Tarlogic Denial of Service Tests (DoS) is a professional security testing service that simulates DoS and DDoS attacks against internet-exposed systems in controlled environments. The service tests the saturation levels of various services by simulating attacks from single or multiple IP addresses to evaluate system resilience and resource capacity. The testing methodology involves launching progressively demanding tests to identify the point at which system resources become saturated, whether network bandwidth, processing capacity, or memory. Tests are typically conducted during off-peak hours to minimize impact on production workloads. The service provides load testing data for internet-exposed services, measures response times of contracted security services during attacks, validates backend system resilience and autoscaling capabilities, and identifies application vulnerabilities that could facilitate DoS attacks. For DDoS simulation, the service uses distributed servers with multiple IP addresses and BGP paths to replicate realistic attack scenarios, as controlling actual botnets is illegal. The testing covers both network-based DoS attacks that target infrastructure resources and software vulnerability-based DoS attacks that exploit application weaknesses. The service helps organizations understand their defensive capabilities against resource exhaustion attacks and verify the effectiveness of their DoS mitigation solutions.