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

Question 1

Which THREE distinct operational states or configuration views can be queried using specific Junos XML API RPCs? (Choose three)

Accepted Answer

System information via <get-system-information>. Junos XML API provides dedicated RPCs for system information, interface information, and chassis inventory.

Answer

BGP routing table via <get-bgp-kernel-table>

Answer

Firewall filter logs via <get-security-packet-capture>

Question 2

Which TWO tools or protocols can be used to interact with the Junos XML API besides NETCONF over SSH? (Choose two)

Accepted Answer

Junos PyEZ library. Junos XML API can be accessed via NETCONF over SSH or via HTTP/HTTPS using the Junos XML API over HTTP server.

Answer

Syslog over UDP port 514

Answer

RADIUS authentication protocol

Answer

SNMP v3 traps

Question 3

Which TWO statements are true regarding NETCONF locking mechanisms on Junos devices? (Choose two)

Accepted Answer

If a NETCONF session terminates unexpectedly, any locks held by that session are automatically released by the device.. Locks prevent concurrent configuration edits and can be released via explicit unlock or session termination.

Answer

Multiple concurrent NETCONF sessions can obtain exclusive write locks on the candidate datastore at the same time.

Answer

Locks can only be released by rebooting the Routing Engine.

Answer

Locking is strictly mandatory for every single <get-config> request.

Question 4

Which TWO operations are valid targets for the NETCONF <get-config> RPC on a Junos device? (Choose two)

Accepted Answer

. allows querying configuration datastores such as candidate and running.

Answer

<factory-default/>

Answer

Answer

<active-alarm/>

Question 5

Which THREE error-tag values defined in NETCONF RFC 6241 may be returned by a Junos device when an edit-config operation fails validation? (Choose three)

Accepted Answer

invalid-value. RFC 6241 error-tags include invalid-value, missing-element, data-exists, and in-use.

Answer

syntax-timeout

Answer

buffer-overflow

Question 6

Which TWO benefits does NETCONF provide over traditional screen-scraping CLI automation? (Choose two)

Accepted Answer

Structured data representation (XML) that eliminates the need for complex regular expression parsing.. NETCONF provides structured XML/YANG data formats and reliable error handling compared to fragile CLI screen scraping.

Answer

Automatic generation of physical fiber cabling diagrams.

Answer

Elimination of any need for authentication credentials.

Answer

Requirement for lower bandwidth links by compressing all payloads into binary audio streams.

Question 7

Which THREE parameters can be included within a Junos NETCONF <commit> RPC request to customize commit behavior? (Choose three)

Accepted Answer

integer . Junos commit RPC options include comment, confirmed, and check (validate).

Answer

<max-rollback-files> integer </max-rollback-files>

Answer

<encryption-key> string </encryption-key>

Question 8

Which TWO methods can an administrator use to verify that a Python script successfully established a NETCONF session with a Junos device? (Choose two)

Accepted Answer

Run 'show system netconf sessions' on the Junos CLI.. Session verification can be performed by checking active system sessions on the device or inspecting script connection outputs.

Answer

Review BGP neighbor adjacency tables.

Answer

Verify physical interface link LEDs.

Answer

Check the device temperature sensors.

Question 9

Which TWO conditions will cause a NETCONF <edit-config> transaction to fail on a Junos device? (Choose two)

Accepted Answer

Syntax errors in the XML payload structure.. Transactions fail due to syntactic errors, missing required fields, or validation failures.

Answer

Executing a successful <commit> immediately after editing.

Answer

Using a valid namespace prefix declared in the NETCONF hello message.

Answer

Locking the candidate datastore prior to making edits.

Question 10

A network engineer is establishing a NETCONF session with a Junos device and needs to lock the candidate configuration to prevent concurrent modifications by other administrators. Which NETCONF operation should be executed?

Accepted Answer

. The operation allows a client to lock the configuration datastore of a device to prevent unauthorized or conflicting changes during a transaction.

Answer

<lock-config><database>candidate</database></lock-config>

Answer

<get-config><source><candidate/></source><lock/></get-config>

Answer

<edit-config><target><candidate/></target><operation>lock</operation></edit-config>

Question 11

Which THREE attributes are available within the <edit-config> operation element in NETCONF to specify the modification action on a target node? (Choose three)

Accepted Answer

delete. NETCONF edit-config operation attributes include merge, replace, create, delete, and remove.

Answer

append

Answer

modify

Question 12

An automation script connects to a Junos device using NETCONF over SSH and retrieves the running configuration. The engineer notices that the retrieved XML elements contain attributes like 'operation="inherit"'. What do these attributes represent in the context of Junos XML API?

Accepted Answer

They describe the configuration hierarchy manipulation state, indicating whether a statement is inherited from apply-groups or explicitly defined.. Junos XML output uses attributes such as 'operation' to indicate how configuration statements relate to inheritance, deletion, or modification within hierarchical structures.

Answer

They indicate the automation user permission level required to modify that specific node.

Answer

They represent transient states of the NETCONF parser buffer indicating stream synchronization status.

Answer

They represent mapping hints for how Junos hierarchical statements map to hierarchical template inheritances during operational state generation.

Question 13

An automation engineer is writing an application that sends an RPC to a Junos device to load a replacement configuration. The requirement is to completely replace the candidate configuration with the provided configuration content. Which element and attribute combination should be used inside the request?

Accepted Answer

replace. To replace the entire configuration or a specific hierarchy level, the element can be set to 'replace', or the element itself can carry the operation='replace' attribute.

Answer

<load-options>replace</load-options>

Answer

replace-all

Answer

<action>overwrite</action>

Question 14

During troubleshooting of a Python script using the ncclient library to interact with a Junos device, an automation engineer observes a 'rpc-error' response containing an error-tag of 'operation-failed'. Upon examining the Junos system logs, it is discovered that the candidate configuration had syntax errors introduced by an uncommitted previous session. Which NETCONF capability negotiation mechanism ensures that the client is aware of the exact XML schema constraints before sending the RPC?

Accepted Answer

NETCONF capability URIs exchanged during the initial hello message exchange.. NETCONF hello messages exchange capabilities, which include URLs pointing to XML namespaces and data models such as YANG modules or Junos specific DTDs/XSDs.

Answer

The <get-schema> RPC operation defined in RFC 6020.

Answer

The automatic download of Junos PyEZ schema definitions during the SSH handshake phase.

Answer

The automated execution of a pre-flight XML validation check via the <validate> RPC.

Question 15

An administrator needs to execute a NETCONF RPC that triggers a Junos operational command equivalent to 'clear interfaces statistics ge-0/0/0'. How should this request be formatted using the Junos XML API?

Accepted Answer

ge-0/0/0

. Operational commands (RPCs) are sent as raw XML elements corresponding to CLI commands under the wrapper or directly as named RPC tags (e.g., clear interfaces statistics interface-name ge-0/0/0 or its native equivalent).

Answer

clear interfaces statistics ge-0/0/0

Answer

Answer