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Cisco 300-515 Exam - Topic 5 Question 52 Discussion

How does Layer 3 VPN traffic traverse an ISP network?
C) Devices on the network use MPLS labels to move VPN traffic through the network.
A) Devices on the network use MPLS labels to share VPN routes between P routers in the network.
B) Devices on the network use LSAs to share routes between P routers in the network.
D) Devices on the network use GRE tunnels to move traffic between VRFs.

Cisco 300-515 Exam - Topic 5 Question 52 Discussion

Actual exam question for Cisco's 300-515 exam
Question #: 52
Topic #: 5
[All 300-515 Questions]

How does Layer 3 VPN traffic traverse an ISP network?

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Suggested Answer: C

by Deeanna at Jul 25, 2022, 01:55 AM

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Mendy
10 months ago
I had no idea MPLS was so crucial for VPNs!
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Alisha
10 months ago
LSAs? That's not how it works, B is wrong.
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Carolynn
10 months ago
Wait, are GRE tunnels not used for this?
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Loise
11 months ago
Totally agree, C is the right answer.
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Deandrea
11 months ago
MPLS labels are key for Layer 3 VPNs!
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Rhea
11 months ago
GRE tunnels seem more related to connecting different VRFs, but I don't recall them being the primary method for Layer 3 VPN traffic in an ISP network.
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Catarina
11 months ago
I have a vague memory of LSAs being used in OSPF, but I'm not confident they relate to Layer 3 VPNs. I might be mixing things up.
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Beata
11 months ago
I remember practicing a question similar to this, and I think option C sounds right because it mentions moving VPN traffic, which is what we learned about MPLS.
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Olen
11 months ago
I think MPLS labels are definitely involved in how Layer 3 VPN traffic moves, but I'm not sure if it's just about sharing routes or actually moving the traffic.
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German
11 months ago
I'm pretty confident I know the answer to this one. The Cisco Cyber Vision sensor runs on IOx, so it would support the IE9300 Series and the IE3400 and IE3300-10G switches.
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Marsha
11 months ago
This looks like a tricky state machine question. I'll need to carefully read through the requirements and compare them to the diagrams.
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Janey
11 months ago
I remember a question similar to this that discussed the balance between management and employee autonomy. I feel like B could be a trap answer too.
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