JNCIA-DevOps NETCONF And XML API Practice Test 3 — 15 Questions

Question 1

You want to validate a candidate configuration on a Junos device without committing it using NETCONF. Which RPC accomplishes this?

Accepted Answer

. The RPC checks the consistency and validity of a specified configuration datastore.

Answer

<test-config>

Answer

<check-config>

Answer

<edit-config test-only="true"/>

Question 2

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 3

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 4

Which Junos XML API output format option allows requesting the output as plain text instead of structured XML?

Accepted Answer

format="text". Junos XML API allows requesting ASCII/text output format by appending the format='text' attribute to RPC requests.

Answer

output="ascii"

Answer

encoding="plain"

Answer

type="string"

Question 5

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

Question 6

An engineer applies a configuration change using NETCONF with <edit-config> and specifies default-operation="replace" at the top level, but includes an element with operation="merge". How does Junos evaluate this?

Accepted Answer

The specific element operation ('merge') takes precedence over the transaction-level default-operation ('replace').. Per-element operation attributes override the default-operation specified at the transaction level.

Answer

The transaction fails because default-operation and element operations conflict.

Answer

The device rolls back the configuration due to ambiguous parameters.

Answer

The default-operation takes precedence, ignoring the merge attribute.

Question 7

When retrieving operational data using the Junos XML API, how do you request pretty-printed or indented XML output?

Accepted Answer

Include the indent="true" attribute in the RPC request element.. Junos XML API supports formatting attributes such as indent="true" in RPC requests.

Answer

Add true inside the tag.

Answer

Use the NETCONF command-line flag --format-xml.

Answer

Set the environment variable JUNOS_XML_INDENT=1 in your shell.

Question 8

An administrator issues a NETCONF <get-config> request targeting the candidate datastore and includes a namespace prefix that does not match the device's loaded YANG/XML schema namespace. How does Junos respond?

Accepted Answer

The device returns an <rpc-error> indicating an invalid namespace or unrecognized element.. Mismatched or unknown namespaces in NETCONF requests result in a malformed message or invalid-element rpc-error.

Answer

The device falls back to default CLI parsing mode.

Answer

The session is immediately terminated by the SSH server.

Answer

The device automatically strips the namespace prefix and processes the request.

Question 9

Which NETCONF capability URI indicates that the server supports rolling back configuration changes to previous commit points?

Accepted Answer

Juniper specific capability strings for commit/rollback features advertised in the hello banner.. Junos supports rollback capabilities advertised via specific NETCONF capability URIs.

Answer

urn:ietf:params:netconf:capability:rollback-on-error:1.0

Answer

http://xml.juniper.net/netconf/junos/1.0

Answer

urn:ietf:params:netconf:base:1.0

Question 10

You want to retrieve the software version and hardware inventory of a Junos device in a single NETCONF request. Which RPC tag combines both hardware and software details?

Accepted Answer

Executing multiple RPCs or using container elements such as and .. The and RPCs can be combined, or can be used; however, Junos provides specific RPCs like .

Answer

<get-inventory-all>

Answer

<retrieve-device-state>

Answer

<get-hardware-and-software>

Question 11

An automation script executes a NETCONF <edit-config> transaction that updates multiple routing protocols. You need to ensure that the changes take effect immediately without requiring a manual commit. Does NETCONF require a separate commit for candidate changes?

Accepted Answer

Yes, changes applied to the candidate datastore require an explicit RPC to become active in running configuration.. When using the candidate datastore in NETCONF, changes must be explicitly committed using the RPC unless direct datastore is used.

Answer

Yes, but the commit must be initiated via CLI because NETCONF cannot commit.

Answer

No, NETCONF automatically commits all <edit-config> changes instantly.

Answer

Only if the target datastore is explicitly set to running.

Question 12

Which python module is part of the standard library that can be used to parse XML responses returned by NETCONF?

Accepted Answer

xml.etree.ElementTree. Python's built-in xml.etree.ElementTree module provides tools for parsing and navigating XML data.

Answer

netconf.parser

Answer

xml2dict

Answer

json

Question 13

Which TWO actions occur during the initial NETCONF session establishment phase between a client and a Junos device? (Choose two)

Accepted Answer

The client and server exchange messages to negotiate supported capabilities.. During session establishment, SSH authentication occurs first, followed by the exchange of messages containing capabilities.

Answer

The client sends an immediate <commit> RPC to initialize the session.

Answer

The routing engine reloads its control plane daemons.

Answer

The Junos device automatically locks the running configuration datastore.

Question 14

Which TWO configuration datastores are commonly supported and utilized when interacting with Junos devices via NETCONF? (Choose two)

Accepted Answer

candidate. Junos primarily supports the candidate and running datastores for configuration management via NETCONF.

Answer

startup

Answer

ephemeral

Answer

factory

Question 15

Which THREE error-type values are defined in the NETCONF protocol specification (RFC 6241) for categorizing <rpc-error> messages? (Choose three)

Accepted Answer

rpc. RFC 6241 defines transport, rpc, protocol, and application error types.

Answer

hardware

Answer

kernel