Deep dives into cybersecurity, observability, and modern infrastructure
How a LAN actually works under the hood: Ethernet frame format, MAC address structure (OUI, multicast bit, locally-administered bit), why switches replaced hubs, the switch learning algorithm with a worked example, ARP, ARP spoofing, MAC flooding, and broadcast storms.
Read ArticleHow TDMA, FDMA, and CDMA partition the channel, how ALOHA, CSMA, CSMA/CD, and CSMA/CA share it, with a worked Ethernet binary exponential backoff and the Wi-Fi RTS/CTS answer to hidden terminals. Plus interference vs jamming.
Read ArticleOpening post of a new Link Layer series. Build CRC from first principles: polynomial division over GF(2), a fully worked example, the generator polynomials inside Ethernet, Wi-Fi, USB and PPP, and what CRC guarantees plus what it doesn't.
Read ArticleExpert-level BGP: Route refresh capabilities, AS-set aggregation, allowas-in, backdoor routes, prevent transit AS, unsuppress-map, advanced route reflectors, and MPLS Layer 3 VPN implementation.
Read ArticleAdvanced BGP topics: AIGP for IGP metric preservation, BGP communities for route tagging, sophisticated route maps for traffic engineering, and route dampening for network stability.
Read ArticleLearn how to build a complete ISP environment with BGP routing using FRRouting. Hands-on tutorial covering route reflection, iBGP/eBGP relationships, and production-grade routing configurations.
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