212-89 Leak Questions

A Denial-of-Service (DoS) attack is characterized by flooding the network with a high volume of traffic to consume all available network resources, preventing intended or authorized users from accessing system, network, or applications. This type of attack aims to overwhelm the target ' s capacity to handle incoming requests, causing a denial of access to legitimate users. Unlike XSS (Cross-Site Scripting) attacks, URL manipulation, or SQL injection, which exploit vulnerabilities in web applications for unauthorized data access or manipulation, a DoS attack specifically targets the availability of services.

The data preprocessing step performed by Johnson, where he analyzes user activities within a certain time period to create time-ordered domain sequences for further analysis on sequential patterns, is known as user-specific sessionization. This process involves aggregating all user activities and requests into discrete sessions based on the individual user, allowing for a coherent analysis of user behavior over time. This is critical for identifying patterns that may indicate a watering hole attack, where attackers compromise a site frequently visited by the target group to distribute malware. User-specific sessionization helps in isolating and examining sequences of actions taken by users, making it easier to detect anomalies or patterns indicative of such an attack.

This scenario highlights recovery challenges specific to IoT environments, which are addressed in the ECIH Endpoint and IoT Incident Handling modules. IoT systems generate continuous streams of operational data, configuration states, and control commands that are essential for accurate recovery after disruption.

Option D is correct because maintaining synchronized cloud replicas of critical IoT resources ensures near-real-time availability of sensor data, device configurations, and control logic. ECIH emphasizes that traditional periodic backups are often insufficient for IoT and OT systems due to their dynamic and state-dependent nature. Cloud replication supports faster, more complete restoration and reduces data gaps.

Options A, B, and C rely on static or delayed backup mechanisms that cannot capture the operational state required to restore IoT systems accurately. Tape archives and external drives introduce latency and risk data loss, while ZIP archives lack synchronization.

ECIH recovery guidance stresses resilience and continuity, particularly for operational technology. Continuous replication is therefore the most effective strategy.

In the risk assessment process, " System characterization " is the initial step where the scope of the assessment is defined. This involves identifying and documenting the boundaries of the IT systems under review, the resources (hardware, software, data, and personnel) that constitute these systems, and any relevant information about their operation and environment. This foundational step is essential for understanding what needs to be protected and forms the basis for subsequent analysis, including identifying vulnerabilities, assessing potential threats, and determining the impact of risks to the organization.