I think that if the targeted sanctions are very direct and effective, then they could be used to respond to cyber attacks. Cyber attacks grow every day because there is a big business around them and you can perform them all around the world. Sanctions can help to respond and stop them.
Yes, targeted sanctions can be used effectively to respond to cyber attacks, because all actions are targeted sanctions. Targeted sanctions allow the government to penalize those responsible. It is no different than any other type of law enforcement, that seeks to target those who are accused. Targeted sanctions are easily put in place through the electronic capability of the internet.
Targeted sanctions can be used to effectively respond to cyber attacks. Some internet attacks are easy to trace back to their beginnings, and if the government could figure out where the attack began, they can use sanctions on that country with the stipulation that the sanction would be lifted if the cyber attacks stop.
Targeted sanctions would do nothing to stop cyber attacks under normal circumstances. In reality, stopping a cyber attack in progress isn't as easy as it sounds. Such sanctions would slow hackers, but a skilled hacker could easily find a way around such a sanction. They cause more trouble than they're worth, and better responses are available.
Targeted sanctions should not be used to effectively respond to cyber attacks. As yet however there have been no cases of cyber warfare but there have been increasing problems with cyber-attacks in a peace time situation. I think the government should not attempt to control the Internet or be placing any restrictions upon it.