CompTIA CNX-001 Exam - Topic 3 Question 12 Discussion

Actual exam question for CompTIA's CNX-001 exam

Question #: 12
Topic #: 3

A network engineer is designing a Layer 2 deployment for a company that occupies several floors in an office building. The engineer decides to make each floor its own VLAN but still allow for communication between all user VLANs. The engineer also wants to reduce the time necessary for STP convergence to occur when new switches come online. Which of the following should the engineer enable to accomplish this goal?

ABPDU Guard

BPriority

CTagging

DPortfast

Show Suggested Answer

Suggested Answer: D

Enabling PortFast on access ports lets them immediately enter the forwarding state, skipping the STP listening/learning timers, and dramatically speeds up convergence when switches or end-stations come online.

by Dominque at Nov 25, 2025, 02:47 AM

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Magdalene

15 hours ago

Definitely go with Portfast for faster STP convergence.

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Amie

6 days ago

Haha, Portfast all the way! I'd be tempted to just unplug the STP cables and call it a day.

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Bok

11 days ago

D) Portfast is the way to go. Ain't nobody got time for slow STP convergence!

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Cecilia

16 days ago

I'm going with D. Portfast is the obvious choice here. Who wants to wait around for STP to do its thing?

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Louvenia

21 days ago

Definitely D. Portfast is the way to go for this scenario. Gotta get that STP convergence happening fast!

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Willard

26 days ago

D) Portfast is the correct answer. It reduces the time for STP convergence when new switches come online.

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Gail

1 month ago

I’m a bit confused about tagging; I thought it was more related to VLAN identification rather than convergence times.

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Alesia

1 month ago

I practiced a similar question where we had to choose between STP features, and I think Portfast was the right answer there too.

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Gracie

1 month ago

I’m not entirely sure, but I feel like BPDU Guard is more about protecting the network from loops rather than speeding up convergence.

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Tom

2 months ago

Portfast is definitely the way to go here. It'll get those new switches up and running quickly without waiting for STP.

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Rosio

2 months ago

Priority seems like it could be a good choice to help with the STP convergence, but I'm not totally confident in that.

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Gregoria

2 months ago

I'm leaning towards Tagging as the way to allow communication between the user VLANs on each floor.

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Kayleigh

3 months ago

Tagging is cool, but it won't help with convergence time.

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Serita

3 months ago

I remember studying STP convergence times, and I think enabling Portfast could help with that, especially for access ports.

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Carmen

3 months ago

Hmm, I'm not sure about that. Wouldn't BPDU Guard be a better option to prevent issues with new switches?

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Roselle

3 months ago

I think the engineer should enable Portfast to reduce the time for STP convergence when new switches come online.

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Fletcher

2 months ago

Portfast is the way to go for reducing downtime.

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Vallie

2 months ago

Definitely! It speeds up the process when new switches are added.

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Cecily

2 months ago

I agree, enabling Portfast makes sense for quicker STP convergence.

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