Rest Apis Json

REST APIs & JSON for CCNA 200-301 REST APIs and JSON together form the communication backbone of modern network automation — the exam tests your ability to recognize HTTP methods, interpret status codes, and read basic JSON syntax, all as multiple-choice questions with no CLI involved. --- ## Why REST APIs Exist in Networking Traditional network management means logging into each device individually via CLI. Controller-based architectures (like Cisco Catalyst Center) instead expose a northbound API that lets software talk to the controller programmatically. REST (Representational State Transfer) is the dominant API style used for this purpose. Understanding REST APIs lets you grasp *how* automation tools like Ansible or Python scripts actually communicate with network controllers — and the exam will test the vocabulary and mechanics directly. --- ## What Makes an API "RESTful" A REST API (Representational State Transfer API) follows a set of architectural constraints: | Constraint | Plain-English Meaning | |---|---| | Stateless | Each request carries all the info needed — the server stores no session state between requests | | Client-Server | The client (your script) and server (the controller) are separate, communicating over HTTP/HTTPS | | Uniform Interface | Standard HTTP methods are used consistently | | Resource-Based | Everything is a "resource" (a device, an interface, a VLAN) accessed via a URI (Uniform Resource Identifier) | The stateless constraint is the most exam-tested characteristic. Each API call must be self-contained. --- ## HTTP Methods (CRUD Operations) REST APIs use standard HTTP verbs to perform actions on resources. Map them to the CRUD model: | HTTP Method | CRUD Action | What It Does | |---|---|---| | GET | Read | Retrieve information…