20+ practice questions focused on STP — 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 STP 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.
Which three of the following statements about VLAN Trunking Protocol (VTP) are correct? (Choose three.)
Explanation: All three selected statements are correct: VTP pruning reduces unnecessary broadcast traffic by pruning inactive VLANs from trunk links; a VTP server can create/modify/delete VLANs and propagates changes; transparent mode forwards advertisements but does not synchronize. The three distractors are incorrect. D: VTP version 3 is not backward compatible with version 1 and 2; it requires compatible versions. E: A VTP client cannot create local VLANs; it only synchronizes from the server. F: VTP uses multicast MAC address 0100.0CCC.CCCC for advertisements, not 0180.c200.0000 which is used by other protocols like STP.
Which three of the following are valid considerations when configuring EtherChannel? (Choose three.)
Explanation: All three correct statements (A, B, C) are valid considerations when configuring EtherChannel. Option D is incorrect because load balancing can be based on source/destination IP, MAC, or Layer 4 port, not just MAC addresses. Option E is false because although up to 16 interfaces can be in a port channel, only 8 can be active simultaneously (the remaining are in standby). Option F is false because STP operates on the port-channel interface as a whole, not on individual links within the bundle.
A network administrator notices that a switchport in access mode with PortFast enabled has transitioned to an err-disabled state. What is the most likely cause?
Explanation: The strongest reason is a BPDU Guard violation on a PortFast-enabled access port. In practical terms, the port was expected to face an end host, not a switching device that emits BPDUs. When BPDUs appeared, the switch treated that as a topology-policy violation and error-disabled the interface to protect the network. This is one of the most classic access-layer protection patterns on the CCNA exam.
A switch is configured with DHCP snooping and Dynamic ARP Inspection. Hosts suddenly lose connectivity after changing IP settings manually. Which explanation is strongest?
Explanation: The correct answer is A because DAI uses DHCP snooping binding to validate ARP messages; a manual IP change creates a mismatch, causing DAI to block ARP. Option B is incorrect because STP prevents loops and does not block based on MAC address changes. Option C is incorrect because OSPF authentication is a routing protocol feature irrelevant on an access port. Option D is incorrect because PPP authentication applies to serial links, not Ethernet ARP.
+15 more STP questions available
Practice all STP questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of STP. 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
STP 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. STP is tested as part of the CCNA 200-301 v2 blueprint. Practicing with targeted STP questions ensures you can handle any format or difficulty that appears.
Yes. Courseiva provides free 200-301 practice questions across all exam topics and domains. The platform includes topic-based practice, mock exams, missed-question review, bookmarked questions, and readiness tracking — no account required.
Difficulty is subjective, but STP 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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