AP CSP Fault Tolerance and Redundancy
36 flashcards covering AP CSP Fault Tolerance and Redundancy for the AP-CS-PRINCIPLES Big Idea 4 section.
Fault tolerance and redundancy are critical concepts in computer science, particularly in ensuring systems remain operational despite failures. According to the College Board's AP Computer Science Principles Curriculum Framework, these concepts fall under Big Idea 4, which emphasizes the importance of reliable systems in computing. Fault tolerance refers to the ability of a system to continue functioning even when one or more components fail, while redundancy involves duplicating critical components to provide backup in case of failure.
On practice exams and competency assessments, questions about fault tolerance and redundancy often require students to analyze scenarios where system failures occur and determine how redundancy mitigates these issues. Common traps include confusing redundancy with unnecessary duplication or misunderstanding the implications of a single point of failure. Students may also overlook the cost-benefit analysis of implementing redundancy, leading to an incomplete understanding of its practical application.
A key tip to remember is that redundancy should be balanced with efficiency; excessive redundancy can lead to increased costs and complexity without significantly improving reliability.
Terms (36)
- 01
What is fault tolerance in computing?
Fault tolerance is the ability of a system to continue operating properly in the event of the failure of some of its components. It ensures reliability and availability of services despite failures (College Board AP CED).
- 02
How does redundancy contribute to fault tolerance?
Redundancy enhances fault tolerance by providing backup components or systems that can take over in case of a failure, thus minimizing downtime and data loss (College Board AP CED).
- 03
What is the primary purpose of a backup system?
The primary purpose of a backup system is to create copies of data to ensure that it can be restored in case of data loss or corruption (College Board AP CED).
- 04
Which of the following is an example of redundancy in a network?
An example of redundancy in a network is having multiple routers that can route traffic in case one fails, ensuring continuous network availability (College Board AP CED).
- 05
What is the role of error detection in fault tolerance?
Error detection plays a crucial role in fault tolerance by identifying errors in data transmission or processing, allowing for corrective actions to be taken before failure occurs (College Board AP CED).
- 06
Define failover in the context of fault tolerance.
Failover is the process of switching to a redundant or standby system, component, or network upon the failure of the currently active system, ensuring continued operation (College Board AP CED).
- 07
How often should backup systems be tested for effectiveness?
Backup systems should be tested regularly to ensure they function correctly and can restore data when needed, typically at least once a year (College Board AP CED).
- 08
What is the significance of data replication in fault tolerance?
Data replication involves copying data across multiple locations or systems to ensure its availability and durability in case of a failure, enhancing fault tolerance (College Board AP CED).
- 09
Under what circumstances is load balancing used?
Load balancing is used when distributing workloads across multiple computing resources to ensure no single resource is overwhelmed, which helps maintain system performance and fault tolerance (College Board AP CED).
- 10
What is a common method for implementing redundancy in data storage?
A common method for implementing redundancy in data storage is through RAID (Redundant Array of Independent Disks), which combines multiple disks to improve data reliability and performance (College Board AP CED).
- 11
What is the purpose of a disaster recovery plan?
A disaster recovery plan outlines procedures to recover and protect a business IT infrastructure in the event of a disaster, ensuring business continuity and minimizing downtime (College Board AP CED).
- 12
Which of the following best describes a hot standby system?
A hot standby system is fully operational and continuously updated, ready to take over immediately in case of a primary system failure, ensuring minimal disruption (College Board AP CED).
- 13
What is the difference between active and passive redundancy?
Active redundancy involves multiple components working simultaneously, while passive redundancy has backup components that are inactive until needed, providing different levels of fault tolerance (College Board AP CED).
- 14
When implementing fault tolerance, what is the first step?
The first step in implementing fault tolerance is to identify critical components and potential failure points within the system to ensure appropriate redundancy measures are in place (College Board AP CED).
- 15
What is the role of checksums in fault tolerance?
Checksums are used to verify the integrity of data during transmission or storage, helping to detect errors and ensuring that data remains accurate and reliable (College Board AP CED).
- 16
How does a distributed system enhance fault tolerance?
A distributed system enhances fault tolerance by spreading resources across multiple locations, so if one part fails, others can continue functioning, providing resilience (College Board AP CED).
- 17
What is the maximum allowed downtime for critical systems according to best practices?
Best practices suggest aiming for zero downtime for critical systems, but acceptable limits may vary based on organizational needs and risk assessments (College Board AP CED).
- 18
What is a cold standby system?
A cold standby system is a backup system that is not operational until it is needed, requiring manual intervention to activate, which can lead to longer recovery times (College Board AP CED).
- 19
How often should data backups be performed for optimal fault tolerance?
Data backups should be performed regularly, with frequency determined by the criticality of the data and the organization's operational needs, often daily or weekly (College Board AP CED).
- 20
What is the significance of system monitoring in fault tolerance?
System monitoring is significant in fault tolerance as it allows for the early detection of issues, enabling proactive maintenance and minimizing the impact of potential failures (College Board AP CED).
- 21
What is the function of a load balancer in a fault-tolerant system?
A load balancer distributes incoming network traffic across multiple servers to ensure no single server becomes a bottleneck, enhancing performance and reliability (College Board AP CED).
- 22
What does the term 'mean time to recovery' (MTTR) refer to?
Mean time to recovery (MTTR) refers to the average time required to restore a system or service after a failure, a key metric in evaluating fault tolerance strategies (College Board AP CED).
- 23
Define the term 'single point of failure.'
A single point of failure is a component whose failure would lead to the failure of the entire system, highlighting the need for redundancy to avoid such vulnerabilities (College Board AP CED).
- 24
When should a system undergo a fault tolerance assessment?
A system should undergo a fault tolerance assessment during the design phase and periodically thereafter to identify and mitigate potential risks (College Board AP CED).
- 25
What is the benefit of using cloud services for fault tolerance?
Using cloud services for fault tolerance allows for scalable resources and automatic failover capabilities, enhancing reliability without significant capital investment (College Board AP CED).
- 26
What is the role of virtualization in enhancing fault tolerance?
Virtualization allows multiple virtual instances to run on a single physical server, providing flexibility and redundancy that enhances fault tolerance (College Board AP CED).
- 27
What is RAID 1 and how does it contribute to fault tolerance?
RAID 1 is a disk mirroring technique that duplicates data across two or more disks, ensuring data availability even if one disk fails (College Board AP CED).
- 28
What is the impact of network redundancy on system performance?
Network redundancy can improve system performance by providing alternative paths for data, reducing congestion and ensuring continuous availability (College Board AP CED).
- 29
How does a failback process work in fault tolerance?
The failback process involves returning operations to the primary system after it has been restored, ensuring a smooth transition back to normal operations (College Board AP CED).
- 30
What is the importance of documentation in fault tolerance strategies?
Documentation is important in fault tolerance strategies as it provides clear guidelines for recovery processes, ensuring that personnel can respond effectively during failures (College Board AP CED).
- 31
What is the purpose of a failover cluster?
A failover cluster is a group of independent servers that work together to increase availability by ensuring that if one server fails, another can take over (College Board AP CED).
- 32
What is the role of redundancy in data centers?
Redundancy in data centers ensures that critical systems remain operational during failures by providing backup power, cooling, and networking systems (College Board AP CED).
- 33
What is a hot site in disaster recovery planning?
A hot site is a fully functional off-site facility that can take over operations immediately after a disaster, minimizing downtime (College Board AP CED).
- 34
How does a distributed database enhance fault tolerance?
A distributed database enhances fault tolerance by storing copies of data across multiple locations, allowing continued access even if one site fails (College Board AP CED).
- 35
What is the significance of testing failover systems?
Testing failover systems is significant to ensure they function correctly and can handle actual failure scenarios, validating the effectiveness of fault tolerance measures (College Board AP CED).
- 36
What is the difference between synchronous and asynchronous replication?
Synchronous replication occurs in real-time, ensuring data is consistently updated across systems, while asynchronous replication allows for delays, which can impact recovery times (College Board AP CED).