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Exam 300-410 topic 1 question 101 discussion

Actual exam question from Cisco's 300-410
Question #: 101
Topic #: 1
[All 300-410 Questions]

How does an MPLS Layer 3 VPN function?

  • A. multiple customer sites interconnect through service provider network to create secure tunnels between customer edge devices
  • B. multiple customer sites interconnect through a service provider network using customer edge to provider edge connectivity
  • C. set of sites interconnect privately over the Internet for security
  • D. set of sites use multiprotocol BGP at the customer site for aggregation
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Suggested Answer: B 🗳️
by gndrx78 at Jan. 12, 2022, 4:05 p.m.

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gndrx78
Highly Voted 3 years, 4 months ago
Given answer is ok. Reference: https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-5/lxvpn/configuration/guide/b-l3vpn-cg-asr9000-65x/b-l3vpn-cg-asr9000-65x_chapter_010.pdf
upvoted 10 times
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HungarianDish_111
Highly Voted 1 year, 11 months ago
Selected Answer: B
Customer edge simply provides edge connectivity for the customer site. CE is not part of the provider mpls network (LSP). https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2020/pdf/DGTL-BRKMPL-1100.pdf
upvoted 7 times
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[Removed]
Most Recent 10 months ago
Selected Answer: B
B is correct
upvoted 1 times
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MasoudGhorbani
1 year, 6 months ago
B is the right answer because MPLS traffic is already going through secure ISP routers, not the internet. The main focus in MPLS is on segregating routes.
upvoted 1 times
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JeffJeffson
1 year, 10 months ago
Selected Answer: B
Connectivity is between CE and PE in a provider environment.
upvoted 3 times
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MicMillon
1 year, 10 months ago
Selected Answer: B
MPLS tunnels the routes through the providers core, but doesn't extend that tunnel to the edge device
upvoted 3 times
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Malasxd
2 years ago
I think it's "A". MPLS Layer 3 VPN is not secure. We don't configure any mechanism to make the tunnel secure like a ipsec for exemple. And I've never seen documentation mentioning the word "security" for this type of tunnel.
upvoted 1 times
Malasxd
1 year, 12 months ago
I meant "B"
upvoted 3 times
bk989
11 months ago
MPLS is not inherently secure with native tunnel protection; it offers traffic segmentation and private channels, so it does offer a form of security, in the context of the question though there are no secure tunnels
upvoted 1 times
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6dd4aa0
2 years, 1 month ago
Selected Answer: A
Referring to Figure 18-11 in Page 740 of the CCNP Enterprise Advanced Routing ENARSI Official Guide, it shows that multiple CE routers are connected to a single PE as an ingress router. A VPN tunnel is formed from the ingress routers to a series of P (provider) routers to the egress PE routers before exiting the respective customer's site. Hence, the answer I will take is A
upvoted 3 times
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C (25%)
B (20%)
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