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43. Automatic file restoration requires which of the following?

a. Log file and checkpoint information

b. Access file and check digit information

c. Transaction file and parity bit information

d. Backup file and checkpoint information

43. a. Automatic file restoration requires log file and checkpoint information to recover from a system crash. A backup file is different from a log file in that it can be a simple copy of the original file whereas a log file contains specific and limited information. The other three choices do not have the log file capabilities.

44. Which of the following is the most common type of redundancy?

a. Cable backup

b. Server backup

c. Router backup

d. Data backup

44. d. In general, redundancy means having extra, duplicate elements to compensate for any malfunctions or emergencies that could occur during normal, day-to-day operations. The most common type of redundancy is the data backup, although the concept is often applied to cabling, server hardware, and network connectivity devices such as routers and switches.

45. Increasing which one of the following items increases the other three items?

a. Reliability

b. Availability

c. Redundancy

d. Serviceability

45. c. Reliability minimizes the possibility of failure and availability is a measurement of uptime while serviceability is a measure of the amount of time it takes to repair a problem or to restore a system following a failure. Increasing redundancy increases reliability, availability, and serviceability.

46. Which of the following is often overlooked in building redundancy?

a. Disks

b. Processors

c. Electrical power

d. Controllers

46. c. Redundant electric power and cooling is an important but often overlooked part of a contingency plan. Network administrators usually plan for backup disks, processors, controllers, and system boards.

47. Network availability is increased with which of the following?

a. Data redundancy

b. Link redundancy

c. Software redundancy

d. Power redundancy

47. b. Link redundancy, due to redundant cabling, increases network availability because it provides a parallel path that runs next to the main data path and a routing methodology that can establish an alternative path in case the main path fails. The other three redundancies are good in their own way, but they do not increase network availability. In other words, there are two paths: a main path and an alternative path.

48. What does an effective backup method for handling large volumes of data in a local-area-network environment include?

a. Backing up at the workstation

b. Backing up at the file server

c. Using faster network connection

d. Using RAID technology

48. b. Backing up at the file server is effective for a local-area network due to its greater storage capacity. Backing up at the workstation lacks storage capacity, and redundant array of independent disks (RAID) technology is mostly used for the mainframe. Using faster network connection increases the speed but not backup.

49. Network reliability is increased most with which of the following?

a. Alternative cable

b. Alternative network carrier

c. Alternative supplies

d. Alternative controllers

49. b. An alternative network carrier as a backup provides the highest reliability. If the primary carrier goes down, the backup can still work. The other three choices do provide some reliability, but not the ultimate reliability as with the alternative network carrier.

50. In a local-area network environment, which of the following requires the least redundancy planning?

a. Cables

b. Servers

c. Power supplies

d. Hubs