netsh (Network Shell) is a command-line scripting utility built into Windows that lets you configure and inspect virtually every aspect of networking from a terminal — no GUI required. It operates through a context hierarchy: you enter a context like…
When a port is unreachable, a service is not responding, or something is holding a connection open, netstat is the first command to run. It shows exactly what is listening on which port, which connections are established, which processes own…
OpenSSL is the standard command-line toolkit for working with certificates, keys, and SSL As a system administrator, you will use it to generate private keys, createcertificate signing requests, issue self-signed certificates, and convert between certificateformats. This guide covers the full…
Complete IPv4 and IPv6 subnetting reference. Subnet masks, CIDR notation, binary breakdown, private ranges, VLSM examples, and key formulas.
