ch 12

10. What types of subscriptions are supported by model-driven telemetry? (Choose two.) a. Static b. Dynamic c. Configured d. Hard-coded

B, C. There are two types of telemetry subscriptions. With a dynamic subscription, the subscriber sends a request, usually via the ietf-yangpush.yang data model. A configured subscription is configured via the CLI, NETCONF, or RESTCONF and is persistent between reboots.

2. What is the default port on which the NETCONF protocol runs? a. TCP 22 b. TCP 830 c. UDP 161 d. UDP 69

B. By default, the NETCONF server on the device runs on TCP port 830 and uses the SSH process for transport.

6. Which of the following is a popular Python library used to interact with NETCONF servers? a. requests b. ncclient c. json d. pyang

B. One popular NETCONF client is the Python 3 ncclient library.

1. What network protocols support model-driven programmability? (Choose three.) a. NETCONF b. RESTCONF c. SSH d. gRPC

A, B, D. There are three standards-based programmable interfaces for operating on the YANG data models: NETCONF, RESTCONF, and gRPC.

7. Which of the following are used for data encapsulation in RESTCONF messages? (Choose two.) a. XML b. YANG c. YAML d. JSON

A, D. RESTCONF data is encoded with either XML or JSON. Compared with NETCONF, RESTCONF has added support for JSON encoding.

8. What NETCONF operation is the equivalent of the RESTCONF PATCH method? a. <edit-config> (operation="merge") b. <edit-config> (operation="create/replace") c. <edit-config> (operation="patch") d. <patch-config>

A. The PATCH method provides a resource patching mechanism. It is equivalent to the NETCONF <edit-config> operation with operation=merge.

9. What RESTCONF resource allows for automatic discovery of the API root? a. /discover/restconf b. /.well-known/restconf c. /.well-known/host-meta d. /discover/root

C. Per the RESTCONF standard, devices implementing the RESTCONF protocol should expose a resource called /.well-known/host-meta to enable discovery of root programmatically.

5. Which component of a YANG module header uniquely identifies a module? a. Prefix b. Notification c. Namespace d. Organization name

C. The YANG header contains the namespace for the module. The namespace is used to uniquely identify each module on a system that implements NETCONF.

4. Which data type is not a YANG base data type? a. Binary b. Enumeration c. Percent d. Empty

C. YANG defines a set of built-in types and has a mechanism through which additional types can be defined. There are more than 20 base types, including binary, enumeration, and empty. Percent is not a built-in data type.

3. What framework does NETCONF use to exchange messages between the client and the server? a. REST b. gRPC c. Apache Avro d. RPCs

D. Messages sent with NETCONF use remote procedure calls (RPCs), a standard framework for clients to send a request to a server to perform an action and return the results.