52. Which technology is used to protect the switched infrastructure from problems caused by receiving BPDUs on ports that should not be receiving them?
- Loop guard
- PortFast
- BPDU guard
- RSPAN
- Root guard
Explanation: To form a single path through a Layer 2 network, Layer 2 devices communicate with one another by the use of bridge protocol data units (BPDUs) as part of the Spanning Tree Protocol (STP). An attacker manipulates STP by spoofing the root bridge so that a device that is controlled by the attacker becomes a root bridge. The attacker can then obtain more information about the network or networks. BPDU guard can be used on ports that connect to user devices that are configured with PortFast so that BPDUs will not be accepted through that port.
Exam with this question: CCNPv8 ENCOR (Version 8.0) - L2 Redundancy Exam
Exam with this question: CCNA Security Chapter 6 Exam (CCNAS v1.2)
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