Juniper JN0-363 Exam - Topic 4 Question 51 Discussion

Actual exam question for Juniper's JN0-363 exam

Question #: 51
Topic #: 4

How does a Junos device learn about MAC addresses when II is first connected to an Ethernet LAN?

AThe device sends out a network broadcast message asking tor all devices and MAC addresses on the network and stores this information In addition lo the interface from which the response was received.

BThe device learns the destination MAC addresses from traffic in the network and stores this MAC address in addition to the interface from which the traffic was received.

CThe device learns the source MAC addresses from traffic in the network and stores this MAC address in addition to the interface from which the traffic was received.

DThe device sends out a network multicast message asking for all devices and MAC addresses on the network and stores this Information in addition to the interface from which the response was received.

Show Suggested Answer

Suggested Answer: B, D

static route with a next-hop of next-table pointing to the appropriate routing table which contains more accurate information rib-groups to mirror routing information from one route-table to another. However, in many cases, in order to make this work, interface-routes also need to be mirrored. RIB Group policy can be used to constrain the routing information instance-import and instance-export statements configured within the individual routing-instances to leak routes from one table to another. Again, policy can be used here to constrain the routing information. This method is more straightforward than the rib-group method A final approach is to use physical interfaces or logical-tunnels to stitch routing-instances and use a routing protocol or static routes across this connection between the two routing-instances.

by Ciara at Jan 24, 2025, 12:27 AM

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Gerardo

3 months ago

Nah, I think it's B. Destination MACs are important too!

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Shad

3 months ago

I thought it was A at first, but C makes more sense.

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Serina

3 months ago

Wait, so it doesn't actually broadcast for all MACs? That's surprising!

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Amie

4 months ago

Totally agree, option C is the correct one!

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Georgiann

4 months ago

The device learns source MAC addresses from traffic, not destination.

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Tony

4 months ago

I'm leaning towards option B, since it mentions learning from traffic, but I wonder if there's a specific scenario where option C could be correct too.

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Brice

4 months ago

I feel like the answer might involve sending out a broadcast message, but I can't recall if it's multicast or just a regular broadcast.

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Irene

4 months ago

I remember practicing a question like this, and I think it was about how devices learn MAC addresses through received traffic.

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Junita

5 months ago

I think the device learns MAC addresses from traffic, but I'm not sure if it's destination or source MAC addresses.

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Edda

5 months ago

This is a good one. I remember learning about this in class. The device sends out a broadcast message to discover all the devices and MAC addresses on the network, and stores that info. So I'm pretty confident the answer is A.

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Sherita

5 months ago

I'm a bit confused by this question. Is it asking about how the device learns MAC addresses in general, or specifically when it's first connected to the LAN? I want to make sure I understand the context before I choose an answer.

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Kiley

5 months ago

Okay, I've got this. The device learns the source MAC addresses from the traffic it receives on the interface, and stores that information. So the correct answer is option C.

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Derrick

5 months ago

Hmm, I'm a little unsure about this one. I know Junos devices learn MAC addresses, but I can't quite remember the exact process. I'll have to think through the options carefully and see which one best matches the details in the question.

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Burma

5 months ago

This seems like a pretty straightforward question about how Junos devices learn MAC addresses. I think the key is to focus on the specific details of the question, like the fact that it's talking about when the device is first connected to the Ethernet LAN.

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Jerrod

9 months ago

Option C makes the most sense. The Junos device isn't going to waste its time with broadcasts or multicasts, it's going to learn those MAC addresses the old-fashioned way: by eavesdropping on the network traffic. That's how the cool kids do it these days.

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Gladys

9 months ago

Hey, I heard the Junos device has a secret handshake it does with all the other devices on the network to learn their MAC addresses. No, just kidding, C is the right answer. It's all about that traffic, baby!

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Kristel

8 months ago

C) The device learns the source MAC addresses from traffic in the network and stores this MAC address in addition to the interface from which the traffic was received.

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Barrett

8 months ago

B) The device learns the destination MAC addresses from traffic in the network and stores this MAC address in addition to the interface from which the traffic was received.

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Naomi

8 months ago

Haha, no secret handshake needed!

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Charolette

8 months ago

C) The device learns the source MAC addresses from traffic in the network and stores this MAC address in addition to the interface from which the traffic was received.

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Evette

9 months ago

That's right! It's all about that traffic.

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Cordelia

9 months ago

A) The device sends out a network broadcast message asking for all devices and MAC addresses on the network and stores this information in addition to the interface from which the response was received.

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Emerson

9 months ago

C) The device learns the source MAC addresses from traffic in the network and stores this MAC address in addition to the interface from which the traffic was received.

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Sanda

10 months ago

Aha! C is the way to go. The Junos device is a smart cookie, it knows how to learn those MAC addresses from the traffic it sees. No need for any fancy broadcasts or multicasts.

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Miesha

8 months ago

That's true, the Junos device can save time and resources by simply learning from the network traffic.

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Polly

9 months ago

Definitely, it's smart to just learn from the traffic instead of sending out broadcast or multicast messages.

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Valentin

9 months ago

I agree, option C seems like the most efficient way for the Junos device to learn MAC addresses.

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Junita

10 months ago

I'm not sure about this one. Maybe B or C could be the right answer, but I'm leaning more towards C. The device definitely learns from the traffic it observes.

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Delmy

10 months ago

Option C seems like the correct answer. The Junos device learns the source MAC addresses from the traffic it receives and stores them along with the interface information.

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