SMB & NetBIOS Enumeration & Hardening

SMB is the file-and-print plumbing of almost every Windows network, and for most of its life it leaked to anyone who asked nicely. This covers what SMB and NetBIOS do, what an assessor pulls out of them with enum4linux-ng, smbclient, rpcclient and the nmap smb-* scripts, why NTLM relay turns a captured login into access without cracking anything, and how EternalBlue and SMBGhost fit at a concept level. Then the part that matters: detection and the few settings that shut the surface down.