JNCIA-DevOps NETCONF And XML API Practice Test 4 — 15 Questions

Question 1

An automation script attempts to load a configuration snippet using NETCONF <edit-config> with operation="delete" on a container statement. What happens if the specified container does not currently exist in the candidate configuration?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

The device returns a NETCONF rpc-error indicating the node does not exist.. The delete operation fails if the target node does not exist, whereas remove is silent if absent.

Answer

The device ignores the request and returns an OK response.

Answer

The device converts the operation to a merge automatically.

Answer

The device automatically creates the container as an empty object.

Question 2

When establishing a NETCONF session over SSH, which standard capability announcement is exchanged during the initial hello message phase?

Accepted Answer

urn:ietf:params:netconf:base:1.0. NETCONF capabilities are exchanged in <hello> messages at session startup, referencing URIs like urn:ietf:params:netconf:base:1.0.

Answer

http://xml.juniper.net/junos/rpc/v1

Answer

netconf:params:xml:ns:netconf:base:2.0

Answer

urn:juniper:params:netconf:ssh:1.0

Question 3

When executing a NETCONF request, you specify but omit any filtering tags. What is returned in the ?

Accepted Answer

The complete configuration contained within the candidate datastore.. Omiting filter tags on a <get-config> request returns the entire contents of the specified configuration datastore.

Answer

An rpc-error stating that a filter is mandatory.

Answer

Only the differences between candidate and running configurations.

Answer

Only the top-level system hierarchy statements.

Question 4

Which tool or library is commonly used in Python to simplify interacting with Junos NETCONF APIs by abstracting low-level XML handling?

Accepted Answer

Junos PyEZ (juniper-eznc). PyEZ is Juniper's official Python library designed specifically for interacting with Junos devices via NETCONF.

Answer

Netmiko

Answer

Paramiko

Answer

Requests

Question 5

You need to load a set of configuration changes into the Junos candidate datastore from an inline XML string using NETCONF. Which RPC element is used to load configuration data?

Accepted Answer

. The RPC is a Juniper-specific extension used within NETCONF to load configuration data with formats like XML, text, or set.

Answer

<update-candidate>

Answer

<set-config>

Answer

<edit-config>

Question 6

An automation script performs a NETCONF transaction that triggers an alarm. You want to retrieve current system alarms using the Junos XML API. Which RPC tag represents this request?

Accepted Answer

. The RPC retrieves active system alarms from the Junos device.

Answer

<retrieve-alarms>

Answer

<get-system-alarms>

Answer

<get-chassis-alarms>

Question 7

What is the purpose of the <hello> element exchanged immediately after establishing a NETCONF SSH session?

Accepted Answer

To exchange supported protocol capabilities and namespace identifiers.. The <hello> element is used by both client and server to exchange supported capabilities and session parameters.

Answer

To authenticate the SSH username and password.

Answer

To request an immediate reboot of the Junos routing engine.

Answer

To lock the candidate configuration database automatically.

Question 8

An automation script executes a NETCONF <get-config> query with a specific subtree filter for interface statistics. However, the response contains configuration data instead of operational statistics. Why did this occur?

Accepted Answer

The RPC targets configuration datastores, whereas interface statistics are operational state data retrieved via the RPC.. retrieves configuration data, whereas operational statistics require the RPC with operational filters.

Answer

The session was not locked prior to executing the query.

Answer

Interface statistics cannot be retrieved via NETCONF; CLI parsing is required.

Answer

The subtree filter syntax was invalid, causing the device to fallback to the default configuration view.

Question 9

You send an edit-config RPC with an invalid XML tag name. What is the standard structure of the error returned in the <rpc-reply>?

Accepted Answer

An element containing diagnostic sub-elements like and .. NETCONF errors are returned inside an element containing details such as error-type, error-tag, and error-message.

Answer

A standard Linux kernel panic log string.

Answer

An HTTP 400 Bad Request status code.

Answer

A syslog message printed directly to the terminal emulator.

Question 10

What is the role of the <rpc> element in a NETCONF message exchange?

Accepted Answer

It acts as a wrapper enclosing the specific NETCONF method request sent by the client to the server.. The <rpc> element is the protocol envelope used by the client to send a request to the NETCONF server.

Answer

It defines the security credentials for SSH authentication.

Answer

It stores error logs returned by the Junos routing engine.

Answer

It terminates the NETCONF session upon completion.

Question 11

Which Junos configuration statement enables the NETCONF service over SSH for remote automation clients?

Accepted Answer

set system services netconf ssh. Enabling NETCONF on Junos requires configuring the system services netconf ssh hierarchy.

Answer

set protocols netconf enable

Answer

set netconf ssh-server enable

Answer

set system xml-api netconf enable

Question 12

When using NETCONF to edit a Junos configuration, you include the attribute operation="create" on an existing configuration leaf. What behavior does the device exhibit?

Accepted Answer

The device returns an rpc-error indicating that the target data model element already exists.. The 'create' operation adds a configuration node only if it does not already exist; if it exists, it returns an error.

Answer

The attribute is ignored, and the operation defaults to merge.

Answer

The configuration value is updated successfully.

Answer

The existing node is deleted and recreated with the new value.

Question 13

An automation script attempts to unlock a candidate configuration datastore that was previously locked by a different NETCONF session. Which RPC is required to force-terminate that session and release the lock?

Accepted Answer

...

. The RPC allows terminating another active NETCONF session, which automatically releases any locks held by that session.

Answer

Answer

<release-lock session-id="..."/>

Answer

<close-session><session-id>...</session-id></close-session>

Question 14

You are writing a script that parses NETCONF responses from Junos. You encounter an element named inside an . What does this indicate?

Accepted Answer

The NETCONF operation completed successfully with no error or data payload to return.. The <ok/> tag indicates that the requested NETCONF operation executed successfully with no data to return.

Answer

The SSH tunnel has been successfully authenticated.

Answer

The candidate configuration has uncommitted changes.

Answer

The device CPU utilization is normal.

Question 15

What is the standard IETF RFC that defines the core NETCONF protocol architecture and operations?

Accepted Answer

RFC 6241. RFC 6241 is the definitive IETF standard defining the NETCONF Configuration Protocol.

Answer

RFC 8040

Answer

RFC 4253

Answer

RFC 7950