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
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.
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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.
An EX3400 Virtual Chassis that shows a missing member after a reboot, or splits into two masters, is one of the most-searched EX-series problems. Here is how split-and-merge works and the command path to recover cleanly.
Configure Juniper SRX hub-and-spoke IPSec VPNs to Azure and AWS: IKEv2, route-based VPNs, BGP over IPsec, NAT-Traversal and routing-instance separation.
Every Juniper engineer hits the 'configuration database locked' error eventually. Here is how to find who holds the lock, clear a stale one, and understand exclusive vs private configuration mode.
The Juniper KB and community threads about a reth showing down while its member physical interfaces are up almost always end at LACP or cluster redundancy-group state. Here is the full diagnosis path with the exact show commands.
Master Junos MX Class-of-Service: classifiers, forwarding classes, schedulers, rewrite rules and hierarchical CoS for voice, video and bulk-data traffic shaping.