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

A network automation engineer is building Python scripts to interact with Cisco DNA Center and RESTCONF API interfaces. Match each HTTP request configuration on the left to its corresponding RESTful API operational behavior on the right.

  • HTTP PUT to a specific resource URI with a Content-Type payloadCompletely replaces the target resource or creates it if non-existent, requiring a complete resource representation (Idempotent).
  • HTTP PATCH to a specific resource URI with a Content-Type payloadApplies partial modifications to the target resource, updating only specified fields while leaving unmentioned parameters unchanged.
  • HTTP POST to a collection URI with an Accept header specifiedCreates a subordinate resource under the specified parent collection while instructing the server on the expected response payload encoding format.
  • HTTP GET to a specific resource URI with an If-None-Match headerRequests resource retrieval conditionally based on ETag validation, receiving HTTP status 304 Not Modified if the payload is unchanged.

Answer

HTTP PUT maps to complete resource replacement (Idempotent); HTTP PATCH maps to partial modification of specified attributes; HTTP POST with an Accept header maps to creating a subordinate resource while specifying expected response encoding; HTTP GET with an If-None-Match header maps to conditional resource retrieval based on ETag validation.
Matching each HTTP request operation to its behavior requires analyzing HTTP verb semantics, idempotency, and header roles in REST APIs. PUT performs complete resource replacement (idempotent), PATCH performs partial attribute modification, POST creates new subordinate resources with Accept defining expected response formatting, and GET with If-None-Match enables conditional retrieval using ETags.

Step-by-Step Solution

1
Analyze HTTP PUT verb characteristics and CRUD mapping
PUT represents a full update/replace operation. It is idempotent and requires transmitting the complete payload structure to overwrite the existing target resource.
Differentiating PUT from PATCH requires recognizing full resource overwrite versus selective attribute modification.
2
Analyze HTTP PATCH verb characteristics and CRUD mapping
PATCH applies delta or partial updates, modifying only the fields included in the request body while leaving all unmentioned parameters intact.
PATCH minimizes payload bandwidth when altering isolated parameters within an existing configuration.
3
Analyze HTTP POST verb behavior and header roles
POST creates new child entities under a target collection endpoint. The Accept header indicates the media type (e.g., application/json) requested for the server's response.
Content-Type describes the request payload format sent to the server, while Accept specifies the desired response format returned by the server.
4
Analyze HTTP GET conditional request headers
GET retrieves resource state without side effects. Including If-None-Match allows the client to perform conditional validation against the server's ETag, saving bandwidth if un-modified.
Conditional headers optimize RESTful network automation workflows by preventing unnecessary data transmission.

Key Concept

Characteristics of REST-Based APIs (CRUD, HTTP Verbs, Data Formats)
Estimated Time:2m 0s
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Characteristics of REST-Based APIs (CRUD, HTTP Verbs, Data Formats)

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