Zonal Defending (again!)

Ok, it seems there is much uncertainty over exactly what the players roles are and what "zones" they command.
So I'll play the silly fucker and ask the following questions:
1. What zone does the keeper look after?
2. What zone is assigned to each defender?
3. Do the zones cross over into other zones?
4. Who's zone was Rooney in last night when he was standing for the free header?
Its just that it used to be easy to say "Fuck sake, Boyata should have been marking him..."
Not any more...
Answers greatly appreciated, then we can actually get to the bottom of who exactly is responsible instead of wildly pointing the finger when a lot of us don't fully get who is supposed to be doing what?
So I'll play the silly fucker and ask the following questions:
1. What zone does the keeper look after?
2. What zone is assigned to each defender?
3. Do the zones cross over into other zones?
4. Who's zone was Rooney in last night when he was standing for the free header?
Its just that it used to be easy to say "Fuck sake, Boyata should have been marking him..."
Not any more...
Answers greatly appreciated, then we can actually get to the bottom of who exactly is responsible instead of wildly pointing the finger when a lot of us don't fully get who is supposed to be doing what?