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How is MAC learning achieved in traditional Ethernet switches?
Suggested Answer: D
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27 comments · newest first
LO
Lorrine
10 months ago
Wait, really? I always thought it was the other way around!
SI
Silva
10 months ago
Nah, it's B for sure. That's how switches learn MACs.
CE
Cecil
11 months ago
I thought it was C? SA on the way out makes more sense.
XU
Xuan
11 months ago
Totally agree with B! Makes the most sense in practice.
CO
Coletta
11 months ago
It's definitely B! DA gets logged as frames come in.
EL
Eliz
11 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.
HA
Halina
11 months ago
I’m a bit confused. I thought it was the destination address that gets populated, but now I’m not so certain.
HO
Hortencia
12 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?
KA
Kanisha
12 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.
MA
Martina
1 year 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.
JO
Jose
1 year 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.
LO
Lorrie
1 year 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.
TR
Tresa
1 year 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.
GE
Gene
1 year ago
I think Laurel is right. It makes sense for the DA to be populated as frames enter the switch.
LA
Laurel
1 year ago
Hmm, I'm not sure about that. I think it's when frames enter the switch.
LO
Loreta
1 year ago
I believe it's when frames leave the switch, the SA is populated into the FDB.
GE
Gene
1 year ago
I agree with Laurel, the DA is populated into the FDB as frames enter the switch.
LA
Laurel
1 year ago
I think MAC learning is achieved when frames enter the switch.
JU
Julene
1 year 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?
JU
Juan
1 year 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!
ES
Estrella
1 year ago
User2: Yeah, that makes sense. It wouldn't make sense to learn MAC addresses of frames that have already left.
FE
Felicitas
1 year ago
User1: I think the answer is B, as frames enter the switch.
JO
Jonell
1 year ago
Hmm, I thought it was D. Wouldn't the switch need to learn the source MAC address to build its forwarding table?
ST
Steffanie
1 year 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.
SA
Sabina
1 year ago
User 3: So, the switch learns where to forward frames based on the MAC address of the incoming frames?
SH
Sherrell
1 year ago
User 2: Yes, that's correct. The destination address is populated into the FDB when frames come in.
TO
Tora
1 year ago
User 1: I think it's B too. The MAC address is learned as frames enter the switch.