This three-day, advanced-level course provides network engineers with advanced skills to diagnose and resolvencomplex failures on devices running HPE Networking Junos OS. Using a consistent lab environment based onnthe XYZ Corporation network, students troubleshoot realistic fault scenarios across switching, routing, MPLS, security, and multicast domains. The course covers a broad range of technologies, including Ethernet switching, Ethernet VPN–Virtual Extensible LAN (EVPN-VXLAN) IP fabrics, OSPF, IS-IS, BGP, MPLS Layer 3 VPNs (L3VPNs), stateful firewall security, SRX chassis clusters, site-to-site and remote access IPsec VPNs, application security, multicast, and class of service (CoS). Each topic follows a structured troubleshooting methodology that students can apply to production networks.

Through instructor-led scenarios and hands-on labs, students develop systematic troubleshooting workflows and gain practical experience isolating and fixing root causes. This course is based on Junos OS Release 25.2R1.8.

• Troubleshoot Ethernet switching.
• Troubleshoot a data center IP fabric.
• Troubleshoot OSPF routing.
• Troubleshoot IS-IS routing.
• Troubleshoot BGP routing.
• Troubleshoot route oscillation and routing loops.
• Troubleshoot MPLS networks.
• Troubleshoot stateful firewall security.
• Troubleshoot SRX chassis clusters.
• Troubleshoot IPsec VPNs.
• Troubleshoot remote access VPNs.
• Troubleshoot AppSecure services.
• Troubleshoot multicast networks.
• Troubleshoot CoS.

DAY 1

Introduction to the course network

• Explain the headquarters data center network
• Discuss the service provider network
• Describe the remote branch office network
• Describe the capabilities of the Junos MCP server
• Lab 01: Examining the lab network

Troubleshooting Ethernet switching

• Diagnose and repair common Ethernet switching problems
• Lab 02: Troubleshooting Ethernet switching

Troubleshooting a data center IP fabric

• Troubleshoot the EVPN-VXLAN IP fabric in the headquarters data center
• Lab 03: Troubleshooting the headquarters IP fabric

Troubleshooting OSPF

• Troubleshoot OSPF adjacencies in a single-area network
• Troubleshoot OSPF routing in a multi-area network
• Lab 04: Troubleshooting OSPF

Troubleshooting IS-IS

• Troubleshoot IS-IS adjacencies
• Troubleshoot IS-IS routing in a multi-area network
• Lab 05: Troubleshooting IS-IS

DAY 2

Troubleshooting BGP

• Troubleshoot BGP adjacencies
• Troubleshoot BGP routing
• Lab 06: Troubleshooting BGP

Troubleshooting route oscillation and routing loops

• Diagnose and repair route oscillations and routing loops
• Lab 07: Troubleshooting route oscillations and routing loops

Troubleshooting MPLS

• Diagnose and repair MPLS Layer 3 VPN services
• Lab 08: Troubleshooting MPLS

Troubleshooting stateful firewall security

• Diagnose and repair security problems on a stateful firewall
• Lab 09: Troubleshooting stateful security

Troubleshooting chassis clusters

• Diagnose and repair out-of-band cluster management
• Diagnose and repair fabric link issues
• Diagnose and repair data plane issues
• Lab 10: Troubleshooting SRX chassis clusters

DAY 3

Troubleshooting IPsec VPNs

• Diagnose and repair IPsec tunnel failures
• Diagnose and repair IPsec tunnel connectivity
• Lab 11: Troubleshooting IPsec VPNs

Troubleshooting remote access VPNs

• Diagnose and repair remote access VPN issues
• Lab 12: Troubleshooting remote access VPNs

Troubleshooting application security

• Diagnose and repair problems implementing application security
• Lab 13: Troubleshooting application security

Troubleshooting multicast

• Diagnose and repair problems with multicast networks
• Lab 14: Troubleshooting multicast

Troubleshooting class of service

• Explain the CoS topology
• Diagnose and repair CoS-based IPsec VPNs
• Diagnose and repair CoS problems within the service provider network
• Lab 15: Troubleshooting class of service
• SELF-STUDY MODULES

Junos OS troubleshooting commands

• Examine helpful Junos OS troubleshooting commands

The primary audience for this course includes:

• Network engineers responsible for operating and maintaining HPE Networking Junos Operating System devices in enterprise or service provider environments.
• Network engineers who diagnose and resolve complex failures across routing, switching, MPLS, and
  security domains.
• Individuals preparing for the Juniper Networks Certified Internet Specialist (JNCIS) or higher
  certification tracks.

Completion of the Junos Intermediate Routing and Junos Troubleshooting courses, or equivalent experience:

• Working knowledge of OSPF, IS-IS, and BGP configuration and operation on Junos OS
• Working knowledge of Ethernet switching, VLANs, and aggregated Ethernet on HPE Networking EX switches
• Familiarity with SRX firewalls, including security zones, security policies, and the Junos OS flow module
• Understanding of MPLS and L3VPN concepts is recommended but not required