Dedicated Control-Plane Nodes for Frequent Endpoint Roaming

Describe SD-Access fabric design considerations for wired and wireless access (overlay, fabric design, control plan design, border design, segmentation, virtual networks, scalability, over the top and fabric for wireless, multicast)

Answer Correct answer: B — Dedicated control-plane nodes are advised for frequent endpoint roaming across fabric edges, so the mapping database scales and roaming is efficient.

When is it advisable to provide dedicated control plane nodes within a Cisco SD-Access design?

in a small deployment where border nodes are not required
when there is a requirement for frequent roaming of endpoints across fabric edge nodes Correct Answer
in designs without Cisco DNA Center
in a design where fabric edge nodes are unable to provide control plane functionality

Community Votes

100%

100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.

Community Insight

Dedicated CP nodes = scalability + roaming support. Frequent roaming (B) is the trigger; a small stable deployment or 'no DNA Center' are not reasons to add dedicated CP nodes.

Cisco SD-Access recommends dedicated control-plane (CP) nodes when the design needs to scale the host-to-location mapping database and support features like frequent endpoint roaming across fabric edge nodes. In small, stable deployments the edge nodes can hold the CP function.

Picking A/C/D: small deployments (A) and designs without DNA Center (C) do not call for dedicated CP nodes; edge nodes unable to provide CP (D) is not the normal trigger — frequent roaming (B) is.

Community Discussion (3 comments)

PicoOstrava 👍 3 Selected: B

The correct answer is: B. when there is a requirement for frequent roaming of endpoints across fabric edge nodes Explanation: In Cisco SD-Access, dedicated control plane nodes are recommended when there is a need for scalability and to support features like frequent roaming of endpoints. This ensures that the control plane can manage the mapping database efficiently, avoiding potential performance issues that might arise if control plane functionality were distributed across fabric edge nodes. Option D (in a design where fabric edge nodes are unable to provide control plane functionality) could also seem relevant, but the best answer for scalability and optimal performance, especially for endpoint mobility, is B.

muffedtrims 👍 2 Selected: B

Answer is B after reading Swiz005 source

Swiz005 👍 3 Selected: B

Answer is B Source - https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html#:~:text=One%20other%20consideration,should%20be%20used.

Comments & Corrections

No comments yet — spotted an error or have a note? Share it below.

Expert Analysis

Why the Answer Is Correct

B is correct. Cisco recommends dedicated control-plane nodes when endpoints roam frequently across fabric edge nodes, because the CP holds the host-to-location mapping database and dedicated nodes let it scale and handle roaming efficiently.

Why the Other Options Are Wrong

A (small deployment without border nodes) and C (no DNA Center) are not triggers for dedicated CP nodes; in small stable designs the edge nodes can serve as CP. D (edge nodes unable to provide CP) is not the typical design driver — frequent roaming is.

Community Comment Notes

The vote is B (100). Commenters cite the SDA design guide: dedicated CP nodes are recommended for scalability and frequent endpoint roaming across fabric edges.

Official Reference

https://www.cisco.com/c/en/us/solutions/enterprise-networks/software-defined-access.html

Related Analysis

Practice All 300-420 Questions

Access 150 questions with complete answers and detailed explanations.

View Full 300-420 Practice Test →

← Back to 300-420 Study Guide