Recording the source IP address is vital for tracking the origin of network traffic and identifying potential unauthorized access attempts. Knowing where the traffic originates from can help determine if the access attempts are coming from within the organization's internal network, or if they are external threats. Without this information, it would be challenging to locate the source of the security threat and take appropriate actions. Timestamps alone are not enough because they do not provide information about where the access attempt originated. Usernames are important for access logs but are not directly related to network traffic. The amount of data transferred may be an indicator of exfiltration but is less specific to unauthorized access attempts.