Which of the following TCP ports is used by the Windows OS for file sharing?
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A. B. C. D.C.
The TCP port used by the Windows operating system for file sharing is port 445.
This port is used by the Server Message Block (SMB) protocol, which is the protocol used by Windows for file and printer sharing over a network.
SMB is also used for remote administration, communication between processes on a network, and other services.
Port 53 is used for DNS (Domain Name System) traffic, which resolves domain names to IP addresses.
Port 389 is used by LDAP (Lightweight Directory Access Protocol), which is used for directory services such as authentication and access control.
Port 1433 is used by Microsoft SQL Server, which is a relational database management system used to store and retrieve data as requested by other software applications.
Therefore, the correct answer is C. 445.