Which of the following attacks involves the use of previously captured network traffic?

A.
Replay

B.
Smurf

C.
Vishing

D.
DDoS

Explanation:
Replay attacks are becoming quite common. They occur when information is captured over a network. A replay
attack is a kind of access or modification attack. In a distributed environment, logon and password information
is sent between the client and the authentication system. The attacker can capture the information and replay it
later. This can also occur with security certificates from systems such as Kerberos: The attacker resubmits the
certificate, hoping to be validated by the authentication system and circumvent any time sensitivity.
If this attack is successful, the attacker will have all of the rights and privileges from the original certificate. This
is the primary reason that most certificates contain a unique session identifier and a time stamp. If the
certificate has expired, it will be rejected and an entry should be made in a security log to notify system
administrators.