If I select the three transformers highlighted with arrows and create a custom transformer, how many input and output ports will it have by default?

• A. One Input and One Output port
• B. One Input and Two Output ports
• C. Two Input and Two Output ports
• D. Two Input and Three Output ports

Answer: (C)

When you create a Custom Transformer from existing components, the wrapper’s interface is defined by the needs of the pasted transformers. Specifically, the custom transformer exposes the maximum number of input ports and the maximum number of output ports required by any of the contained transformers. If the three highlighted transformers collectively require two separate input streams and can produce two separate output streams, the new custom transformer will show two input ports and two output ports by default. This makes sure upstream data can feed each needed input and each produced stream can be routed outward. If you need more later, you can adjust the ports inside the custom transformer, but by default the counts reflect those maximums inside.