Which of the following statements is/are true about Network Level Attack? i. This attack generally makes an attempt to either slowdown or completely bring to halt an computer network. ii. It can automatically lead to application level attack. iii. Virus can cause network level attack only.

An unauthorized user X sends too many login requests to a server Susing random user id's one after other in quick succession, so as to flood the network and deny the network access of all other legitimate users.