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Question 133 of 1,052
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CCNA Practice Question: Which TWO of the following statements about…
This 200-301 practice question tests your understanding of 200-301 exam topics. 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 of the following statements about Spanning Tree Protocol (STP) and Rapid PVST+ are true?
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
✓
The root bridge in STP is elected based on the lowest bridge ID.
STP uses a root bridge election where the switch with the lowest bridge ID (priority + MAC) becomes root. In Rapid PVST+, PortFast is configured on access ports to bypass listening and learning states, and BPDU Guard disables a port upon receiving a BPDU. Option A is correct because the root bridge is indeed determined by the lowest bridge ID. Option D is correct because BPDU Guard error-disables a PortFast-enabled port if a BPDU is received. Option B is false: STP does not use the highest bridge ID; it uses the lowest. Option C is false: PortFast does not disable BPDU Guard; they are separate features. Option E is false: Rapid PVST+ uses the same root election process as STP (lowest bridge ID).
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.
- ✓
The root bridge in STP is elected based on the lowest bridge ID.
Why this is correct
The bridge ID consists of priority and MAC address; the switch with the lowest bridge ID becomes the root bridge.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The root bridge in STP is elected based on the highest bridge ID.
Why it's wrong here
STP uses the lowest bridge ID to elect the root bridge, not the highest.
- ✗
PortFast automatically enables BPDU Guard on an interface.
Why it's wrong here
PortFast and BPDU Guard are independent features; BPDU Guard must be explicitly configured.
- ✓
BPDU Guard places a PortFast-enabled port into an error-disabled state if a BPDU is received.
Why this is correct
BPDU Guard is designed to protect the spanning-tree topology by disabling a port that receives unexpected BPDUs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Rapid PVST+ uses a different root bridge election process than traditional STP.
Why it's wrong here
Both STP and Rapid PVST+ elect the root bridge using the lowest bridge ID.
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.
✓The root bridge in STP is elected based on the lowest bridge ID.Correct answer▾
Why this is correct
The bridge ID consists of priority and MAC address; the switch with the lowest bridge ID becomes the root bridge.
✗The root bridge in STP is elected based on the highest bridge ID.Wrong answer — click to see why▾
Why this is wrong here
This would incorrectly select a switch with a higher priority or MAC address, which contradicts STP standards.
✗PortFast automatically enables BPDU Guard on an interface.Wrong answer — click to see why▾
Why this is wrong here
PortFast only transitions the port to forwarding state quickly; it does not enable BPDU Guard.
✗Rapid PVST+ uses a different root bridge election process than traditional STP.Wrong answer — click to see why▾
Why this is wrong here
The election process is identical; Rapid PVST+ only speeds up convergence, not the election mechanism.
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
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 practitioner preparing for the 200-301 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: The root bridge in STP is elected based on the lowest bridge ID. — STP uses a root bridge election where the switch with the lowest bridge ID (priority + MAC) becomes root. In Rapid PVST+, PortFast is configured on access ports to bypass listening and learning states, and BPDU Guard disables a port upon receiving a BPDU. Option A is correct because the root bridge is indeed determined by the lowest bridge ID. Option D is correct because BPDU Guard error-disables a PortFast-enabled port if a BPDU is received. Option B is false: STP does not use the highest bridge ID; it uses the lowest. Option C is false: PortFast does not disable BPDU Guard; they are separate features. Option E is false: Rapid PVST+ uses the same root election process as STP (lowest bridge ID).
What should I do if I get this 200-301 question wrong?
Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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