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Exam 400-007 topic 1 question 246 discussion

Actual exam question from Cisco's 400-007
Question #: 246
Topic #: 1
[All 400-007 Questions]

A software-defined networking (SDN) controller learns network topology information by using BGP link-state sessions with the route reflectors of an MPLS-enabled network. The controller then uses the topology information to apply on-demand traffic policies to the network through a protocol that is supported from all Layer 3 routers. Each policy is represented as a RIB entry in the control plane of the router. Which SDN model has been implemented?

  • A. SDN centralized
  • B. SDN traffic engineering
  • C. SD-WAN
  • D. SDN hybrid
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Suggested Answer: D 🗳️
by cisco_guy at June 3, 2024, 4:46 a.m.

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cisco_guy
Highly Voted 11 months, 1 week ago
Selected Answer: B
What is being described is SR-TE with ODN. https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r7-9/segment-routing/configuration/guide/b-segment-routing-cg-asr9000-79x/configure-sr-te-policies.html#:~:text=Segment%20Routing%20On%2DDemand%20Next,required%20(on%2Ddemand).
upvoted 6 times
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sandccie
Most Recent 2 months ago
Selected Answer: D
D. SDN TE is not a SDN model - its a use case.
upvoted 2 times
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kalulosu
3 months, 2 weeks ago
Selected Answer: B
I think ans is B. It falls under the traffic engineering model of SDN, where the SDN controller leverages network topology information to apply traffic policy, which is reflected as RIB entries in the router's control plane, for traffic optimization and efficient routing. This model is used to manage traffic across the entire network. This model is a focused approach to traffic management and optimization across the entire network.
upvoted 1 times
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anonymousch
6 months, 2 weeks ago
Selected Answer: D
SDN Hybrid is the correct answer.
upvoted 3 times
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i9t6
6 months, 3 weeks ago
Selected Answer: D
Hybrid, the "On demand" can be interpreted as "allowing policy to be managed in a more centralized manner" https://learningnetwork.cisco.com/s/question/0D53i00000KsuxaCAB/sdn-models-doubts
upvoted 3 times
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Redrum702
7 months, 1 week ago
Selected Answer: A
Answer is A: SDN Centralized Model: Description: A single, central controller manages the entire network, maintaining a global view of the topology and making control decisions. Use Case: Simplified management, dynamic traffic engineering, and policy enforcement.
upvoted 1 times
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