CISSP Practice полностью

The other three choices are not vulnerable to hackers. Redundant communication links can include two T-1 connections or the backup link. Multiple network service providers (NSPs) and the Internet service providers (ISPs) providing a robust and reliable service from their core networks. Redundant network connecting devices such as routers, switches, and firewalls can create high availability.

5. Regarding BCP and DRP, which of the following IT platforms typically provide some inherent level of redundancy?

a. Mainframe systems

b. Distributed systems

c. Desktop computers

d. Websites

5. b. Distributed systems use the client-server relationship model to make the application more accessible to users in different locations, and they rely extensively on LAN and WAN connectivity. Because all data resides at a company’s headquarters location and is replicated to the local sites, the distributed system provides some inherent level of redundancy. The other three choices cannot provide that kind of redundancy.

6. Which of the following IT contingency solutions provides recovery time objectives (RTOs) ranging from minutes to several hours?

a. Synchronous mirroring

b. Asynchronous shadowing

c. Single location disk replication

d. Multiple location disk replication

6. a. Disk replication can be implemented locally or between different locations. Disk replication techniques are classified as synchronous or asynchronous. With synchronous mirroring, the recovery time objectives (RTOs) can be minutes to several hours (for shorter time periods), and hence should be used for applications that can accept little or no data loss. With asynchronous shadowing, the RTO can range from several hours to a day (for longer time periods), depending on the time that is required to implement the changes in the unapplied logs. Disk replication involves two different disks to ensure that two valid copies of the data are always available.

7. The IT operations management of KPQ Corporation is concerned about the reliability and availability data for its four major, mission-critical information systems that are used by business end-users. The KPQ corporate management’s goal is to improve the reliability and availability of these four systems in order to increase customer satisfaction both internally and externally. The IT operations management collected the following data on downtime hours that include scheduled maintenance hours and uptime hours for all these systems. Assume 365 operating days per year and 24 hours per day for all these systems. The KPQ functional management thinks that the security goal of availability is more important in ensuring the continuity of business operations than the confidentiality and integrity goals. This is because the availability goal will ensure timely and reliable access to and use of system-related data and information, as it is an indicator of quantity of service. System Downtime, hours Uptime, hours 12008,56021508,61032508,51041008,660

Which of the following systems has the highest availability in a year expressed in percentages and rounded up?

a. System 1

b. System 2

c. System 3

d. System 4