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…

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

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. 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, chatting on-line, etc. because

forging the source IP address causes the

responses to be misdirected.

Answer C is incorrect. A SYN attack affects computers 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 flooding.

Answer D is incorrect. When a computer repeatedly sends ICMP echo requests to another computer,

it is known as a PING attack.