IBM C1000-156 Exam Questions

Tuning a building block in IBM QRadar SIEM V7.5 is primarily aimed at reducing the number of false positives. This process involves adjusting the rules and logic within the building block to better differentiate between normal and suspicious activity. Here's the detailed explanation:

False Positives: High numbers of false positives can overwhelm analysts and obscure genuine threats. Tuning helps in refining detection criteria to reduce these false alarms.

Rule Adjustments: Modifying the thresholds, conditions, and filters within the building block rules to ensure they more accurately reflect the environment's typical behavior.

Improved Accuracy: Enhanced precision in detecting true security incidents, thus improving the overall effectiveness of the SIEM solution.

Reference IBM QRadar SIEM administration guides and best practice documents emphasize the importance of tuning to minimize false positives, ensuring more actionable alerts.

When exporting a list of events to a CSV file in IBM QRadar SIEM V7.5, the default columns included in the search result typically are:

Log Source: The origin of the log data.

Event Count: The number of events.

High Level Category: The broad classification of the event.

Related Offense: The associated offense ID or description.

These columns provide a comprehensive overview of the events, helping analysts quickly understand the context and significance of the data.

Reference IBM QRadar SIEM documentation provides details on the default columns included in search results and their significance in event analysis.

To optimize event and flow payload searches for log data stored for up to a month, an administrator should configure the retention period for payload indexes. Here's the process:

Retention Period Configuration: Set the retention period for payload indexes to match the desired data storage duration (e.g., one month).

Improved Search Efficiency: By configuring the retention period appropriately, QRadar ensures that the indexed data is efficiently searchable, improving performance during searches.

Index Management: Regularly manage and clean up indexes to maintain optimal system performance and storage utilization.

Reference The IBM QRadar SIEM administration guides provide instructions on configuring retention periods for various types of indexes, including payload indexes, to optimize search performance.

The primary site for downloading software updates for IBM QRadar is IBM Fix Central. Here's how it works:

IBM Fix Central: A centralized platform for downloading fixes, updates, and patches for IBM software products.

Accessing Updates: Administrators can log in to IBM Fix Central, select QRadar from the list of products, and download the necessary updates.

Regular Updates: Keeping QRadar updated with the latest fixes and patches ensures optimal performance and security.

Reference IBM QRadar SIEM documentation and support resources direct users to IBM Fix Central for downloading and applying software updates.

When upgrading the IBM QRadar SIEM environment to patch a vulnerability, the recommended order for upgrading managed hosts is:

Console: Start by upgrading the Console, which is the central management point of the QRadar deployment.

Remaining Hosts: After the Console has been upgraded, proceed to upgrade the other managed hosts, including Event Processors, Flow Processors, and Data Nodes.

This order ensures that the management and coordination functionalities provided by the Console are updated first, minimizing the risk of compatibility issues during the upgrade process.

Reference IBM QRadar SIEM upgrade guides specify that the Console should be upgraded first, followed by the remaining managed hosts, to ensure a smooth and coordinated upgrade process.