because a hub does not transmit BPDUs itself; it
    merely repeats Ethernet frames from its other ports. A loop could form if the hub became
    connected to two locations in the network, providing a path for frames to be looped
    without any STP activity.

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