Are you planning to take the Security+ exam? If so, make sure you understand common attacks. As an example, see if you can answer this sample question.
Q. An IDS alerts on increased traffic. Upon investigation, you realize it is due to a spike in network traffic from several sources. Assuming this is malicious, what is the MOST likely explanation?
A. A smurf attack
B. A flood guard attack
C. A DoS attack
D. A DDoS attack
You can see the answer and explanation here.