Describe what a pre-processor does in a network-based IDS tool such as Snort. Demonstrate your understanding of this functionality by citing two examples of pre-processors and explaining what function they serve in the process of network traffic analysis and intrusion detection.
Additional information
The problem related to Computer Science and it explains about what a pre-processor does in a network-based IDS tool such as Snort and demonstrate this with two examples.
Word limit: 125