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350-401 Practice Question: Which two statements about PortFast are true?…
Which two statements about PortFast are true? (Choose two.)
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
✓
PortFast allows a port to transition directly from blocking to forwarding state.
PortFast is a Cisco enhancement that allows a port to transition immediately from blocking to forwarding, bypassing the listening and learning states. It is intended for ports connected to end hosts, not to other switches. When PortFast is enabled, the port still participates in STP BPDU processing, but the BPDU guard feature can be used to protect against accidental loops. PortFast does not affect the root bridge election or the designated port selection process.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
PortFast allows a port to transition directly from blocking to forwarding state.
Why this is correct
Correct because PortFast bypasses the listening and learning states, enabling immediate forwarding.
- ✓
PortFast should be enabled on ports that connect to end-user devices.
Why this is correct
Correct because these ports are not expected to participate in STP loops, so fast access is beneficial.
- ✗
PortFast disables BPDU processing on the port.
Why it's wrong here
Incorrect because PortFast does not disable BPDU processing; BPDU guard is a separate feature that can be used to disable the port upon receiving a BPDU.
- ✗
PortFast is automatically enabled on all trunk ports.
Why it's wrong here
Incorrect because trunk ports typically connect to other switches and should not use PortFast; it must be manually configured.
- ✗
PortFast changes the root bridge election process.
Why it's wrong here
Incorrect because PortFast only affects the port state transition, not the STP topology or root election.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.