Juniper JNCIA-Junos (JN0-105)

Many network teams inherit Juniper gear alongside other vendors, and the risk is not routing theory. It is engineers applying habits from other platforms to Junos and causing avoidable outages. This course helps IT Directors and Team Leads close that gap before staff make production changes.

Role fit: The course suits network administrators and IT practitioners who support or are moving to Juniper devices. The first four skills cover network structure, Ethernet, IPv4 subnetting, and IPv6. Experienced engineers can skip them, and junior staff can use them to build a base. The core skills cover the Junos architecture, the CLI, base configuration, interfaces, routing, route policies, firewall filters, and device operations.

Risk and change control: Instruction focuses on safe change practices:

• Using commit confirmed and rollback to reverse bad changes
• Using firewall filters to restrict inbound SSH management access to a management VLAN

Multi-vendor reality: A dedicated OSPF deep dive configures Cisco and Juniper devices side by side and verifies that neighbor adjacencies form. This matches the mixed environments most teams run.

Time investment: Plan for about 15 hours of video across 15 skills, plus hands-on lab time. The instructor shows how teams can practice with Juniper hardware or software images.

The course is delivered as a CBT Nuggets Playlist aligned to the JN0-105 objectives, which Juniper replaced with JN0-106 on 5 April 2026. Skill checks help Team Leads gauge readiness before learners schedule a certification exam.

IT teams complete this training to run Juniper gear with confidence in production, including in the mixed-vendor networks most organizations operate. Instructors demonstrate on physical EX-series hardware and virtual Junos images. Teams see how commands behave on real switches and practice safely in emulated labs before touching production.

• Faster recovery from bad changes: Team members learn the candidate configuration workflow and how to reverse changes when something goes wrong. A misconfiguration becomes a controlled recovery task instead of an extended outage.
• Reliable multi-vendor routing: Engineers configure static and dynamic routing, then deploy OSPF on both Cisco and Juniper routers. They verify neighbor adjacencies and route exchange, and understand OSPF timing behavior such as hello and dead intervals.
• Tighter device access control: Practitioners build firewall filters for real use cases, such as allowing SSH to a device's loopback only from the management VLAN. This reduces exposure of management interfaces.
• Quicker troubleshooting: Teams use show system, show chassis, and the monitor command to watch traffic and statistics in real time. They learn how traffic moves between the Routing Engine and the Packet Forwarding Engine, so they can isolate problems sooner.

The result for IT Directors is a team that understands how Junos handles networking differently from other platforms. That foundation prepares them for specialist-level Juniper work.

Knowledge

• How network models, Ethernet, and IPv4/IPv6 addressing fit together to move data across a network
• How Junos separates the control plane (Routing Engine) from the forwarding plane (Packet Forwarding Engine), and how transit traffic is handled
• How Junos candidate and active configurations, configuration hierarchy, and commit workflow help manage device changes
• How Junos selects best paths using longest-match prefixes and route preferences across connected, static, and dynamic routes
• Core OSPF concepts (neighbor adjacencies, LSAs, areas) and how OSPF works in a multi-vendor Juniper and Cisco environment
• How route policies handle redistribution and how firewall filters are read and applied

Ability

• Navigate operational and configuration modes in the Junos CLI using context-sensitive help, tab completion, and hierarchy commands
• Build a Junos base configuration with set commands and configure interfaces and IP addressing
• Design and analyze IPv4 subnets for new or expanded network segments
• Configure static routing and OSPF on Junos, then validate adjacencies and routes with ping and show commands
• Read firewall-filter configuration and explain how Junos applies filter terms to traffic
• Monitor and maintain Junos devices with show system, show chassis, and monitor commands, and manage changes through the Junos commit workflow