350-401 Question #620: Real Exam Question with Answer & Explanation

Question

Which action is performed by Link Management Protocol in a Cisco StackWise Virtual domain?

Options

• AIt rejects any unidirectional link traffic forwarding
• BIt determines if the hardware is compatible to form the StackWise Virtual domain
• Cdiscovers the StackWise domain and brings up SVL interfaces.
• DIt determines which switch becomes active or standby

Explanation

Link Management Protocol (LMP) in Cisco StackWise Virtual

LMP (Link Management Protocol) in a StackWise Virtual domain specifically monitors SVL (StackWise Virtual Link) connections and rejects unidirectional link traffic forwarding - meaning if a link can only send in one direction (a common fault condition), LMP detects this and prevents traffic from being forwarded across that broken path, protecting network stability.

Why the distractors are wrong:

• B is incorrect because hardware compatibility checking is handled during the initial StackWise Virtual configuration process, not by LMP.
• C describes the role of the StackWise Virtual Discovery Protocol, which is responsible for discovering the domain and bringing up SVL interfaces.
• D describes the role of the StackWise Virtual Role Resolution Protocol (SVR), which negotiates active/standby switch roles during initialization.

Memory Tip: Think of LMP as a "traffic cop for broken links" - its job is protection, specifically blocking one-way (unidirectional) traffic that could cause forwarding loops or black holes. If you remember "LMP = Link Monitoring and Protection," you'll associate it with rejecting faulty unidirectional forwarding rather than discovery or role assignment.

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