An infrastructure team is concerned about the shared memory utilization of a device, and for this reason, they need to monitor the device state. Which solution limits impact on the device and provides the required data?
Memory usage is measured in bytes and changes very frequently. On-change subscription will send data almost non-stop. In this case periodic change is more suitable.
On-change subscription is the solution that limits the impact on the device and provides the required data. On-change subscription allows for monitoring specific data in real-time, only sending the data when it changes, and not continuously. This can help limit the impact on device resources, such as shared memory utilization.
Creating an on-change subscription for a data node value that is known to change constantly would send excess data to the MDT stream, and could be detrimental to the data collection process. It is highly recommended to use periodic subscriptions for data node values that are constantly changing.
If the main goal is to have comprehensive, real-time updates on memory utilization with less impact, D (periodic subscription) could be more suitable since it ensures regular state data collection
D is correct. Periodic is more suitable for memory usage. "Periodic publication is perfect for counters or measures that constantly change, such as the current bandwidth utilization of your network interfaces."
https://community.dataminer.services/simplify-network-operations-with-telemetry-streaming-data/
Answer is C. With on-change subscriptions, the first push update is the entire set of subscribed to data (the initial sychronization as defined in the IETF documents). This is not controllable. Subsequent updates are sent when the data changes, and consist of only the changed data. However, the minimum data resolution for a change is a row. So, if an on-change subscription is to a leaf within a row, if any item in that row changes, an update notification is sent. The exact contents of the update notification depend on the transport protocol.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/prog/configuration/1612/b_1612_programmability_cg/model_driven_telemetry.html
concerned about the shared memory utilization of a device, and for this reason, they need to monitor the device state
question mention they are concerned and need to monitor, thus i believe D which is periodic subscription more suitable as they want to know memory utilization from time to time and For periodic subscriptions the update trigger is specified by time interval and an time for the report to be sent.
rather than on-change subscription an update trigger occurs whenever a change in the subscribed information is detected
Aggree on C as correct, that's exactly what on-change subscription is meant for (they monitor the state of the device (e.g. operational/non-operational) not the amount of memory used which might work with A (in SDA)
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C (change-on subscription) looks correct
There are two types of subscriptions: periodic and on-change. With periodic subscription, data is streamed out to the destination at the configured interval. It continuously sends data for the lifetime of that subscription. With on-change, data is published only when a change in the data occurs such as when an interface or OSPF neighbor goes down.
https://developer.cisco.com/docs/ios-xe/#!streaming-telemetry-quick-start-guide/streaming-telemetry
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