I am afraid I do not know too much about cyberwarfare to answer your questions. Furthermore, this is a thread for strategic and nuclear weapons, not cyberwarfare. Perhaps you could find a thread here dedicated to cyberwarfare to ask your questions. Just to give an answer to your questions:Can you please answer for my knowledge
1. Can you please elaborate how cyber attacks against India can be successful? They keep on saying that they have the sophisticated network structure.
2. In past, we have also seen cyber capabilities of a developed countries like China, Japan, US, Russia can can easily destroy the opponent and can create a lot of damage in terms of information and network breach. But never heard that China did any cyber attack or any thing you have on this?
1) I don't really know how China would cyber-attack India. Most Indians would boast of their great IT security. Except for one Indian defence analyst: Pravin Sawhney. He describes in multiple youtube videos how India lags China in this field, and is so vulnerable. Whether he is a credible source, remains to be seen.
2) Confirmed destructive cyber attacks have so far been done by US and Israel on Iran's nuclear processing facilities. Chinese cyber attacks are never confirmed not denied. But I do think that there is some hint of truth with the alleged F-35 technology hacking done by China on Lockheed Martin. It probably explains the sudden Chinese advancement in stealth fighter design. China is no. 2 in that field all of a sudden, overtaking experienced aircraft makers in Russia and Europe by quite a margin. Just my opinion.