Cisco Updated 350-401 Exam Questions and Answers by dean

 The output confirms that the switch is running Per-VLAN Spanning Tree Plus (PVST+), which is indicated by the presence of a unique Spanning Tree instance for VLAN 20. PVST+ is a Cisco enhancement of the original IEEE 802.1D Spanning Tree Protocol (STP) that provides for separate 802.1D spanning trees for each VLAN configured in the network; this allows for better load balancing.

References: Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) v1.1

The Intent API is aNorthbound REST APIthat exposes specific capabilities of the Cisco DNA Center platform. The Intent API provides policy-based abstraction ofbusiness intent, allowing focus on an outcomerather than struggling with individual mechanisms steps.

When a switch running Per-VLAN Spanning Tree Plus (PVST+) is added to a network with switches running Rapid PVST+, the network supports both protocols simultaneously due to the backward compatibility of Rapid PVST+ with PVST+. The existing switches will continue to operate using Rapid PVST+, while the newly added switch will operate using its configured protocol, which is PVST+. This ensures that there is no disruption in service and that spanning tree continues to prevent loops as expected.

Northbound APIs in the context of Software-Defined Networking (SDN) provide a means for applications and services to communicate with the SDN controller. These APIs allow for the programmatic control of network resources that have been abstracted by the controller, enabling efficient orchestration and automation of the network to align with the needs of different applications. This facilitates a dynamic and flexible approach to network management that is not possible with traditional networking methods. References := What are SDN Northbound APIs