Refer to the exhibit. A network engineer must manage the network devices. The engineer prepares a Python scripts to authenticate to the Cisco to DNA Center API and request a device list. The device request fails and returns errors code 401. Which action solves the problem?

The script successfully requests an authentication token in the first block but fails to include that token in the second request (requests.get). In Cisco DNA Center APIs, the /dna/system/api/v1/auth/token endpoint returns a service ticket. This ticket must be included in the headers of subsequent API calls (like the device list request) using the key X-Auth-Token. The 401 Unauthorized error occurs because the headers variable used in the requests.get call only contains the Content-Type, leaving the request unauthenticated. Adding the acquired token to the header resolves the issue.

Option A is incorrect: The URL /dna/intent/api/v1/network-device is the correct and official endpoint for retrieving the network device list in Cisco DNA Center.

Option B is incorrect: An HTTP 401 error is an authentication failure, not a network layer issue. If there were reachability issues, the script would return a connection timeout or "No route to host."

Option D is incorrect: The 401 error occurs during the second request (device list), not the first. The first request (authentication) likely succeeded since the script proceeded to the next block.

Cisco DevNet Documentation: Cisco DNA Center REST API Guide - Authentication. (Specifies that the token must be passed in the X-Auth-Token header for all subsequent calls).

Cisco DNA Center Platform Documentation: Intent API Reference - Get Device List. (Validates the endpoint URL used in the exhibit).

RFC 7235: Hypertext Transfer Protocol (HTTP/1.1): Authentication. Section 3.1: 401 Unauthorized. (Defines the 401 status code as a lack of valid authentication credentials).

Cisco Learning Network: Programming for Cisco DNA Center (NPDEV). (Provides code patterns for multi-step REST API interactions requiring token persistence).