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Nokia 4A0-C02 Exam - Topic 9 Question 112 Discussion

Actual exam question for Nokia's 4A0-C02 exam

Question #: 112
Topic #: 9

[All 4A0-C02 Questions]

How is MAC learning achieved in traditional Ethernet switches?

AAs frames leave the switch, the DA is populated into the FDB.

BAs frames enter the switch, the DA is populated into the FDB.

CAs frames leave the switch, the SA is populated into the FDB.

DAs frames enter the switch, the SA is populated into the FDB.

Show Suggested Answer

Suggested Answer: D

by Gail at Jul 04, 2025, 02:33 AM

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Lorrine

6 months ago

Wait, really? I always thought it was the other way around!

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Silva

6 months ago

Nah, it's B for sure. That's how switches learn MACs.

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Cecil

6 months ago

I thought it was C? SA on the way out makes more sense.

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Xuan

6 months ago

Totally agree with B! Makes the most sense in practice.

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Coletta

6 months ago

It's definitely B! DA gets logged as frames come in.

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Eliz

7 months ago

I believe the source address is what gets added to the FDB as frames enter the switch, which makes me think option D is correct.

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Halina

7 months ago

I’m a bit confused. I thought it was the destination address that gets populated, but now I’m not so certain.

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Hortencia

7 months ago

I remember practicing a question like this, and I think it was about the source address being added to the FDB as frames enter the switch. So, maybe D?

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Kanisha

7 months ago

I think MAC learning happens when frames enter the switch, so I’m leaning towards option B, but I’m not entirely sure.

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Martina

7 months ago

I'm feeling confident about this one. The switch learns MAC addresses by adding the destination address (DA) to the FDB as frames leave the switch, not as they enter. So the correct answer is option A.

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Jose

8 months ago

Okay, I remember learning about this in class. The switch learns MAC addresses by populating the FDB with the source address (SA) of frames as they enter the switch. So the correct answer is option D.

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Lorrie

8 months ago

Hmm, I'm a bit confused on this one. I know MAC learning has to do with the switch learning MAC addresses, but I'm not sure if it's the destination address (DA) or source address (SA) that gets added to the FDB. I'll have to think this through carefully.

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Tresa

8 months ago

I'm pretty sure MAC learning is about populating the Forwarding Database (FDB) as frames enter the switch, so I'll go with option B.

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Gene

10 months ago

I think Laurel is right. It makes sense for the DA to be populated as frames enter the switch.

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Laurel

10 months ago

Hmm, I'm not sure about that. I think it's when frames enter the switch.

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Loreta

10 months ago

I believe it's when frames leave the switch, the SA is populated into the FDB.

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Gene

10 months ago

I agree with Laurel, the DA is populated into the FDB as frames enter the switch.

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Laurel

11 months ago

I think MAC learning is achieved when frames enter the switch.

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Julene

11 months ago

I'm going with B. It just makes sense that the switch would learn the destination MAC as the frames come in, not as they go out. How else would it know where to send them?

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Juan

11 months ago

Haha, I bet the answer is B. Otherwise, the switch would be trying to learn the MAC address of frames that have already left the building!

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Estrella

10 months ago

User2: Yeah, that makes sense. It wouldn't make sense to learn MAC addresses of frames that have already left.

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Felicitas

10 months ago

User1: I think the answer is B, as frames enter the switch.

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Jonell

11 months ago

Hmm, I thought it was D. Wouldn't the switch need to learn the source MAC address to build its forwarding table?

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Steffanie

11 months ago

I'm pretty sure it's B. The MAC address of the destination device is learned as frames enter the switch, not as they leave.

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Sabina

11 months ago

User 3: So, the switch learns where to forward frames based on the MAC address of the incoming frames?

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Sherrell

11 months ago

User 2: Yes, that's correct. The destination address is populated into the FDB when frames come in.

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Tora

11 months ago

User 1: I think it's B too. The MAC address is learned as frames enter the switch.

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