Ports 137 and 139 are associated with NetBIOS/NetBT services. Port 137 is used by NetBIOS for name resolution services, allowing machines on a local network to find each other by name, whereas port 139 is used for session services, facilitating communication between computers. Even though port 135 is also used for RPC Endpoint Mapper, it's not directly related to NetBIOS/NetBT services, and 445 is reserved for Microsoft-DS (Directory Services) over SMB, which facilitates file sharing without the NetBIOS layer.
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