Cisco Updated 350-601 Exam Questions and Answers by seb

 Streaming telemetry as a push model in Cisco devices refers to the mechanism where network devices send data in JSON or GPB format to configured endpoints without being requested for such data. This contrasts with traditional pull models where monitoring clients request data from network devices. References: Implementing and Operating Cisco Data Center Core Technologies (DCCOR v1.2)

https://developer.cisco.com/docs/ios-xe/#!streaming-telemetry-quick-start-guide/streaming-telemetry

The ACI REST API is a programmatic interface that uses REST architecture to interact with the management information tree (MIT) of the Cisco Application Policy Infrastructure Controller (APIC). The API requires authentication for users to access and manipulate the objects in the MIT. The authentication is based on username and password credentials, and the API provides several methods to manage the session authentication. Two of these methods are:

• POST to aaaLogin. This method logs in a user and opens a session. The message body contains an aaa:User object with the name and password attributes, and the response contains a session token and cookie. The session token and cookie are required for subsequent requests to the API, and they have a limited validity period that can be refreshed.
• DELETE to aaaLogout. This method logs out a user and closes a session. The message body contains an aaa:User object with the name attribute, and the response contains a status code indicating the success or failure of the operation. The session token and cookie are invalidated and cannot be used for further requests to the API.

References := The information is based on the Cisco APIC REST API Configuration Guide, which explains the usage and features of the ACI REST API, including the authentication methods89.

To meet the requirements of securing HSRP communication and supporting more than 300 groups, the commands needed are hsrp version 2 which allows for a greater number of HSRP groups (0-4095) and authenticate md5 key-chain NHRP-KEYS which provides MD5 authentication to secure HSRP updates.