Practical network engineering
Learn Cisco, BGP and network security the way it works in production.
Step-by-step guides, labs and troubleshooting notes for CCNA, CCNP, routing, firewalls and automation. Written for engineers who want to understand the why, not just paste commands.
Latest guides
Stream of Knowledge
BGP
October 30, 2026
1. Opening Customer onboarding often produces three different prefix lists: what the customer says it owns, what an IRR says it will announ...
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Stream of Knowledge
BGP
October 28, 2026
1. Opening Internet Routing Registries exist so operators can publish routing-policy information in a structured form. That information can...
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Stream of Knowledge
BGP
October 28, 2026
1. Opening Routers do not normally crawl the global RPKI repositories themselves. A relying-party validator validates signed objects and ex...
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Stream of Knowledge
BGP
October 24, 2026
1. Opening RPKI Route Origin Validation answers a narrow but powerful question: is the origin AS in this BGP route authorized by the addres...
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Stream of Knowledge
BGP
October 23, 2026
1. Opening Traditional route-leak prevention relies on operators correctly encoding business relationships in policy. RFC 9234 adds a machi...
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