Working TCP/IP fundamentals — can explain what a subnet mask, gateway, DHCP scope, DNS resolution and a default route actually do, and troubleshoot with ping, tracert/traceroute, ipconfig/ip a, and nslookup/dig.
Hands-on configuration of at least a few of: router/firewall, managed switch, VLANs, wireless access points, VPN.
Comfort at a command line — Windows and at least basic Linux, and SSH into a device.
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5+ years of experience in DevOps, Site Reliability Engineering (SRE), Platform Engineering, Systems Engineering, or a similar infrastructure-focused role, with strong hands-on experience designing, operating, and troubleshooting production cloud infrastructure.
Strong production experience with AWS, including services such as EC2, VPC, IAM, S3, load balancing, auto scaling, and related cloud services.
Strong hands-on experience designing, deploying, and operating Kubernetes environments.
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