300-420 Exam Dumps : Designing Cisco Enterprise Networks (ENSLD) v1.1

For model-driven telemetry with periodic updates, the architect must understand that each periodic update sends the subscribed data at the configured interval. Cisco telemetry guidance distinguishes periodic subscriptions from on-change subscriptions. A periodic subscription streams a full copy of the subscribed data element or table at each interval, even if the underlying state has not changed. That behavior is useful when the collector needs regular time-series samples, trending, or baseline monitoring, but it creates predictable bandwidth and collector-load requirements. On-change subscriptions are different: they publish updates when the subscribed state changes and are more efficient for state changes such as interface status, memory thresholds, or protocol adjacency m ovement. Empty subscription behavior and initial update timing may matter in specific implementations, but they are not the main design consideration in this question. Since the customer requires periodic updates, the design must size the transport, collector, retention system, and subscription intervals around repeated full data delivery. Reference topics: model-driven telemetry, periodic subscription, on-change subscription, YANG-modeled operational data, collector sizing.

The selected command is correct because the port is already restricted to one manually learned MAC address, and the requirement is to let the switch dynamically learn the connected endpoint while retaining port-security control. In Cisco Catalyst port security, a static secure MAC address is manually configured, while a sticky secure MAC address is dynamically learned and then added to the running configuration. This design is useful on access ports where the administrator wants the operational convenience of dynamic learning but still wants the switch to enforce the maximum secure-address limit. Once the endpoint MAC is learned, subsequent frames from different source MAC addresses can trigger the configured violation action, such as protect, restrict, or shutdown. The command must therefore enable sticky learning on the secured interface rather than simply changing the maximum, disabling port security, or configuring a normal switching feature. This is an access-layer security function, not a routing or QoS function. Reference topics: Catalyst port security, secure MAC addresses, sticky learning, access port hardening, Layer 2 campus design.

A migration from traditional IP-VPN service to Cisco SD-WAN commonly increases security and scalability. Cisco SD-WAN builds encrypted data-plane tunnels across supported transports, so the enterprise can use Internet, MPLS, or hybrid connectivity while maintaining secure site-to-site communication. The architecture also scales better operationally because policy, templates, onboarding, and routing control are centralized through the SD-WAN controllers and management plane. Increased solution complexity is not a desired characteristic; one of the design goals is to simplify operations through automation and centralized policy. Centralized application policies are also a major SD-WAN benefit, but when only two choices are selected, the stored answer emphasizes the two broad migration outcomes of security and scale. Distributed control plane is not correct because Cisco SD-WAN uses centralized control-plane logic with vSmart controllers distributing OMP routes and policies. A professional migration plan should validate transport diversity, controller redundancy, encryption policy, application-aware routing, and operational readiness. Reference topics: Cisco SD-WAN migration, encrypted overlay, scalability, centralized control plane, IP-VPN replacement.