350-601: Implementing and Operating Cisco Data Center Core TechnologiesDemo

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QuestionQ254

Network

An engineer needs to implement a solution that prevents loops caused by accidentally connecting a switch to interface Ethernet1/1. The port is designated for host connectivity. Which configuration should be implemented?

  • A switch# configure terminal switch(config)# interface Ethernet1/1 switch(config-if)# spanning-tree bpduguard enable
  • B switch# configure terminal switch(config)# interface Ethernet1/1 switch(config-if)# spanning-tree guard loop
  • C switch# configure terminal switch(config)# interface Ethernet1/1 switch(config-if)# spanning-tree loopguard default
  • D switch# configure terminal switch(config)# interface Ethernet1/1 switch(config-if)# spanning-tree bpdufilter enable
Explanation

BPDU Guard is intended for host-facing edge interfaces. If the interface receives a BPDU, it is placed into an error-disabled state, preventing a newly connected switch from creating a Layer 2 loop. Loop Guard addresses loss of BPDUs on network links, while BPDU Filter suppresses STP BPDUs and can permit loops.

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