Modern Communication

Not a home work problem anyway.

I think Discussions are meant for getting the best answer.

And Sometimes it's curiosity rather than home work...

And sometimes Modern Communication breaks down due to language.

The way you have written the question in English, it is vague and ambiguous. You are using broad terms that could mean a great number of things. Does 'Modern Communication' mean Internet traffic? IP-based Telephones, Cable TV, Flashing a signal mirror at the next mountain peak over (this is a method still used to this day, so it is 'modern' in one sense of the word).

You have unfortunately run into a common pitfall for non-native English speakers on this site; your broken English leads to a vague question, which is mistaken for a 'do my homework for me' question. Those questions are typically responded to with humorous comments as helpful as the question is specific.

I know English is a hard language to learn if you have not been brought up in it, but if you can put a little more detail in your questions, and be able to use terms that are not so broad in meaning, you'll find this to be a very helpful and useful site.