Suggested Answer:
In a dial-in mode, the destination initiates a session to the router and subscribes to data to be streamed. Dial-in mode is supported over gRPC in only 64-bit platforms. In a dial-out mode, the router initiates a session to the destinations based on the subscription. All 64-bit IOS XR platforms (except for NCS 6000 series routers) support gRPC and TCP protocols. All 32-bit IOS XR platforms support only TCP. Reference: https://www.cisco.com/c/en/us/td/docs/iosxr/asr9000/telemetry/b-telemetry-cg-asr9000-61x/b-telemetry-cg-asr9000-61x_chapter_010.html#id_36445
The answer is correct.
Model-Driven Telemetry (MDT) data is streamed through :
Transmission Control Protocol (TCP): used for only dial-out mode.
User Datagram Protocol (UDP): used for only dial-out mode.
See Transport and Encoding
https://www.cisco.com/c/en/us/td/docs/iosxr/asr9000/telemetry/b-telemetry-cg-asr9000-61x/b-telemetry-cg-asr9000-61x_chapter_011.html
I guess the answer is correct, since gRCP needs to be configured and maintained - there is a 3-Way handshake (TCP) in every direction but gRPC means that this is the way to retrieve/stream data which works if 'Pulling' via gRPC configures only ...closest to what i can explain
It is correct.
Model-Driven Telemetry (MDT) data is streamed through :
Transmission Control Protocol (TCP): used for only dial-out mode.
User Datagram Protocol (UDP): used for only dial-out mode.
https://www.cisco.com/c/en/us/td/docs/iosxr/asr9000/telemetry/b-telemetry-cg-asr9000-61x/b-telemetry-cg-asr9000-61x_chapter_011.html#id_36270
I think that the answer is right:
https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/telemetry/70x/b-telemetry-cg-ncs5500-70x/b-telemetry-cg-ncs5500-70x_chapter_01.html pag.26
Dial-In (Dynamic)
1.Telemetry updates are sent to the initiator or subscriber.
2.Life of the subscription is tied to the connection (session) that created it, and over which telemetry updates are sent. No change is observed in the running configuration.
3.Dial-in subscriptions need to be reinitiated after a reload, because established connections or sessions are killed during stateful switchover.
4.Subscription ID is dynamically generated upon successful establishment of a subscription.
Dial-Out (Static or Configured)
1.Telemetry updates are sent to the specified receiver or collector.
2.Subscription is created as part of the running configuration; it remains as the device configuration till the configuration is removed.
3.Dial-out subscriptions are created as part of the device configuration, and they automatically reconnect to the receiver after a stateful switchover.
4.Subscription ID is fixed and configured on the device as part of the configuration.
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