Which attack is characterized by traffic coming from multiple sources to disrupt a service?

The identification of the attack characterized by traffic coming from multiple sources to disrupt a service is indeed the Distributed Denial of Service (DDoS) Attack. A DDoS Attack targets a service by overwhelming it with a flood of traffic from multiple compromised systems, often part of a botnet. This orchestrated barrage exceeds the capacity of the target's server or network, rendering the service unavailable to legitimate users. The distributed nature of the attack — originating from numerous sources instead of just one — makes it particularly difficult to mitigate, as it creates a challenge for defenses to identify legitimate requests amid the large volume of malicious traffic.

In contrast, a standard Denial of Service (DoS) Attack typically comes from a single source, which can simplify detection and mitigation. Other options, such as Man-in-the-Middle attacks and Session Hijacking, focus more on intercepting or manipulating communications rather than overwhelming a service to disrupt availability. Thus, the DDoS Attack stands out for its specific strategy of using multiple attacking sources to achieve its goal of service interruption.