JNCIA-DevOps Junos Automation Stack And DevOps Concepts Practice Test 3 — 15 Questions

Question 1

You are configuring a webhook in your version control system to trigger an automated CI/CD pipeline whenever a developer pushes a configuration commit to the main branch of your Junos automation repository. What security mechanism should be implemented on the receiving pipeline webhook endpoint?

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

Accepted Answer

Validating a shared secret token or HMAC cryptographic signature sent in the webhook request headers.. Webhooks should be secured using secret tokens or HMAC signatures to ensure requests genuinely originate from the trusted VCS platform.

Answer

Opening TCP port 22 directly to the public internet without firewall rules.

Answer

Hardcoding the developer's Linux user password inside the webhook listener script.

Answer

Disabling all SSL/TLS certificates to allow unencrypted HTTP packet inspection.

Question 2

When designing a version control workflow for Junos configurations using Git, which THREE practices are considered industry best standards? (Choose three)

Accepted Answer

Using feature branches for developing new configuration changes before merging into main. Best practices include code reviews via pull requests, using feature branches, and keeping secrets out of code.

Answer

Completely bypassing automated testing to speed up deployments

Answer

Storing plaintext administrative passwords directly in public Git repositories

Question 3

Which TWO components are essential parts of a model-driven network automation architecture on Junos devices? (Choose two)

Accepted Answer

YANG data models defining the structure and constraints of configuration and state data. Model-driven architecture relies on structured data models (YANG) and standardized transport protocols (NETCONF, gRPC).

Answer

Manual terminal emulation sessions using Telnet

Answer

Proprietary screen-scraping PERL scripts parsing raw CLI text

Answer

Physical serial port multiplexers

Question 4

In Git version control, which TWO commands are used to integrate changes from one branch into another? (Choose two)

Accepted Answer

git merge. Git uses 'merge' and 'rebase' to integrate changes between branches.

Answer

git init

Answer

git status

Answer

git clone

Question 5

Which TWO file formats are commonly used for structuring network configuration data and automation templates in Junos DevOps pipelines? (Choose two)

Accepted Answer

JSON. YAML and JSON are standard data serialization formats used alongside Jinja2 templates.

Answer

Proprietary binary core dump format

Answer

Raw bitmap image (.bmp) format

Answer

Windows executable (.exe) format

Question 6

In a CI/CD pipeline configured for Junos network changes, which THREE automated testing steps are typically performed before production deployment? (Choose three)

Accepted Answer

Static code linting of YAML data and Jinja2 templates. Pipelines typically include syntax validation, schema validation, and dry-run commit checks.

Answer

Physical replacement of router power supply units

Answer

Manual approval of physical fiber patch cables by a security guard

Question 7

When interacting with Junos devices via NETCONF, which TWO RPC operations are part of standard NETCONF protocol capabilities? (Choose two)

Accepted Answer

. NETCONF standard operations include , , , , etc.

Answer

<reboot-routing-engine-force>

Answer

<format-hard-drive>

Answer

<traceroute-packet>

Question 8

Which TWO tools or platforms are commonly used for version control and hosting of Junos automation code repositories? (Choose two)

Accepted Answer

GitHub. Git is the standard version control system, hosted on platforms like GitHub or GitLab.

Answer

Adobe Photoshop

Answer

Microsoft Word

Answer

VLC Media Player

Question 9

Which THREE principles are foundational to the DevOps movement when applied to network engineering? (Choose three)

Accepted Answer

Continuous monitoring and feedback loops for network telemetry. Foundational DevOps principles include automation, continuous feedback, culture/collaboration, and transparency.

Answer

Strict siloing of operational teams from software developers

Answer

Relying solely on annual manual network audits

Question 10

Which TWO advantages does structured telemetry and data streaming offer over traditional SNMP polling in Junos automation? (Choose two)

Accepted Answer

High granularity and real-time visibility into operational state. Streaming telemetry provides real-time push-based data with high granularity, avoiding the polling overhead of SNMP.

Answer

Requiring all network devices to run Windows Server OS

Answer

Mandatory requirement for analog dial-up modems

Answer

Elimination of all network interfaces

Question 11

In a Git repository managing Junos configurations, which TWO files or directories are typically added to the '.gitignore' file to prevent sensitive or temporary files from being tracked? (Choose two)

Accepted Answer

Local IDE configuration folders and temporary build output directories. .gitignore should exclude temporary build files, secret key files, and IDE-specific settings.

Answer

Core YANG data models provided by Juniper

Answer

Master branch commit history logs

Answer

Standard production Jinja2 templates (.j2)

Question 12

When writing Python automation scripts for Junos using PyEZ, which THREE objects or methods are commonly used for device interaction and configuration management? (Choose three)

Accepted Answer

Config (from jnpr.junos.utils.config) to handle configuration transactions. PyEZ uses Device for connections, Config for configuration management, and Fact for system information.

Answer

Microsoft_Excel_Workbook for direct spreadsheet parsing

Answer

Kernel_Panic_Trigger to deliberately crash the router

Question 13

Which TWO benefits are provided by implementing automated CI/CD pipelines for Junos network changes? (Choose two)

Accepted Answer

Standardized, repeatable validation and testing of every change before production. CI/CD provides faster delivery, automated error checking, reduced manual toil, and consistent deployments.

Answer

Elimination of network routing protocols like OSPF

Answer

Immediate physical replacement of broken optical transceivers by robots

Answer

Guaranteed 100% uptime regardless of fiber cuts

Question 14

Which THREE mechanisms are valid methods for authenticating and establishing a NETCONF session with a Junos device? (Choose three)

Accepted Answer

Remote RADIUS or TACACS+ AAA server integration via SSH transport. NETCONF on Junos runs over SSH, supporting SSH keys, username/password, and AAA integration.

Answer

Anonymous guest access without credentials

Answer

Unencrypted cleartext Telnet on TCP port 23

Question 15

When executing a configuration commit in Junos via NETCONF, which TWO commit parameters or modifiers can be specified in the RPC? (Choose two)

Accepted Answer

Check-only validation (verifying syntax without activating the configuration). NETCONF commit options on Junos include confirmed commits, check-only validation, log messages, etc.

Answer

Direct packet capture on port 0

Answer

Instant kernel bypass switching

Answer

Format hard disk partition primary