I think it also depends on which section of consumer you are talking about and that too in which geographic location. For example, a general consumer in the USA will be different than a general consumer in Nigeria. 
Having said that let's say if we assume that we are talking about global audience from 16 to 56 years of age those who use ( or familiar ) with the internet. I think they know a little bit about digital. Since digital payment, digital campaigns, digital this or that are in the news all the time. But for specific terms like IoT, I don't think there is the good audience who know about it. However, the funny thing is they do use IoT in their daily life but they do not realize this. I think IoT is still an academic word. 
Sometimes people do not know the technology or they don't have to. They only care about the product. For example today even an average investor knows about Bitcoin. But still, there is the huge group of audience who doesn't know about Blockchain! 

New generations of consumers, especially Millennials and Generation Y, are very familiar with al these: they simply grow into it!

The other amazing insight is that no matter where they are, geographically or from a socio-economic point of view, they speak the same language, use the same acronyms- the virtual language is pretty consistent across different cultures.

the best way to find data to support this is to look at digital penetration around the world.

There is literature on millennials widely available, which I can dig up for you if helpful.

I don't have any statistical data on this, just my personal experience after 10 years working on digital. As Giulia said, millennials grow into it and they speak the same language but to me their knowledge is limited to some aspects. When switching to more technical digital area I think that consumers' skills are still quite limited (e.g. try to ask anyone about criptocurrency, security or the dark web, I don't think you could get something in most of the cases)

Can I ask why are you asking this question and what is your hypothesis behind it. It is very interesting question you are asking but i wanted to understand where you are going with this question.
please advise,