Hands-on Junos CLI tutorials, OSPF and BGP configuration guides, SRX firewall policies and step-by-step network troubleshooting — lab-tested by working network engineers preparing for JNCIA, JNCIS and beyond.
Latest Guide
'Input errors are climbing — is it the cable, the optic or the config?' Juniper KB and Reddit threads answer this constantly. Here is every counter in show interfaces extensive explained, with the isolation method that finds the guilty component.
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MAC learning storms of invalid addresses, packets flooded out every port, unknown-unicast floods — the Juniper community sees this EX-series problem weekly. The causes are usually one of four: a loop, silent P2P failures, asymmetric routing or a leaking device.
Locked out of an EX, SRX or MX because the root password is lost? Here is the official console recovery procedure — loader prompt, boot -s, recovery shell, new password and commit — plus what to do when it fails.
'How do I leak routes between two VRFs, or from a VRF to the global table?' is a standing question on the Juniper community. Rib-groups and instance-import solve different versions of the problem — here is when to use which, with working configs.
Step-by-step EVPN-VXLAN leaf configuration on EX3400 and EX4300 with QFX as spine, including IRB anycast, MAC learning and verification commands.
BGP stuck in Active or Connect means TCP never establishes. This guide covers the real-world causes from Juniper forums: missing routes, loopback peering without local-address, eBGP multihop, blocked TCP/179 and auth mismatch.
Juniper Mist AI expands APAC: new carrier-grade fabric for tier-1 telecom operators, Mist Cloud extended to Tokyo/Sydney, QFX and SRX updates and new AI WAN features.
A new Juniper admin posts 'my routes are not advertised to the neighbor' every week. Junos applies next-hop self differently than Cisco, and export policies have quirks of their own — here is the complete verification path.
OSPF neighbors stuck in ExStart is one of the most common Junos troubleshooting questions on the Juniper community. Most of the time it is an MTU mismatch — here is how to confirm it in 60 seconds and fix every other cause too.
A working JNCIA-Junos 6-week study plan: lab setup with vSRX/vMX, week-by-week tasks, free Juniper resources, exam strategy and what to memorize vs what to skip.