In Windows-based environments, Server Message Block, or SMB, is the primary protocol used for file sharing, printer sharing, and access to network shares. SMB commonly uses TCP port 445 for direct hosting over TCP/IP. Therefore, the correct answers are SMB and port 445. This matches the CompTIA Network+ N10-009 objectives related to common networking protocols, ports, and their purposes.
Port 21 is associated with FTP, which is used for file transfer but is not the standard protocol for Windows network shares. Port 443 is used by HTTPS, which secures web traffic using TLS. HTTPS can be used for web-based file access portals, but it is not the normal protocol used by Windows clients to access shared folders such as \\server\share. SMB specifically supports Windows file sharing functions, including authentication, permissions, folder browsing, and file transfer across a local network. Because SMB relies on TCP port 445 in modern Windows networks, the best two answers are C and E.
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