If Susan discovers services on TCP and UDP 137-139 and TCP 445 and 1433, what type of server is she likely connecting to?

The identification of services associated with specific ports points strongly to a Windows SQL server. TCP/UDP ports 137-139 are typically linked to Windows networking services, specifically NetBIOS over TCP/IP, which facilitates network file and print sharing. TCP port 445 is associated with SMB (Server Message Block), which is crucial for sharing files, printers, and other network resources in Windows environments.

Moreover, TCP port 1433 is specifically designated for Microsoft SQL Server, indicating that Susan is likely connecting to a server that hosts a SQL database. The presence of this port alongside the others suggests that the server is primarily functioning as a database server in a Windows environment. The combination of services indicates a strong likelihood of a Windows SQL server rather than other options like a Linux server or a workstation, which would utilize different sets of services and ports.