3 Network Controllers and Intent-Based Management Free Online FlashCards

What does a network controller do?

A network controller gathers network information, coordinates or makes decisions, and communicates changes to devices or other systems.

What do northbound interfaces connect?

Northbound interfaces connect controllers to applications, orchestration systems, and operators.

Does a centralized controller have to run on one server?

Centralized describes a unified view and point of administration; the controller software can still run across several machines.

What may happen to traffic forwarding during a controller outage?

The effect depends on the architecture and controlled function. Some devices may continue forwarding traffic even when their controller connection is interrupted.

What does intent express in intent-based networking?

Intent is a declarative expression of operational goals and outcomes that does not specify how to implement them.

How does intent differ from device-level implementation steps?

Intent states the desired outcome; device commands and configuration steps describe an implementation plan.

How does a policy differ from intent?

A policy specifies rules that govern behavior, often in an event-condition-action form; intent describes a desired outcome.

What does intent assurance check?

Assurance observes network state and service outcomes, compares them with the requested goal, and reports whether the goal is being met.

What is intent drift?

Intent drift occurs when a network that once met a goal later stops meeting it.

Why is an accepted API request not proof that a change succeeded?

An accepted request does not prove that the change completed successfully; check the job status and resulting network behavior.

How do YANG, NETCONF, and RESTCONF relate?

YANG models network configuration and state; NETCONF and RESTCONF provide protocols for interacting with YANG-modeled data. Using them alone does not make an operation intent-based.

What is the role of southbound interfaces?

Southbound interfaces let controllers read state from and configure network devices or elements.