CCNP Practice Question: Examine the following telemetry configuration on…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  Data is pushed only when a change occurs in the state of GigabitEthernet0/0/0.

  Why this is correct

  The update-policy on-change setting makes the subscription push telemetry only when the subscribed YANG state data changes, rather than at fixed intervals. The xpath filter scopes this to GigabitEthernet0/0/0's state, so no periodic stream occurs while values remain static.

• ✗

  Data is pushed every 200 seconds to the collector.

  Why it's wrong here

  The number 200 is the subscription identifier, not a timer; update-policy on-change means data is pushed only when the monitored state changes. It is tempting because subscription IDs resemble interval values, and a periodic subscription would be correct if the configuration instead specified update-policy periodic with a time interval.

• ✗

  The subscription uses JSON encoding.

  Why it's wrong here

  The encoding is encode-kvgpb, which serialises telemetry as key-value pairs over gRPC, not JSON. It is tempting because JSON is a common telemetry format, and encode-json would be correct if the subscription were configured to send JSON-encoded data to the collector.

• ✗

  The filter selects all interfaces, not just GigabitEthernet0/0/0.

  Why it's wrong here

  The XPath predicate [name='GigabitEthernet0/0/0'] restricts the filter to that single interface, so other interfaces are excluded. It is tempting because XPath filters can select whole lists, and omitting the predicate would be correct when telemetry for every interface on the device is required.