20. STP (Part 1) Exam questions and answers Graded A+ 2026/2027 edition If looped Layer 2 broadcast messages accumulate and congest a network, this is called a [...] -broadcast storm When a switch rapidly and continuously updates a MAC address in its

20. STP (Part 1) Exam questions
and answers Graded A+
2026/2027 edition
If looped Layer 2 broadcast messages accumulate and congest a
network, this is called a [...] - ✅✅broadcast storm


When a switch rapidly and continuously updates a MAC address in its
MAC address table, alternating between different interfaces, this is
known as [...] - ✅✅MAC address flapping


'Classic' Spanning Tree Protocol is IEEE [...] - ✅✅802.1D


Do all switches run STP by default? - ✅✅Yes


The messages sent by STP switches are called: - ✅✅BPDUs (Bridge
Protocol Data Units)


What does BPDU stand for? - ✅✅Bridge Protocol Data Unit


How many root bridges are elected in STP? - ✅✅One

, Which field in the STP BPDU is used to elect the root bridge? -
✅✅Bridge ID field


STP: The switch with the lowest [...] becomes the root bridge. -
✅✅Bridge ID


STP: All ports on the root bridge are [...] ports (forwarding state) -
✅✅designated


STP: The default bridge priority is [...] (not including Extended System
ID) - ✅✅32768


Three fields of the STP Bridge ID: [...] (4 bits) Extended System ID (12
bits) MAC Address (48 bits) - ✅✅Bridge Priority


Three fields of the STP Bridge ID: Bridge Priority (4 bits) [...] (12 bits)
MAC Address (48 bits) - ✅✅Extended System ID (VLAN ID)


Three fields of the STP Bridge ID: Bridge Priority (4 bits) Extended
System ID (12 bits) [...] (48 bits) - ✅✅MAC Address


Three fields of the STP Bridge ID: Bridge Priority ([...] bits) Extended
System ID (12 bits) MAC Address (48 bits) - ✅✅4