hardMultiple ChoiceObjective-mapped
200-901 Practice Question: During a network migration, an engineer needs to…
During a network migration, an engineer needs to replace a legacy core switch with a new one without disrupting the existing STP topology. The new switch supports RSTP and will be connected via two trunk links. Which configuration should be applied to the new switch to prevent it from becoming the root bridge?
⚠ Common exam trap
A common mix-up: candidates confuse root guard (which protects against becoming a root port) with preventing the switch from becoming the root bridge, or they mistakenly think setting priority to 0 (lowest) would prevent root election, when in fact it forces the switch to become root.
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
✓
Configure the bridge priority to 61440
Setting the bridge priority to 61440 (which is a valid priority value in increments of 4096) ensures the new switch has a higher numerical priority than the current root bridge, preventing it from becoming the root. In STP/RSTP, the switch with the lowest bridge priority becomes the root bridge; by configuring a high priority, the new switch will not disrupt the existing topology.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable root guard on the trunk ports
Why it's wrong here
Root guard protects against inferior BPDUs, does not prevent this switch from becoming root.
- ✓
Configure the bridge priority to 61440
Why this is correct
High priority makes it less likely to become root.
- ✗
Enable BPDU guard on the trunk ports
Why it's wrong here
BPDU guard disables ports if BPDU received, not related to root election.
- ✗
Set the bridge priority to 0
Why it's wrong here
Priority 0 makes it the root.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-901 exam.