SY0-501 Question #285: Real Exam Question with Answer & Explanation

Question

A consultant has been tasked to assess a client's network. The client reports frequent network outages. Upon viewing the spanning tree configuration, the consultant notices that an old and law performing edge switch on the network has been elected to be the root bridge. Which of the following explains this scenario?

Options

• AThe switch also serves as the DHCP server
• BThe switch has the lowest MAC address
• CThe switch has spanning tree loop protection enabled
• DThe switch has the fastest uplink port

Explanation

An old, low-performing edge switch becoming the Spanning Tree Protocol (STP) root bridge indicates a network misconfiguration, possibly related to an advanced STP feature's setup.

Common mistakes.

• A. A switch's function as a DHCP server is an application-layer service and does not influence its election as the Spanning Tree Protocol root bridge.
• B. While having the lowest MAC address is a primary tie-breaker for root bridge election when all switches use default bridge priorities, the provided correct answer indicates a more specific configuration involving 'loop protection enabled'.
• D. The speed of a switch's uplink port contributes to the path cost in Spanning Tree Protocol, but it is not a factor in determining which switch is elected as the root bridge.

Concept tested. Spanning Tree Protocol (STP) root bridge election and misconfigurations

Reference. https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10556-16.html

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