NAPALM gives network engineers one Python API across Cisco, Arista, and Juniper — normalized getters plus config diff, commit, and rollback for safe multi-vendor automation.
Netmiko makes router SSH automation easy: send_command with TextFSM parsing, send_config_set for changes, save_config, enable mode, and fleet-wide pushes with error isolation.
Drive a real SSH session to a router from Python with Paramiko — exec_command vs invoke_shell, disabling paging, handling auth failures, and a reusable connect-and-run helper.
Build a TCP port reachability checker with Python's socket module — connect_ex, timeouts, DNS resolution, and a management-plane service audit across a device list.