Which of the following is true of signature-based IDSes?

Signature-based Intrusion Detection Systems (IDSes) operate by comparing signatures of known threats against observed events to identify potential security breaches. These systems are based on a database of known threat signatures, which are distinctive patterns or anomalies associated with malicious activity. Signature-based IDSes are highly effective at detecting known threats but can struggle with zero-day attacks, which have not yet been documented or analyzed to create a corresponding signature. This method requires regular updates to the signature database to protect against new vulnerabilities and threats as they are discovered.