Which of the following would constitute the best example of a password to use for access to a system by a network administrator? 

Answer options:

A. holiday
B. Christmas12
C. Jenny
D. GyN19Za!

D

GyN19Za! would be the the best answer because it contains a mixture of upper and lower case characters, alphabetic and numeric characters, and a special character making it less vulnerable to password attacks. All of the other answers are incorrect because they are vulnerable to brute force or dictionary attacks. Passwords should not be common words or names. The addition of a number to the end of a common word only marginally strengthens it because a common password attack would also check combinations of words: Christmas23 - Christmas123 - etc...