Final answer:
The BasicHttpBinding is a standard binding that can replace an existing ASMX web service. The WSHttpBinding and WCF Web HTTP Binding are also options, but may require modifications.
Step-by-step explanation:
The standard binding that could be used to replace an existing ASMX web service is the BasicHttpBinding. This binding is compatible with ASMX services and allows communication over HTTP. It is a simple and widely supported binding that can be used to develop and consume web services.
Another option is the WSHttpBinding, which provides support for more advanced features such as reliable messaging and transaction flow. However, it is important to note that the WSHttpBinding might require some modifications to the existing ASMX service to ensure compatibility.
Lastly, the WCF Web HTTP Binding can be used to create a RESTful service that replaces the ASMX web service. This binding is suitable for services that primarily communicate using HTTP verbs like GET, POST, PUT, and DELETE.