The London network administrator informs you that there is no WAN
connectivity. ISDN connectivity has been lost between London and San
Jose. After some investigation you contact the San Jose administrator.
Based on logs maintained in San Jose, there has not been a successful
ISDN session since yesterday when a security audit was performed.
Though International Travel Agency (ITA) does not rely on sensitive “topsecret”
information, the database of customer information has to be kept
confidential. Also, the integrity of the reservation systems is mission-critical.
Partners and customers need access to information, but the ability to modify
information must be restricted and monitored....