What criteria is used first during the root port selection process?

The correct answer is B. lowest path cost to the root bridge. Root Port selection is based on the port having lowest cost to the Root Bridge (CAT1). For PVST (Per VLAN Spanning Tree) path cost will depend on bandwidth of links and cost value is as shown below for most commonly used links. https://mrncciew.com/2013/07/07/stp-root-port-select

Submitted by daniela_cl· Mar 5, 2026Network Access

Question

What criteria is used first during the root port selection process?

Options

Alocal port ID
Blowest path cost to the root bridge
Clowest neighbor's bridge ID
Dlowest neighbor's port ID

How the community answered

(27 responses)

A
4% (1)
B
93% (25)
D
4% (1)

Explanation

Root Port selection is based on the port having lowest cost to the Root Bridge (CAT1). For PVST (Per VLAN Spanning Tree) path cost will depend on bandwidth of links and cost value is as shown below for most commonly used links. https://mrncciew.com/2013/07/07/stp-root-port-selection/

Topics

#root port selection#path cost#spanning tree#STP tiebreakers

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