Junos Automation Stack And DevOps Concepts practice questions

Structured data formats take up less memory on the Junos Routing Engine hard drive.

Why wrong: File size is not the primary driver; programmability and parsing reliability are.

They eliminate the need to authenticate when connecting via NETCONF or gRPC.

Why wrong: Authentication is still strictly required regardless of data format.

They automatically convert all IPv4 addresses to IPv6 format.

Why wrong: Structured formats do not alter IP address versions.

Writing custom Python scripts that use regex to parse 'show route' outputs on the fly.

Why wrong: Parsing CLI output with regex is screen scraping, which is brittle and not IaC.

Manually logging into each router via SSH during a maintenance window to type out policy-options statements.

Why wrong: Manual CLI entry is the opposite of Infrastructure as Code.

Using dynamic routing protocols like BGP to automatically advertise prefixes without human intervention.

Why wrong: BGP is a control-plane routing protocol, not Infrastructure as Code.

Immutable infrastructure deployment where devices are replaced rather than updated manually.

Why wrong: While infrastructure as code can lead to immutability, the primary principle of config-as-code is versioning and declarative state.

Compiling the network CLI commands into binary machine code before executing them on Junos devices.

Why wrong: Junos configurations remain text-based or structured data (XML/JSON/YAML) and are not compiled into binary.

Automating the complete removal of the command-line interface in favor of graphical topology builders.

Why wrong: DevOps and network automation still rely heavily on APIs and CLI via automation tools, not necessarily eliminating the CLI.

Continuous Deployment stage

Why wrong: Continuous deployment pushes verified changes automatically to production without manual gating.

Continuous Monitoring stage

Why wrong: Monitoring happens post-deployment to ensure network health and telemetry tracking.

Infrastructure Provisioning stage

Why wrong: Provisioning is the initial setup of hardware or VM instances, not configuration validation.

To compile YAML files into Junos microcode for the Packet Forwarding Engine.

Why wrong: Junos does not compile user data files into PFE microcode.

To automatically execute unit tests against live BGP peering sessions.

Why wrong: Linters check static file syntax and style, not live BGP sessions.

To encrypt sensitive passwords stored within plaintext configuration files.

Why wrong: Encryption is handled by tools like Ansible Vault or SOPS, not standard linters.

Reboot the Junos routing engine to clear the Git repository cache and force a fast-forward merge.

Why wrong: Junos routing engine reboots have no effect on Git version control merge operations.

Run the 'git force-merge' command to automatically discard the older branch's changes.

Why wrong: No such command as 'git force-merge' exists.

Use 'git reset --hard' on the remote repository to delete both conflicting branches entirely.

Why wrong: Resetting hard destroys work and does not resolve merge conflicts collaboratively.

The Junos CLI pipe filter 'match' command

Why wrong: Pipe filters are for manual CLI text manipulation.

Proprietary screen-scraping CLI scripts running in a crontab daemon

Why wrong: Screen-scraping is legacy and non-model-driven.

The physical console cable attached to the Routing Engine

Why wrong: A console cable provides manual CLI access, not a model-driven automation interface.

The SNMP trap notification daemon running on port 162

Why wrong: SNMP is an asynchronous monitoring and management protocol, not a transactional configuration mechanism.

The <rollback> RPC with an explicit configuration revision number

Why wrong: Rollback reverts to a previously committed configuration, not transaction validation.

The 'cli -s' force-override flag in an SSH execution session

Why wrong: This is a CLI construct, not a NETCONF feature.

Creating a separate permanent branch for every physical router in the network and never merging them.

Why wrong: This creates unmaintainable branch drift and violates DRY (Don't Repeat Yourself) principles.

Locking the master branch for 12 months while developing a single monolithic configuration update offline.

Why wrong: This is waterfall methodology, contrary to CI/CD and DevOps.

Using tag-based releases exclusively without utilizing any version control branches.

Why wrong: Tags point to specific commits on branches; they do not replace branch management.

The Git repository automatically rejects the push citing syntax errors.

Why wrong: Git stores text files and does not evaluate Jinja2 syntax natively.

Junos automatically ignores the missing variable and applies default factory settings.

Why wrong: Junos devices do not process Jinja2 templates directly; templates are rendered on the automation server.

The target Junos router enters rescue mode due to corrupted NETCONF RPC messages.

Why wrong: Rendering errors happen on the controller before NETCONF messages are even built.

The local Junos shell (sh) utility

Why wrong: The local shell runs UNIX commands, not NETCONF.

Wireshark packet analyzer

Why wrong: Wireshark is a packet capture and analysis tool.

Junos Space Network Management Platform GUI

Why wrong: Junos Space is a management platform, not a Python-based NETCONF tool.

It compresses the configuration database to save NVRAM storage space.

Why wrong: Compression is unrelated to transactional atomicity.

It allows the router to dynamically rewrite Python scripts into C++ for faster execution.

Why wrong: Atomic transactions do not involve code rewriting.

It automatically backs up the entire Junos OS image to an external TFTP server.

Why wrong: OS image backups are separate from configuration transactions.

To encrypt all configuration payloads using AES-256 before transport.

Why wrong: Encryption relates to security, whereas idempotency relates to execution safety and state consistency.

To ensure that every script execution generates a completely random new configuration to test device resilience.

Why wrong: Randomness is undesirable in network configuration management.

To force the Junos Routing Engine to reboot every time a script is executed.

Why wrong: Rebooting is disruptive and defeats the purpose of safe automation.

FTP

Why wrong: FTP is used for file transfers.

Syslog

Why wrong: Syslog is used for asynchronous log message delivery.

Telnet

Why wrong: Telnet is an insecure, unstructured CLI protocol.

git history --routing-policy

Why wrong: No such Git command exists.

git diff --author

Why wrong: git diff compares trees or commits, not file-level line history by author.

git status --verbose

Why wrong: git status shows the working tree status, not historical line changes.

Siloing network operations strictly away from software development teams.

Why wrong: DevOps breaks down silos between teams.

Eliminating all documentation in favor of verbal communication.

Why wrong: Documentation as code is a key pillar of DevOps.

Relying entirely on manual change approval boards for every minor configuration change.

Why wrong: DevOps aims to streamline change management through automated testing rather than slow manual boards.

git add

Why wrong: git add stages changes.

git push

Why wrong: git push uploads local commits to a remote repository.

git save

Why wrong: git save is not a standard Git command.

Production traffic shedding

Why wrong: Traffic shedding is a mechanism for handling congestion, not testing.

Static code linting

Why wrong: Linting checks file syntax, whereas running a virtual device executes functional tests.

Hardware refactoring

Why wrong: Hardware refactoring refers to physical component changes.

It encrypts the communication channel between the client and the Junos device.

Why wrong: Encryption is handled by SSH/TLS transport layers.

It acts as a firewall filter blocking unauthorized IP addresses on the management interface.

Why wrong: Firewall filters handle packet filtering, not data modeling.

It compiles Python scripts into executable machine code for the Routing Engine CPU.

Why wrong: Schemas do not compile Python code.

Because Junos devices do not accept authentication strings longer than 8 characters.

Why wrong: Junos supports much longer authentication strings.

To prevent Jinja2 rendering engines from running out of memory.

Why wrong: Memory issues are unrelated to secret management.

To ensure that NETCONF sessions always default to unencrypted plain text.

Why wrong: NETCONF runs securely over SSH.