Which of the following is a passive attack to a network?

A.
Message modification

B.
Masquerading

C.
Denial of service

D.
Traffic analysis

Explanation:
The intruder determines the nature of the flow of traffic (traffic analysis) between defined hosts and is able to
guess the type of communication taking place. Message modification involves the capturing of a message and
making unauthorized changes or deletions, changing the sequence or delaying transmission of captured
messages. Masquerading is an active attack in which the intruder presents an identity other than the original
identity. Denial of service occurs when a computer connected to the lnternet is flooded with data and/or
requests that must be processed.