300-420 — Frequently Asked Questions

Advertising a single default route prevents aggregation switches from learning every core change, which stabilizes the network and saves memory on critical devices.

Pushing defaults to the access layer leaves the aggregation layer with full routing tables, failing to conserve memory on the more critical aggregation switches.

Shaping controls the rate of traffic you transmit to match circuit capacity, smoothing bursts toward the provider.

Policing inbound traffic caps incoming rates, preventing non-critical flows from overwhelming buffers and starving business-critical packets.

No. EPGs are specific to Cisco ACI. SD-Access uses Virtual Networks and Scalable Group Tags (SGTs) instead.

Yes. Both SD-Access and ACI overlay VXLAN using Virtual Network Identifiers (VNID) to segment tenants or VRFs.

Proactive Insights uses ML to find serious network-wide issues, while Client 360 focuses on contextual info for a single user.

Intelligent Capture performs proactive testing by generating synthetic traffic, distinct from the alerting function of Proactive Insights.

A Point of View report consolidates environment findings and recommends platform direction during the discovery phase.

It justifies the engagement before discovery begins, so it is not a discovery-phase output.

Discovery is the empathize phase: understand the current network state and customer needs, then map Cisco innovation (C); reference architecture (B) and PPDIOO (D) are design tasks.

Establishing credibility (E) is a soft skill, but the two discovery activities are gathering current network state (A) and mapping Cisco innovation to customer needs (C).

(B) and (D) belong to the design phase; PPDIOO and reference architecture guide design discussions, while discovery focuses on understanding the customer's current state (A) and needs (C).

Apple Insights is a real DNA Assurance feature, but the question's enumerated set — Network Time Travel, proactive guided remediation, on-premise and cloud analytics — excludes it.

Overlay Virtual Transport is a fabric and transport feature used in SD-Access design, not one of the assurance analytics differentiators the question asks for.

DNA Assurance runs analytics both on-premises and in the cloud, giving organizations local data control plus cloud-scale visibility, which competitors supposedly cannot match.