Spanning Tree Protocol — Cisco CCNA (200-301) Practice Questions
Spanning Tree Protocol (STP, IEEE 802.1D) prevents layer 2 loops in switched networks by placing redundant switch ports into a blocking state, ensuring only one active path exists between any two network segments at a time. STP elects a root bridge based on bridge ID (priority plus MAC address) and then determines root ports and designated ports to build a loop-free topology. The CCNA exam tests STP extensively, covering the election process, port states (blocking, listening, learning, forwarding, disabled), and how STP reacts to topology changes. Candidates must understand STP because loops at layer 2 can cause broadcast storms that bring an entire network down.
Free questions on spanning tree protocol
Which spanning tree protocol is the IEEE standard that replaced the original Cisco proprietary version?
Free question · medium · full answer + explanation
What is the default priority value for a Spanning Tree Bridge ID?
Free question · easy · full answer + explanation
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