Overview of computer networking concepts and professional interview preparation for technical roles, such as Network Engineer, Network Designer, and Automation Engineer. The technical content systematically explains fundamental topics like the OSI model, IP addressing (IPv4/IPv6), and core network devices like routers, switches, and firewalls, often presented in a beginner-to-expert question-and-answer format. Additionally, the sources detail advanced topics such as SDN (Software-Defined Networking), BGP (Border Gateway Protocol), and MPLS (Multiprotocol Label Switching), while also offering practical advice on network troubleshooting methodologies and securing networks using technologies like VPNs and WPA3 encryption. Finally, several excerpts focus on recruitment strategies and the types of challenging technical and behavioural questions candidates should expect in high-level interviews, particularly concerning network design and automation skills.