Cisco
400-007 · Question #202
400-007 Question #202: Real Exam Question with Answer & Explanation
The correct answer is C: Each spine switch must connect to every leaf switch. Spine-leaf topology enforces full cross-tier connectivity - every leaf connects to every spine and vice versa - while prohibiting same-tier links to guarantee predictable two-hop east-west paths.
Question
What are two design constraints in a standard spine and leaf architecture? (Choose two.)
Options
- ASpine switches can connect to each other
- BEndpoints connect only to the spine switches
- CEach spine switch must connect to every leaf switch
- DLeaf switches must connect to each other
- EEach leaf switch must connect to every spine switch
Explanation
Spine-leaf topology enforces full cross-tier connectivity - every leaf connects to every spine and vice versa - while prohibiting same-tier links to guarantee predictable two-hop east-west paths.
Common mistakes.
- A. Spine switches do not connect to each other - inter-spine links are prohibited because the spine tier functions exclusively as an interconnect layer for leaf switches.
- B. Endpoints connect only to leaf switches, not to spine switches - spine switches carry only inter-leaf transit traffic.
- D. Leaf switches do not connect to each other - inter-leaf links are prohibited because all inter-leaf traffic must traverse the spine tier to maintain the two-hop topology guarantee.
Concept tested. Spine-leaf architecture topology design constraints
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