20+ practice questions focused on Spanning Tree — one of the most tested topics on the CCNA 200-301 v2 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Spanning Tree PracticeWhich TWO switch port configurations are required when connecting a Cisco IP phone and a desktop PC to a single access port?
Explanation: Option B is correct because the 'switchport voice vlan' command assigns a dedicated VLAN for voice traffic, allowing the IP phone to tag its packets with the voice VLAN ID while the PC remains in the native (data) VLAN. Option D is correct because 'mls qos trust cos' preserves the Layer 2 Class of Service (CoS) markings from the IP phone, ensuring voice packets receive appropriate QoS treatment across the network. Option A is incorrect because a trunk port is not required—the access port with the voice VLAN command handles both VLANs without trunking. Option C is incorrect because disabling Spanning Tree Protocol (STP) is not a recommended practice and does not prevent voice delays; STP is essential for loop prevention and can be tuned with PortFast instead. Option E is incorrect because the port must remain a Layer 2 access port, not a routed port, to support both the PC and IP phone.
In a network running STP, SW2 became the root bridge for VLAN 10. Both SW1 and SW2 have the same bridge priority. Why did SW2 become the root?
Explanation: SW2 became the root bridge because its bridge ID is lower. In practical terms, spanning tree elects the root bridge by comparing bridge IDs, which are based on priority plus MAC address. The device with the lowest bridge ID wins. In the exhibit, both switches use the same priority, so the tie is broken by the lower MAC address. This is a classic STP interpretation question. Many learners focus only on priority, but if priorities match, the MAC address becomes decisive.
You are verifying OSPF operation on router R1. After confirming that OSPF is configured on the correct interfaces, which command should you use next to directly check whether R1 has established a neighbor adjacency with another OSPF router?
Explanation: The command show ip ospf neighbor directly displays the OSPF neighbor table, showing whether an adjacency has formed, the neighbor's Router ID, and the current state (e.g., FULL). This is the quickest verification step after confirming configurations. The other commands are unrelated to OSPF: show vlan brief displays VLAN assignments, show spanning-tree shows STP topology, and show mac address-table shows the MAC address table. None of these provide any OSPF neighbor information and would only delay troubleshooting.
Which of the following statements about VLAN configuration and trunking on a Cisco switch are correct? (Choose all that apply.)
Explanation: The native VLAN on a trunk carries untagged traffic, and mismatched native VLANs can cause spanning-tree issues, VLAN hopping, and misdirected control traffic, so both ends must match. VLAN 1 is a system-defined VLAN that cannot be deleted or shut down, making it always available. Dynamic Trunking Protocol (DTP) is a Cisco proprietary protocol that can automatically negotiate trunk links when interfaces are set to desirable or auto. The 'switchport trunk allowed vlan' command prunes VLANs on a trunk, restricting which VLANs are permitted. A trunk link forwards traffic only for VLANs that exist in the local VLAN database, so the statement that it can only carry globally created VLANs is correct. The incorrect option is that an access port can carry multiple VLANs; in reality, an access port is assigned to a single VLAN and cannot carry traffic for multiple VLANs like a trunk.
What problem does Spanning Tree Protocol solve in a switched network?
Explanation: STP prevents Layer 2 loops by blocking redundant paths when necessary, which avoids broadcast storms and MAC table instability.
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Practice all Spanning Tree questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Spanning Tree. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Spanning Tree questions on the 200-301 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Spanning Tree is tested as part of the CCNA 200-301 v2 blueprint. Practicing with targeted Spanning Tree questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but Spanning Tree is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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