Final answer:
Port 137 is commonly associated with the NetBIOS service, which allows computers to communicate over a local network.
Step-by-step explanation:
The service commonly associated with port 137 is NetBIOS. NetBIOS stands for Network Basic Input/Output System and is a protocol that allows computers to communicate over a local network. Port 137 is used specifically for NetBIOS name service, which is responsible for registering and resolving computer names on a network.
NetBIOS provides services for tasks such as file sharing, printer sharing, and accessing network resources. It is commonly used in Windows-based networks. Other services mentioned in the options, such as NTFS (which stands for New Technology File System, a file system used by Windows), snmpd (Simple Network Management Protocol daemon), and nbstat (a utility used to display NetBIOS over TCP/IP statistics), are not directly associated with port 137.