There are two related reasons why you have earned a 24 hour vacation from the burden of posting here.
First, you are asking some very basic and trivial questions about death knight mechanics that anyone who has played a death knight would know. Even just finishing the starting area and getting to level 58 in Stormwind or Orgrimmar would be enough experience for you to be able to answer these questions for yourself. Instead of trying things out for yourself in-game, or reading the guides or thread discussions, or asking your questions in the "simple questions" thread, you jumped right into a high end theorycrafting discussion about a class you haven't played and don't know anything about. I know all of this, not because I'm psychic, but because you list "night elf druid" in your character profile.
Second, your night elf druid profile is broken. There is no character with that name on that realm. We don't allow anonymous posting here, fix your profile or your ban will become permanent.