Data Abstraction Layer — Learn free

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Questions 1–10 of 10

1. What is a Data Abstraction Layer (DAL)?
Question 1A. A physical storage device that holds all application dataB. A reporting tool that summarises data for managersC. A network layer that routes data between serversD. A layer of code that keeps the tricky details of how data is stored or used separate from the rest of the softwareE. A backup process that copies data to a second site
2. In a Data Abstraction Layer, what does Abstraction mean?
Question 2A. Removing data that is no longer neededB. Hiding the complicated details of storing data behind a simpler way of working with itC. Compressing data to reduce its sizeD. Encrypting data so it cannot be readE. Summarising data into charts
3. How does a Data Abstraction Layer support Separation of Concerns?
Question 3A. By storing each department's data in a separate databaseB. By assigning a different developer to each tableC. By splitting the software into front-end and back-end teamsD. By encrypting data separately from the applicationE. By separating how data is stored from how the software works, making the software easier to understand and look after
4. What does the Consistent Interface of a Data Abstraction Layer provide?
Question 4A. A set of clear rules the rest of the software follows to work with the data, so it keeps running smoothly even if storage changesB. A single user screen for viewing all dataC. A guarantee that data is never modifiedD. A common colour scheme across applicationsE. A fixed hardware configuration for the database
5. How does the Adaptability of a Data Abstraction Layer help when the way data is stored changes?
Question 5A. The whole application must be rewrittenB. The data must be migrated back to the old formatC. Only the Data Abstraction Layer needs to be adjusted and the rest of the software can stay the sameD. The change is blocked until every module is updatedE. The application switches to read-only mode
6. What does a Data Abstraction Layer do in terms of Security and Validation?
Question 6A. It issues passwords to usersB. It makes sure data is handled in a safe and controlled wayC. It scans the network for intrudersD. It backs up data every hourE. It anonymises all personal data automatically
7. Using what can a Data Abstraction Layer be built in real life?
Question 7A. Spreadsheets and macrosB. Tape drives and object storageC. Firewalls and routersD. APIs or special frameworksE. Printed documentation
8. How are APIs described in the context of a Data Abstraction Layer?
Question 8A. A set of rules for talking to a systemB. A place where data is physically storedC. A type of database indexD. A tool for drawing diagramsE. A licence for using software
9. How do frameworks help developers in the context of a Data Abstraction Layer?
Question 9A. They automatically write all the application codeB. They replace the need for a databaseC. They enforce a single programming languageD. They provide free cloud storageE. They let developers work with objects in the software without worrying too much about the underlying details
10. Which of these is NOT one of the listed characteristics of a Data Abstraction Layer?
Question 10A. AbstractionB. AdaptabilityC. CompressionD. Separation of ConcernsE. Consistent Interface