JNCIA-DevOps NETCONF And XML API — 10 Questions

Question 1

You want to retrieve only the system hostname from the Junos running configuration using NETCONF. Which filtering technique is most efficient?

Accepted Answer

Subtree filtering using XML element tags matching the configuration hierarchy. Tag-based filtering allows requesting specific configuration hierarchies by including empty container tags in the <get-config> request.

Answer

XPath expression filtering via the select attribute

Answer

Regular expression pattern matching within the <filter> attribute

Answer

Retrieving the entire configuration and parsing it locally with a Python script

Question 2

You need to commit a candidate configuration change on a Junos device via NETCONF with a confirmed commit timeout of 5 minutes. Which XML payload structure is correct?

Accepted Answer

5

. The RPC accepts a tag and a element to specify rollback timing.

Answer

Answer

Answer

Question 3

You are troubleshooting a NETCONF session where the client sent an improperly formatted XML payload. Where would you expect to find detailed error logging related to this malformed XML request on the Junos device?

Accepted Answer

NETCONF traceoptions output file or /var/log/messages. Junos logs NETCONF and XML API activity, including parsing errors, into the traceoptions log file if configured, or general system logs.

Answer

/var/log/netconf.log

Answer

/var/db/config/juniper.conf.gz

Answer

/etc/netconf/errors.xml

Question 4

Which command or tool on a Junos device verifies that the NETCONF subsystem is enabled and listening for SSH connections?

Accepted Answer

show system services netconf ssh. NETCONF over SSH runs as a subsystem on Junos and can be verified via system services configuration or operational commands.

Answer

show netconf settings

Answer

show xml-api status

Answer

show netconf status connections

Question 5

In Junos XML API, what is the XML namespace associated with Junos-specific RPCs and operational tags?

Accepted Answer

http://xml.juniper.net/junos/*/junos-rpc. Junos XML API elements use specific namespaces like http://xml.juniper.net/junos/12.1X46/junos-sw for software or general rpc namespaces.

Answer

http://www.cisco.com/ns/yang/cisco-se

Answer

urn:juniper:params:xml:ns:netconf:base:1.0

Answer

urn:ietf:params:xml:ns:netconf:base:1.0

Question 6

You are configuring NETCONF traceoptions on a Junos device to debug an XML parsing issue. Which configuration statement enables logging of all NETCONF protocol messages to a file named 'netconf-debug.log'?

Accepted Answer

set system services netconf traceoptions file netconf-debug.log
set system services netconf traceoptions flag all. Traceoptions under the netconf system services hierarchy control logging of NETCONF traffic.

Answer

set protocols netconf traceoptions file netconf-debug.log flag detail

Answer

set security netconf logging file netconf-debug.log

Answer

set system netconf trace file netconf-debug.log level debug

Question 7

When you issue a NETCONF <get-config> request for the running configuration, why might the request fail or return empty on certain Junos platforms?

Accepted Answer

The <running/> datastore capability is supported, but explicit locking rules or device state might restrict it if unsupported parameters are sent.. In standard NETCONF (RFC 6241), the running datastore must be supported, but Junos requires candidate configuration usage for edits; however, running is supported for reading. If it fails, it is often due to datastore capability support.

Answer

Running configuration can only be accessed using CLI commands, never NETCONF.

Answer

The <running/> tag must always be accompanied by a password attribute.

Answer

Junos does not support reading the running configuration datastore via NETCONF.

Question 8

You need to execute a Junos CLI command (such as 'show version') as an XML RPC request via NETCONF. Which RPC tag encapsulates raw Junos CLI operational commands?

Accepted Answer

show version. The tag allows executing arbitrary operational CLI commands formatted as text within the Junos XML API.

Answer

show version

Answer

show version

Answer

show version

Question 9

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 10

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"