Changed C1000-162 Exam Questions

In QRadar, when performing a search in the My Offenses or All Offenses tabs, valid values for the Offense Type field include "Any" and "Source IP". "Any" searches all offense sources, while "Source IP" allows for searching offenses with a specific source IP address​​.

Here's why this is the most effective approach:

False Positive Reduction: The goal is to stop legitimate traffic from triggering offenses. This requires fine-tuning the rules generating those offenses.

Building Blocks: Rules are housed within building blocks in QRadar's hierarchical rule structure. The Custom Rules Editor is the tool to modify them.

Event-Based Tuning: The optimal approach is to target the specific event that's causing the false positives, making the solution more precise.

Challenges in Search Performance: When dealing with large volumes of data in QRadar, searches can become slow if the data is not indexed properly. To improve search performance, specific property types can be utilized.

Property Types Overview:

Tabled Properties: Refer to data stored in tabular format but do not inherently improve search performance.

Indexed Properties: Properties that have an index created for them, significantly speeding up search operations by allowing quick lookups.

Stored Properties: Simply refers to properties that are stored but not necessarily indexed.

Common Properties: General properties used across various rules and searches but do not improve search performance specifically.

Importance of Indexed Properties: Indexed properties are specifically designed to enhance search performance by creating an index that allows QRadar to quickly locate the data without scanning the entire dataset.

Reference Confirmation: According to IBM QRadar documentation, using indexed properties is the recommended approach to reduce data volume searched and to shorten search times, making them the best choice for improving search performance.

References:

IBM QRadar documentation on optimizing search performance highlights the use of indexed properties to enhance search efficiency.

Specificity: The question states that the addresses are specifically IPv6-formatted. Using the 'IPv6' type ensures precision in the reference set.

IP Matching by QRadar: QRadar's rule engine will properly match against IPv6 addresses when the reference set type is 'IPv6'.