Juniper JN0-105 Exam - Topic 2 Question 31 Discussion

Actual exam question for Juniper's JN0-105 exam

Question #: 31
Topic #: 2

Which two statements are correct about MAC addresses? (Choose two.)

ASwitches use the Address Resolution Protocol table to assign MAC addresses to network interface cards in the forwarding frame.

BThe source and destination MAC addresses always remains static to the final destination.

CThe MAC address identifies the physical hardware.

DSwitches use the destination MAC address to identify the next-hop destination and to change the destination MAC address in the frame.

Show Suggested Answer

Suggested Answer: C, D

MAC (Media Access Control) addresses are unique identifiers assigned to network interfaces for communications at the data link layer of a network segment. MAC addresses are used to identify the physical hardware on a network. In the context of Ethernet switches, the destination MAC address in incoming frames is used to determine the appropriate output port for forwarding the frame towards its final destination. The switch does not change the destination MAC address; it uses the MAC address to make forwarding decisions within the local network segment.

by Bernardine at Feb 08, 2025, 12:19 PM

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Luisa

3 months ago

I thought MAC addresses could change, isn't that a thing?

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Felicitas

3 months ago

D is correct too, switches do use destination MACs!

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Ty

3 months ago

Wait, are we sure about B? That sounds off.

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Linwood

4 months ago

Totally agree, option C is spot on!

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Brice

4 months ago

The MAC address identifies the physical hardware.

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Cassandra

4 months ago

I feel like B is tricky; I know MAC addresses can change in some cases, like when a device is virtualized.

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Elroy

4 months ago

I practiced a question similar to this, and I think D makes sense because switches do use destination MAC addresses for forwarding.

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Vilma

4 months ago

I'm not sure about A; I thought switches used their own MAC address tables rather than ARP for that.

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Denna

5 months ago

I remember that MAC addresses are tied to hardware, so I think option C is definitely correct.

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Zachary

5 months ago

Ah, this is a good one. I remember learning about MAC addresses and how they work with switches. I'm pretty sure option C is correct, as MAC addresses do identify the physical hardware. And option D also sounds right, as switches use the destination MAC address to forward frames. I'll go with those two.

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Gianna

5 months ago

Okay, let me think this through. I know MAC addresses are unique identifiers for network interfaces, so option C is correct. As for the other options, I'm a bit uncertain. I think option D might be correct, but I'm not 100% sure about the details of how switches use MAC addresses. I'll make an educated guess and select that one as well.

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Merlyn

5 months ago

Hmm, this is a tricky one. I'm not entirely sure about the details of how switches use MAC addresses. I think option C is correct, but I'm a bit unsure about the other options. I'll need to review my notes on MAC addresses and switching before I can confidently answer this.

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Lacey

5 months ago

I'm pretty confident about this one. I know MAC addresses are used to identify physical network devices, so option C is definitely correct. I'm also pretty sure switches use the destination MAC address to forward frames, so option D is likely correct as well.

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Tanesha

12 months ago

Switches are like the traffic cops of the network, directing those MAC address frames to their proper destinations!

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Nida

11 months ago

C) The MAC address identifies the physical hardware.

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Louis

11 months ago

A) Switches use the Address Resolution Protocol table to assign MAC addresses to network interface cards in the forwarding frame.

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Jesusita

12 months ago

Hmm, I'm not sure about D. Doesn't the switch just look at the destination MAC and forward accordingly?

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Beatriz

12 months ago

I think A and D are the right answers. Switches use the MAC address table to forward frames to the correct destination.

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Brandon

12 months ago

B is wrong. The source and destination MAC addresses can change at each hop in the network.

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Crista

11 months ago

C) The MAC address identifies the physical hardware.

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Eden

11 months ago

C) The MAC address identifies the physical hardware.

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Merissa

12 months ago

A) Switches use the Address Resolution Protocol table to assign MAC addresses to network interface cards in the forwarding frame.

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Marshall

12 months ago

A) Switches use the Address Resolution Protocol table to assign MAC addresses to network interface cards in the forwarding frame.

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Arlyne

1 year ago

I'm not sure about statement B, though. The source and destination MAC addresses can change as the frame is forwarded, right?

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Beata

1 year ago

I agree with you, Mike. I also believe that statement D is correct because switches use the destination MAC address to identify the next-hop destination.

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