Which type of attack involves impersonating a user or a system?

Which type of attack involves impersonating a user or a system?
A .  Smurfing attack
B .  Spoofing attack
C .  Spamming attack
D .  Sniffing attack

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Answer: B

Explanation: A spoofing attack is when an attempt is made to gain access to a computer system by posing as an authorized user or system. Spamming refers to sending out or posting junk advertising and unsolicited mail. A smurf attack is a type of denial-of-service attack using PING and a spoofed address. Sniffing refers to observing packets passing on a network. Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3: Telecommunications and Network Security (page 77).