352-011 · Question #72
Refer to the exhibit. You are designing a data center migration from one location to another, which requires all existing VLANs spanned to the new data center to maintain host IP addressing. Two…
The correct answer is A. Perform BPDU filtering over the trunk links. BPDU filtering on the inter-DC trunk links prevents Spanning Tree Protocol (STP) BPDUs from crossing between the two data centers, effectively creating independent STP domains in each location - so a topology change, loop, or reconvergence event in one DC cannot propagate to…
Question
Refer to the exhibit. You are designing a data center migration from one location to another, which requires all existing VLANs spanned to the new data center to maintain host IP addressing. Two temporary Gigabit Ethernet circuits are available to extend the VLANs at Layer 2 to the location as trunk links between core switches in each location. Which solution provides maximum fault isolation between the two data centers to ensure a Layer Issue in one data center does not affect the other during the migration?
Exhibit
Options
- APerform BPDU filtering over the trunk links
- BEnable STP PortFast on host ports within each data center
- CRun the dual links as multichassis Etherchannel trunk between core switches within each location
- DPerform HSRP filtering over the trunk links to maintain active HSRP gateways within each data
How the community answered
(39 responses)- A67% (26)
- B18% (7)
- C10% (4)
- D5% (2)
Explanation
BPDU filtering on the inter-DC trunk links prevents Spanning Tree Protocol (STP) BPDUs from crossing between the two data centers, effectively creating independent STP domains in each location - so a topology change, loop, or reconvergence event in one DC cannot propagate to the other. B is wrong because PortFast only speeds up host port transitions and does nothing to isolate STP domains between sites. C is wrong because multichassis EtherChannel adds link redundancy but actually tightens Layer 2 coupling between the DCs, doing the opposite of isolating them. D is wrong because HSRP is a Layer 3 gateway redundancy protocol - filtering it addresses gateway failover behavior, not Layer 2 fault containment.
Memory tip: Think of BPDUs as "STP gossip" - if you filter that gossip at the border (the inter-DC trunk), bad news (loops, TCNs) stays local and never reaches the other site. BPDU filter = Layer 2 quarantine.
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