350-401 Question #877: Real Exam Question with Answer & Explanation

Question

Which of the following statements are true regarding the Link Management Protocol (LMP) when used in the Cisco Stackwise virtual link? (Choose two.)

Options

• AIt determines the switch priority.
• BIt negotiates the version of the virtual header
• CIt verifies link integrity via bidirectional forwarding
• DIt performs auto discovery of other active Stackwise switches

Explanation

LMP in Cisco StackWise Virtual

Why B and C are correct: LMP (Link Management Protocol) in StackWise Virtual serves two key functions: it negotiates the version of the virtual stack header (B) to ensure both switches use compatible encapsulation for inter-switch communication, and it verifies link integrity through bidirectional checks (C), confirming that traffic can flow successfully in both directions across the StackWise Virtual Link (SVL).

Why the distractors are wrong: Option A is incorrect because switch priority (determining which switch becomes the Active vs. Standby) is handled through a separate election process, not LMP. Option D is incorrect because auto-discovery of StackWise switches is not an LMP function - StackWise Virtual requires manual configuration of the SVL links, unlike protocols such as CDP or a dedicated discovery mechanism.

Memory Tip: Think of LMP as a "handshake and health check" protocol - it first negotiates the rules of communication (version/header), then verifies the connection is healthy (bidirectional integrity). Anything related to elections or discovery falls outside LMP's scope. The acronym "LMP = Link Management Protocol = Language + Monitor" can help you recall negotiation and verification as its two jobs.

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