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Difficulty: MediumCharacteristics of REST-Based APIs (CRUD, HTTP Verbs, Data Formats)

A network automation engineer is creating a script to manage device configurations via a Cisco RESTful API. Which two statements accurately describe the operational characteristics of HTTP verbs and request headers in this REST-based architecture?

  1. An HTTP PUT request sent to a configuration resource endpoint replaces the target resource in its entirety with the payload supplied in the request.Answer
  2. The Content-Type request header communicates to the REST API server the specific data serialization format used within the request body.Answer
  3. C
    An HTTP PATCH request requires the payload to contain a full representation of all resource attributes to avoid deleting unreferenced fields.
  4. D
    The HTTP POST method is inherently idempotent, ensuring that repeated identical requests to a resource endpoint yield identical server resources.

Answer

The two correct statements are that an HTTP PUT request replaces the target resource in its entirety with the provided payload, and the Content-Type request header specifies the serialization format of the request body.
In RESTful web services, HTTP PUT maps to replacing an existing resource in its entirety with the payload sent by the client. Additionally, the Content-Type request header explicitly tells the API server how to deserialize the incoming payload format (e.g., application/json).

Step-by-Step Solution

1
Analyze the functional behavior of HTTP PUT versus HTTP PATCH in RESTful architectures.
HTTP PUT performs a complete replacement (Update/Create) of the target resource using the provided payload. Conversely, HTTP PATCH performs a partial update, updating only the attributes included in the request payload.
Understanding resource replacement mechanics prevents accidental loss of configuration parameters during API calls.
2
Evaluate the idempotency characteristics of HTTP verbs.
HTTP GET, PUT, and DELETE are idempotent because executing them repeatedly produces the same server state. HTTP POST is non-idempotent because consecutive requests typically instantiate duplicate resources.
Differentiating idempotent operations ensures script execution safety and predictable API interactions.
3
Examine HTTP header roles for payload processing.
The Content-Type header indicates the format (such as JSON or XML) of the data being sent to the server in the request body, whereas the Accept header specifies the data format expected in the response body.
Proper header specification allows the client and server to negotiate content serialization correctly.

Key Concept

REST API HTTP Verbs (CRUD operations, idempotency, PUT vs PATCH) and HTTP Headers (Content-Type vs Accept)
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Topics

Characteristics of REST-Based APIs (CRUD, HTTP Verbs, Data Formats)

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