Final answer:
Option D, Spoofing, is NOT a Denial-of-Service attack. It is a technique used to falsify identity data such as the IP address but not an attack itself; the other options listed are all types of DoS attacks.
Step-by-step explanation:
The student's question pertains to identifying which option listed is NOT a Denial-of-Service attack. Let's briefly define each term to ascertain the correct answer:
- Teardrop: A DoS attack that involves sending fragmented packets to a target device, intending to crash the system by exploiting fragmentation reassembly vulnerabilities.
- Smurf: This DoS attack floods the victim with traffic by exploiting Internet Control Message Protocol (ICMP) and the broadcast addressing to amplify the volume of traffic.
- Ping of Death: An attack that involves sending packets larger than the maximum allowed size, causing an overflow of buffers and leading to system crashes.
- Spoofing: This is a technique used in many cyberattacks but, by itself, is not a Denial-of-Service attack. Spoofing involves masquerading as a different entity by falsifying data, such as the IP address.
Based on these definitions, the correct answer is D. Spoofing. It is not specifically a Denial-of-Service attack but rather a method that can be used in various types of cyberattacks, including but not limited to DoS attacks.