| Azure VM & networking | Deploying and managing VMs; VNets, NSGs, UDRs, peering, Azure Firewall, Load Balancer, VPN Gateway, ExpressRoute; troubleshooting with Network Watcher |
| Linux networking | ip/iproute2, routing tables, iptables/nftables, VLANs, bridges, GRE/VXLAN tunnels, tcpdump, basic scripting (Bash or Python) |
| Routing protocols | Strong BGP (eBGP/iBGP, attributes, route maps, communities, path selection); OSPF; EIGRP/IS-IS exposure; static and policy-based routing |
| IPsec / VPN | IKEv1/IKEv2, site-to-site and route-based VPNs, crypto parameters, NAT-T, troubleshooting tunnel negotiation |
| SD-WAN | Hands-on with at least one platform (e.g. Cisco Catalyst SD-WAN, Fortinet, VMware VeloCloud, Versa); overlay, policies, application-aware routing (SLA-based path selection, DPI app identification), failover |
| 4G / 5G | Cellular WAN integration, APN configuration, signal metrics (RSRP, RSRQ, SINR), private APN and failover design; configuring and troubleshooting 4G/5G routers , dual-SIM failover |
| Wi-Fi | 802.11ac/ax, RF planning, site surveys, controller-based and cloud-managed WLANs, 802.1X/RADIUS |
| Core networking | TCP/IP, subnetting, VLANs, STP, NAT, DNS, DHCP, QoS, packet capture and analysis (Wireshark) |
| IDS/IPS & firewalls | IDS/IPS with Suricata or Snort (rule tuning, alert triage); next-gen firewall policy, NAT and UTM configuration (e.g. Fortinet, Palo Alto, pfSense/OPNsense) |
| OpenWrt | Configuring and hardening OpenWrt routers and firewalls: UCI, firewall zones (fw4/nftables), mwan3 multi-WAN, IPsec/WireGuard VPN, firmware upgrades and packages |