Refer to the exhibit. A Cisco engineer is implementing gRPC dial-out on an ASR. Receiver 192.168.1.1 will be assigned one of the subscriptions, and it will manage the ASR. Which command is needed to complete the router configuration?
The gRPC dial-out configuration examples configuration used gRPC as the protocol as mentioned already.
https://xrdocs.io/telemetry/tutorials/2016-07-21-configuring-model-driven-telemetry-mdt/
I think it is s tricky question, both protocols are supported:
Configure Dial-out Mode
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.
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.
If we supposed this is a 32bit device, tcp is the answer.
This is for TCP Dial-Out Router Config (but the question is talking about gRPC Dial-Out):
RP/0/RP0/CPU0:SunC(config)# telemetry model-driven
RP/0/RP0/CPU0:SunC(config-model-driven)# destination-group DGroup1
RP/0/RP0/CPU0:SunC(config-model-driven-dest)# address family ipv4 172.30.8.4 port 5432
RP/0/RP0/CPU0:SunC(config-model-driven-dest-addr)# encoding self-describing-gpb
RP/0/RP0/CPU0:SunC(config-model-driven-dest-addr)# protocol tcp
RP/0/RP0/CPU0:SunC(config-model-driven-dest-addr)# commit
https://xrdocs.io/telemetry/tutorials/2016-07-21-configuring-model-driven-telemetry-mdt/
C - protocol grpc
In the ASR config guide below, the configuration given for "Example: Destination Group for gRPC Dial-out" is using grpc.
It also says "If only the protocol grpc is configured without tls option, tls is enabled by default and tls-hostname defaults to the IP address of the destination."
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
for this question, my anwser is C, question is clearly tell implementation of gRPC Dial out.
if question is using other keyword such as implementation "telemetry or MDT" dial out, option "A. protocol TCP" could be the answer and Protocol gRCP also could be the answer. Both support Dial Out but only protocol gRCP support Dial In and Dial Out.
A is correct
since its only dial-out so it could be TCP or UDP. If it were both dial-in and dial-out then gRPC.
Model-driven telemetry (MDT) data is streamed through these supported transport mechanisms:
gRPC: used for both dial-in and dial-out modes.
TCP: used for only dial-out mode.
UDP: used for only dial-out mode.
Dial-in mode: The receiver dials in to the router and dynamically subscribes to one or more sensor paths or subscriptions. The router acts as the server and the receiver is the client. The router streams telemetry data through the same session. The dial-in mode of subscriptions is dynamic. This dynamic subscription terminates when the receiver cancels the subscription or when the session terminates.
Dial-out mode: The router dials out to the receiver. This mode of operation is the default one. The router acts as a client and receiver acts as a server. In this mode, sensor paths and destinations are configured and bound together into one or more subscriptions. The router continually attempts to establish a session with each destination in the subscription and streams data to the receiver. The dial-out mode of subscriptions is persistent. When a session terminates, the router continually attempts to re-establish a new session with the receiver every 30 seconds.
"If only the protocol grpc is configured without tls option, tls is enabled by default and tls-hostname defaults to the IP address of the destination" , grpc can be configured without any options as well.
It's A
supported transport mechanisms:
1. gRPC: used for both dial-in and dial-out modes.
2. TCP: used for only dial-out mode.
3. UDP: used for only dial-out mode
But to gRPC command: "protocol grpc tls-hostname <>" or "protocol grpc no-tls". Missing after grpc
https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-6/telemetry/configuration/guide/b-telemetry-cg-asr9000-66x/b-telemetry-cg-asr9000-66x_chapter_010.html
Agree A fits more. Lab'ed that A(tcp) is for dial-out; C(grpc) without any option would implies tls is enabled and tls-hostname defaults to the IP address of the destination.
I think it's C
telemetry model-driven
destination-group 1
address family ipv4 1.1.1.1 port 1111
protocol grpc
!
https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-5/telemetry/configuration/guide/b-telemetry-cg-asr9000-65x/b-telemetry-cg-asr9000-65x_chapter_010.html
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