C Programming, Embedded Linux, Dns, Nat, DHCP, Iptables, Vpn, metrics, Icmp, Traffic classification, RFCs related to routing, Ip, Firewall Exposure, System diagnostics, Debugging encrypted traffic paths, standards compliance, protocols, Linux networking Stack, policy rules, netfilter, Linux VPNs, cryptography basics, Routing tables, packet analysis, nftables, Marking