Final answer:
An intrusion detection system (IDS) is responsible for logging and monitoring who is on or trying to access an organization's network. It differs from a firewall in its specific purpose to detect unauthorized attempts to compromise a network. Biometrics and electronic vaulting serve different security functions and are not associated with network monitoring.
Step-by-step explanation:
The system that logs and monitors who is on or trying to access an organization's network is the intrusion detection system (IDS). The purpose of an IDS is to detect unauthorized access or attempts to compromise a computer system. It achieves this by monitoring network traffic and analyzing it for signs of suspicious activity based on predefined rules or heuristics. An IDS is different from a firewall, which acts as a barrier to control traffic between networks based on predetermined security rules.
Biometrics are used for identifying and authenticating individuals based on physical characteristics, and electronic vaulting involves the secure transfer of data to an offsite location for backup. While these are important security measures, they do not specifically monitor network access in the way an IDS does.