JUNIPER NETWORKSBeing replacedJuniper Networks Certified Associate, Junos
The Juniper Networks Certified Associate, Junos (JNCIA-Junos) certification validates your understanding of the core functionality of the Junos OS, from networking fundamentals to routing policy and firewall filters. Designed for networking professionals with beginner-intermediate knowledge, it serves as the baseline for multiple Juniper certification tracks, including Enterprise and Service Provider Routing and Switching. Earning this credential demonstrates you have the foundational skills to configure, monitor, and troubleshoot Junos devices.
827 practice questions · Updated 2026-07-30
7Domains
45Objectives
265Concepts
827Questions
JN0-105 Curriculum
Every domain, objective, and concept the JN0-105 exam measures.
- Definition of Collision Domain
- Definition of Broadcast Domain
- Impact of Hubs on Collision Domains
- Impact of Switches on Collision Domains
- Impact of Switches on Broadcast Domains
- Impact of Routers on Broadcast Domains
- Impact of VLANs on Broadcast Domains
- Relationship Between Collision and Broadcast Domains
- Calculating Number of Collision and Broadcast Domains
- Router Functions
- Switch Functions
- Router vs. Switch Comparison
- Ethernet frame structure
- MAC addressing
- Ethernet switching basics
- VLANs
- Link aggregation
- Ethernet standards and speeds
- Layer 2 Addressing
- Layer 3 Addressing
- Address Resolution
- IPv4 Address Structure
- IPv4 Address Classes
- IPv4 Subnetting
- IPv4 Private and Public Addresses
- IPv4 Special Addresses
- IPv6 Address Structure
- IPv6 Address Types
- IPv6 Address Representation
- IPv6 Prefix and Subnetting
- IPv6 Special Addresses
- IPv4 and IPv6 Coexistence
- IPv4 Subnet Mask
- Subnet Mask Notation
- Subnetting Fundamentals
- Subnet Address Calculation
- Subnetting in Practice
- Binary Number System Basics
- Decimal Number System Basics
- Binary-to-Decimal Conversion Method
- Practice with Conversion Examples
- Longest-Match Routing Principle
- Prefix Length and Specificity
- Route Lookup Process
- Default Route and Longest Match
- Practical Implications
- CoS Fundamentals
- CoS Components
- CoS Configuration
- CoS Verification
- Identify network protocol types
- Understand unicast protocols
- Understand broadcast protocols
- Understand multicast protocols
- Junos OS Architecture Overview
- Control Plane Functions
- Forwarding Plane Functions
- Junos Kernel and Processes
- Routing Engine (RE)
- Packet Forwarding Engine (PFE)
- Junos Data Flow
- Junos CLI and Management Interfaces
- Control Plane vs. Forwarding Plane
- Control Plane Functions
- Forwarding Plane Functions
- Junos Architecture
- Packet Forwarding Engine (PFE)
- Routing Engine (RE)
- Kernel and Forwarding Table
- Junos Processes
- Graceful Restart and Nonstop Routing
- Impact of Control Plane Failure
- Routing Engine functions
- Packet Forwarding Engine functions
- Separation of control and data planes
- Interactions between Routing Engine and Packet Forwarding Engine
- Transit Traffic Flow
- Ingress Processing
- Route Lookup and Forwarding Decision
- Egress Processing
- PFE and Packet Forwarding
- ASIC and Hardware Acceleration
- Transit vs. Local Traffic
- Traceroute and Transit Path Verification
- Exception Traffic Overview
- Types of Exception Traffic
- Junos Packet Forwarding Engine (PFE) Handling
- Routing Engine (RE) Processing
- Rate Limiting and Policing
- Firewall Filters for Exception Traffic
- Loopback Filtering
- Management Protocols and Exception Traffic
- Troubleshooting Exception Traffic
- Accessing CLI Help
- Command Completion
- Command Abbreviation
- Help Topics
- CLI Help for Configuration Mode
- CLI Help for Operational Mode
- Understanding Output Filtering
- Using the 'match' Option
- Using the 'except' Option
- Combining Filters
- Filtering with 'find' and 'count'
- Active vs. Candidate Configuration
- Configuration Database
- Editing the Candidate Configuration
- Committing the Candidate Configuration
- Configuration Rollback
- Configuration Check
- Understanding configuration reverting
- Using the rollback command
- Rollback to specific configuration versions
- Understanding configuration loading
- Using the load command
- Load override, merge, and replace modes
- Verifying loaded configuration
- Committing loaded configuration
- J-Web Interface Overview
- Accessing J-Web
- J-Web Dashboard
- Configuration Management in J-Web
- Monitoring with J-Web
- J-Web Troubleshooting Tools
- J-Web User Roles and Permissions
- Factory-Default Configuration
- Loading Factory-Default Configuration
- Rescue Configuration Overview
- Saving a Rescue Configuration
- Loading a Rescue Configuration
- Deleting a Rescue Configuration
- Verifying Rescue Configuration Status
- User Accounts
- Login Classes
- Configuring User Accounts
- Authentication Methods
- Configuring Authentication
- Interface Types
- Interface Configuration
- Configuration Groups Overview
- Using Configuration Groups
- NTP Fundamentals
- NTP Configuration on Junos
- NTP Verification and Troubleshooting
- SNMP Overview
- SNMP Configuration on Junos
- SNMP Verification and Troubleshooting
- Syslog Fundamentals
- Syslog Configuration on Junos
- Syslog Verification and Troubleshooting
- Logging Overview
- Log Management and Archival
- Configuration Archival Overview
- Archival Configuration Methods
- Archival File Management
- Show Commands Overview
- Common Show Commands
- Monitor Commands Overview
- Common Monitor Commands
- Command Output Filtering
- Command Output Formatting
- Interface Statistics Overview
- Monitoring Interface Statistics
- Common Interface Errors
- Error Impact on Performance
- Clearing Interface Statistics
- ping
- traceroute
- telnet
- ssh
- monitor traffic
- show interfaces
- show route
- show log
- Junos OS Installation Methods
- Junos OS Upgrade Process
- Junos OS Downgrade Process
- Junos OS Package Management
- Junos OS Activation and Validation
- Junos OS Recovery Procedures
- Power Management Overview
- Power Monitoring Commands
- Power Configuration Options
- Troubleshooting Power Issues
- Root Password Recovery Overview
- Accessing the Boot Loader
- Boot Options for Recovery
- Single-User Mode Procedure
- Clearing the Root Password
- Rebooting and Verifying
- Platform-Specific Variations
- Packet Forwarding Overview
- Route Lookup Process
- Forwarding Table vs Routing Table
- Next-Hop Resolution
- Load Balancing
- Filter-Based Forwarding
- Routing table structure
- Forwarding table structure
- Route selection process
- Routing table vs forwarding table
- Viewing routing and forwarding tables
- Route preference definition
- Default route preference values
- Lower preference is preferred
- Modifying route preference
- Route preference vs. metric
- Effect of preference on route selection
- Routing Instances Overview
- Types of Routing Instances
- Configuration of Routing Instances
- Routing Instance Tables
- Route Leaking Between Instances
- Verification of Routing Instances
- Static route configuration
- Static route verification
- Static route next-hop options
- Static route preference and metric
- Static route failover and floating static routes
- Static route recursive resolution
- Definition of Dynamic Routing Protocols
- Advantages of Dynamic Routing Protocols
- Disadvantages of Dynamic Routing Protocols
- Comparison with Static Routing
- Use Cases for Dynamic Routing
- Default routing policy behavior
- Default import and export policies
- Effect of default policies on route advertisement
- Understanding routing policy basics
- Defining import policies
- Defining export policies
- Applying policies to protocols
- Using policy match conditions
- Using policy actions
- Understanding policy evaluation order
- Modifying route attributes in policies
- Testing and verifying policies
- Policy evaluation flow overview
- First-match semantics
- Default actions
- Term structure and evaluation
- Impact of actions on flow
- Policy structure
- Terms in a policy
- Match conditions
- Actions
- Policy evaluation flow
- Match criteria in routing policy
- Actions in routing policy
- Match criteria in firewall filters
- Actions in firewall filters
- Firewall filter overview
- Filter match conditions
- Filter actions
- Filter terms and ordering
- Applying firewall filters
- Filter verification and troubleshooting
- RPF Overview
- RPF Modes
- RPF Configuration
- RPF Verification
- RPF Failure Scenarios
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Percentages reflect share of the current practice bank, not official exam weightings — no structured per-skill weight is published for JN0-105, so none is invented.