Cisco
352-001 · Question #10
352-001 Question #10: Real Exam Question with Answer & Explanation
The correct answer is B: Use PortFast on access ports.. Optimizing an STP domain in a data center with HSRP on aggregation switches requires PortFast on server-facing ports, alignment of L2 and L3 forwarding paths, and explicit root bridge placement.
Question
Refer to the exhibit. Your company designed a network to allow server VLANs in a data center to span all access switches. In the design, Layer 3 VLAN interfaces and HSRP are configured on the aggregation switches. In which three ways should the design of the STP domain be optimized for server and application performance? (Choose three.)
Exhibit
Options
- AUse loop guard on access ports.
- BUse PortFast on access ports.
- CUse root guard on access ports.
- DAlign Layer 2 and Layer 3 forwarding paths.
- EUse BPDU Skew Detection on access ports.
- FExplicitly determine root and backup root bridges.
Explanation
Optimizing an STP domain in a data center with HSRP on aggregation switches requires PortFast on server-facing ports, alignment of L2 and L3 forwarding paths, and explicit root bridge placement.
Common mistakes.
- A. Loop guard is applied to non-designated uplink or backbone ports to protect against unidirectional link failures, not to access ports connected to servers.
- C. Root guard is placed on ports facing switches that should never be allowed to become the root bridge, typically downstream or external switch ports, not server-facing access ports.
- E. BPDU Skew Detection is a diagnostic monitoring feature that identifies inconsistent BPDU timing to detect CPU overload conditions, not a performance optimization for server traffic.
Concept tested. STP optimization for data center server VLANs with HSRP
Reference. https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10556-16.html
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