A comprehensive, technical reference for network engineers.
Protocols, standards, and troubleshooting guides.
The physical and data link layer foundation. Frame structures, MAC addressing, media types, and Layer 1 troubleshooting.
Packet headers, addressing classes, CIDR subnetting, fragmentation, and MTU analysis.
Transport layer mechanics. Flow control, windowing, 3-way handshake state machines, and reliability.
OSPF, EIGRP, and BGP. Link-state algorithms, metric calculations, convergence, and route redistribution.
VLANs, 802.1Q tagging, Spanning Tree Protocol (STP/RSTP), and ARP tables.
ACLs, VPNs (IPsec/SSL), Firewalls, and 802.1X authentication standards.
Modern Leaf-Spine architectures, VXLAN overlays, EVPN control planes, and Software-Defined Networking (SDN).
Python (Netmiko/Nornir), Ansible Playbooks, REST APIs, JSON/YAML data models, and Infrastructure as Code (IaC).
MPLS Layer 3 VPNs, Label Switched Paths, BGP Route Targets, and the evolution to Application-Aware SD-WAN overlays.