- A
Rapid PVST+ runs a separate instance of RSTP for each VLAN.
Rapid PVST+ is a per-VLAN implementation of RSTP (802.1w). Each VLAN runs its own RSTP instance, allowing independent root bridge election and port roles per VLAN. This enables load balancing across VLANs.
- B
Rapid PVST+ is an enhancement of PVST+ and uses the same timer-based convergence as standard 802.1D.
Why wrong: Rapid PVST+ is based on RSTP (802.1w), which uses a proposal/agreement handshake for fast convergence, not the timer-based convergence of 802.1D. PVST+ uses 802.1D timers.
- C
Rapid PVST+ uses the 802.1D standard to compute the spanning tree for each VLAN.
Why wrong: Rapid PVST+ uses 802.1w (RSTP), not 802.1D. 802.1D is the original STP standard, which is slower and uses different port states and convergence mechanisms.
- D
PortFast and BPDU Guard are commonly configured on access ports to prevent loops and speed up convergence.
PortFast allows an access port to transition directly to forwarding state, bypassing listening and learning. BPDU Guard disables the port if a BPDU is received, protecting against accidental loops from misconfigured devices. Together, they secure edge ports.
- E
Rapid PVST+ uses the 802.1Q trunking protocol to reduce the number of spanning-tree instances.
Why wrong: Rapid PVST+ does not reduce the number of STP instances; it actually maintains per-VLAN instances. 802.1Q is a trunking protocol, but it does not affect the number of STP instances. Rapid PVST+ runs one instance per VLAN regardless of trunking method.
Quick Answer
The correct answer is that PortFast and BPDU Guard are commonly configured on access ports to prevent loops and speed up convergence. This is because Rapid PVST+ runs a separate instance of RSTP (802.1w) for each VLAN, allowing per-VLAN rapid convergence and load balancing; PortFast lets an access port skip the listening and learning states to enter forwarding immediately, while BPDU Guard protects the network by error-disabling any access port that unexpectedly receives a BPDU, thus preventing accidental loops. On the CCNA 200-301 v2 exam, this question tests your understanding of how Rapid PVST+ behavior differs from classic 802.1D STP—specifically that it uses RSTP’s handshake mechanism, not timer-based convergence, and that it does not reduce instances via 802.1Q. A common trap is confusing Rapid PVST+ with PVST+ (which uses 802.1D) or assuming it relies on timers. Memory tip: think “PortFast for speed, BPDU Guard for safety” on access ports.
CCNA Switching and Network Access Practice Question
This 200-301 practice question tests your understanding of switching and network access. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO statements correctly describe the behavior of Rapid PVST+ in a Layer 2 network?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Rapid PVST+ runs a separate instance of RSTP for each VLAN.
Rapid PVST+ runs a separate instance of RSTP (802.1w) for each VLAN, enabling per-VLAN rapid convergence and load balancing. Option D is correct because PortFast allows access ports to transition to forwarding immediately, while BPDU Guard prevents loops by disabling a port that receives a BPDU. Option B is incorrect because Rapid PVST+ uses RSTP's handshake mechanism, not timer-based convergence like 802.1D. Option C is wrong: Rapid PVST+ is based on 802.1w, not 802.1D. Option E is false because Rapid PVST+ does not use 802.1Q to reduce instances; it maintains a separate spanning-tree instance per VLAN.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Rapid PVST+ runs a separate instance of RSTP for each VLAN.
Why this is correct
Rapid PVST+ is a per-VLAN implementation of RSTP (802.1w). Each VLAN runs its own RSTP instance, allowing independent root bridge election and port roles per VLAN. This enables load balancing across VLANs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Rapid PVST+ is an enhancement of PVST+ and uses the same timer-based convergence as standard 802.1D.
Why it's wrong here
Rapid PVST+ is based on RSTP (802.1w), which uses a proposal/agreement handshake for fast convergence, not the timer-based convergence of 802.1D. PVST+ uses 802.1D timers.
- ✗
Rapid PVST+ uses the 802.1D standard to compute the spanning tree for each VLAN.
- ✓
PortFast and BPDU Guard are commonly configured on access ports to prevent loops and speed up convergence.
Why this is correct
PortFast allows an access port to transition directly to forwarding state, bypassing listening and learning. BPDU Guard disables the port if a BPDU is received, protecting against accidental loops from misconfigured devices. Together, they secure edge ports.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Rapid PVST+ uses the 802.1Q trunking protocol to reduce the number of spanning-tree instances.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Rapid PVST+ runs a separate instance of RSTP for each VLAN.Correct answer▾
Why this is correct
Rapid PVST+ is a per-VLAN implementation of RSTP (802.1w). Each VLAN runs its own RSTP instance, allowing independent root bridge election and port roles per VLAN. This enables load balancing across VLANs.
✗Rapid PVST+ is an enhancement of PVST+ and uses the same timer-based convergence as standard 802.1D.Wrong answer — click to see why▾
Why this is wrong here
Rapid PVST+ is based on RSTP (802.1w), which uses a proposal/agreement handshake for fast convergence, not the timer-based convergence of 802.1D. PVST+ uses 802.1D timers, but Rapid PVST+ does not.
Why candidates choose this
Students may confuse Rapid PVST+ with PVST+, assuming both use the same convergence mechanism, or they may think that 'Rapid' only implies faster timers rather than a fundamentally different protocol.
✗Rapid PVST+ uses the 802.1D standard to compute the spanning tree for each VLAN.Wrong answer — click to see why▾
Why this is wrong here
Rapid PVST+ uses 802.1w (RSTP) for spanning tree computation, not 802.1D. 802.1D is the original STP standard with slower convergence and different port states.
Why candidates choose this
Since Rapid PVST+ is a per-VLAN implementation, some may incorrectly assume it still uses the older 802.1D standard, especially if they are not familiar with RSTP enhancements.
✗Rapid PVST+ uses the 802.1Q trunking protocol to reduce the number of spanning-tree instances.Wrong answer — click to see why▾
Why this is wrong here
Rapid PVST+ does not reduce the number of spanning-tree instances; it maintains one instance per VLAN. 802.1Q is a trunking protocol that does not affect the number of STP instances. Rapid PVST+ runs per-VLAN instances regardless of trunking method.
Why candidates choose this
Some may think that using 802.1Q trunking reduces STP instances because it is associated with VLAN tagging, but Rapid PVST+ actually increases instances compared to MSTP, which can group VLANs.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between PVST+ (802.1D-based) and Rapid PVST+ (802.1w-based), and the trap here is assuming Rapid PVST+ still relies on timer-based convergence like standard 802.1D, when in fact it uses the faster RSTP handshake mechanism.
Detailed technical explanation
How to think about this question
Rapid PVST+ leverages RSTP's proposal-agreement handshake to achieve convergence in under a second, typically 1-3 seconds, compared to 30-50 seconds for 802.1D. It also supports PortFast and BPDU Guard on access ports to immediately transition ports to forwarding and protect against rogue switch connections, which is critical in modern campus networks with end hosts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Switching and Network Access — This question tests Switching and Network Access — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Rapid PVST+ runs a separate instance of RSTP for each VLAN. — Rapid PVST+ runs a separate instance of RSTP (802.1w) for each VLAN, enabling per-VLAN rapid convergence and load balancing. Option D is correct because PortFast allows access ports to transition to forwarding immediately, while BPDU Guard prevents loops by disabling a port that receives a BPDU. Option B is incorrect because Rapid PVST+ uses RSTP's handshake mechanism, not timer-based convergence like 802.1D. Option C is wrong: Rapid PVST+ is based on 802.1w, not 802.1D. Option E is false because Rapid PVST+ does not use 802.1Q to reduce instances; it maintains a separate spanning-tree instance per VLAN.
What should I do if I get this 200-301 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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