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