Q18: An attacker may use automatic brute forcing tool to compromise your a) username b) employee ID C) system / PC name d) password Explain: Q19: The attacker will use different bots (zombie PCs) to ping your system and the name of the attack is a) Distributed Denial-of-Service (DDoS) b) Permanent Denial-of-Service (PDoS) c) Denial-of-Service (D05) d) Controlled Denial-of-Service (CDoS) Explain: Q20: Digital signature provides a) authentication b) nonrepudiation c) both (a) and (b) d) neither (a) and (b) Explain