Mark works as a Network Administrator for NetTech Inc. The company has a Windows 2000 domain-based network. Users report that they are unable to log on to the network. Mark finds that accounts are locked out due to multiple incorrect log on attempts. What is the most likely cause of the account lockouts? 

Answer options:

A. Spoofing
B. Brute force attack
C. SYN attack
D. PING attack

account if the number of failed logon attempts occur within a specified period of time, based on the security policy lockout settings. Answer: A is incorrect.

Brute force attack is the most likely cause of the account lockouts. In a brute force attack, unauthorized users attempt to log on to a network or a computer by using multiple possible user names and passwords. Windows 2000 and other network operating systems have a security feature that locks a user Spoofing is a technique that makes a transmission appear to have come from an authentic source by forging the IP address, email address, caller ID, etc. In IP spoofing, a hacker modifies packet headers by using someone else`s IP address to hide his identity. However, spoofing cannot be used while surfing the Internet, running on the TCP/IP protocol. It is a protocol-level attack that can render a computer`s network services unavailable. A SYN attack is also known as SYN