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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Gerald

1 month ago

I feel like Portfast is essential for our VLAN setup.

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Shawnna

1 month ago

C) Tagging is important too, but not for STP convergence.

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Harrison

1 month ago

True, but it doesn't help with convergence time like Portfast.

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Raul

2 months ago

But what about A) BPDU Guard? It protects against loops.

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Lili

2 months ago

Agreed! Portfast helps with quick switch connections.

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Chantell

2 months ago

I think D) Portfast is the best choice. It speeds up STP.

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Fletcher

2 months ago

I thought STP was supposed to be slow, how can it be fast?

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Jacklyn

2 months ago

Wait, isn't BPDU Guard more important for security?

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Gilma

2 months ago

I agree, Portfast is the way to go!

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Magdalene

3 months ago

Definitely go with Portfast for faster STP convergence.

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Amie

3 months 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

3 months ago

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

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Cecilia

4 months 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

4 months ago

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

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Willard

4 months ago

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

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Gail

4 months 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

4 months 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

4 months 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

5 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

5 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

5 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

6 months ago

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

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Serita

6 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

6 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

6 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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Keshia

21 days ago

Portfast is essential in a multi-floor setup like that.

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Wilford

26 days ago

Good point! It helps with VLAN communication too.

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Fletcher

5 months ago

Portfast is the way to go for reducing downtime.

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Vallie

5 months ago

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

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Cecily

5 months ago

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

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