Which of the following is NOT a type of DoS attack?

A Ping Sweep is a network scanning technique used to determine which IP addresses in a specific range are active by sending ICMP Echo Request packets to the target IP addresses. It is primarily used for network management and troubleshooting purposes rather than as a method designed to disrupt or degrade service availability to a server or a network, which characterizes Denial of Service (DoS) attacks.

In contrast, the other options represent recognized forms of DoS attacks:

• A UDP Flood attack overwhelms the target with a high volume of UDP packets, consuming its bandwidth and resources.

• The SMURF attack leverages network amplification by sending ICMP requests to broadcast addresses, causing all devices on that subnet to reply to the spoofed target, effectively inundating it with traffic.

• A SYN Flood attack exploits the TCP connection process by sending a series of SYN requests without completing the handshake, which can overwhelm the target system's ability to respond to legitimate traffic.

Thus, the distinction lies in the intent and effect of the actions; a Ping Sweep does not aim to disrupt service, whereas the other options are specifically designed to do so.