I am planning on taking the CLD exam soon. To what detail must one know ActiveX, .NET, Networking, Accessing External Code (The code interface node)? After looking at the sample exam on NI's website, I had a feeling that the test was more focussed on the fundamentals and design patterns.
The example exam is probably a realistic look at the expectations. The exam is graded on three aspects, functionality (does it work to the design requirement), technique (big sequence structures would probably not be a good idea), and style (clean looking diagrams, etc. as described in the style guides on NI's site). There also was a thread a few days ago about the CLA exam that had some stuff possibly relevant to this exam.
Putnam Certified LabVIEW Developer
Senior Test Engineer North Shore Technology, Inc. Currently using LV 2012-LabVIEW 2018, RT8.5