Cisco
352-001 · Question #454
352-001 Question #454: Real Exam Question with Answer & Explanation
The correct answer is B: PortFast. PortFast and BPDU guard are applied together on access ports facing end hosts to enable immediate forwarding and prevent unauthorized switch connections.
Question
Refer to the exhibit. Which two Layer 2 features should be applied to the network location identified by a circle? (Choose two)
Options
- AUDLC
- BPortFast
- CPortFast trunk
- DBPDU filter
- Eloop guard
- FBPDU guard
Explanation
PortFast and BPDU guard are applied together on access ports facing end hosts to enable immediate forwarding and prevent unauthorized switch connections.
Common mistakes.
- A. UDLD detects unidirectional link failures on fiber and copper uplinks between switches; it is not applicable to access ports connecting end devices.
- C. PortFast trunk is designed for trunk ports on servers or hypervisors that must carry multiple VLANs without STP delays, not for standard access ports facing end hosts.
- D. BPDU filter silently discards BPDUs in both directions, which can mask topology issues and create loops; BPDU guard is the safe, recommended alternative for access ports.
- E. Loop guard protects root and designated ports on switch-to-switch links from going into a designated role due to a unidirectional failure; it is not intended for end-device access ports.
Concept tested. STP PortFast and BPDU guard on end-host access ports
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