CompTIA CompTIA Certifications DS0-001 Questions & Answers

• Question 31:

  Which of the following is used to hide data in a database so the data can only be read by a user who has a key?

  A. Data security

  B. Data masking

  C. Data protection

  D. Data encryption

  Correct Answer: D

  The option that is used to hide data in a database so the data can only be read by a user who has a key is data encryption. Data encryption is a process that transforms data into an unreadable or scrambled form using an algorithm and a key. Data encryption helps protect data from unauthorized access or modification by third parties, such as hackers, eavesdroppers, or interceptors. Data encryption also helps verify the identity and authenticity of the source and destination of the data using digital signatures or certificates. Data encryption can be applied to data at rest (stored in a database) or data in transit (transmitted over a network). To read encrypted data, a user needs to have the corresponding key to decrypt or restore the data to its original form. The other options are either different concepts or not related to hiding data at all. For example, data security is a broad term that encompasses various methods and techniques to protect data from threats or risks; data masking is a technique that replaces sensitive data with fictitious but realistic data to protect its confidentiality or compliance; data protection is a term that refers to the legal or ethical obligations to safeguard personal or sensitive data from misuse or harm. References: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.

• Question 32:

  A database's daily backup failed. Previous backups were completed successfully. Which of the following should the database administrator examinefirstto troubleshoot the issue?

  A. CPU usage

  B. Disk space

  C. Event log

  D. OS performance

  Correct Answer: C

  The first thing that the database administrator should examine to troubleshoot the issue is the event log. The event log is a file that records the events and activities that occur on a system, such as database backups, errors, warnings, or failures. By examining the event log, the administrator can identify the cause and time of the backup failure, and also check for any other issues or anomalies that may affect the backup process or the backup quality. The other options are either not relevant or not the first priority for this task. For example, CPU usage, disk space, and OS performance may affect the performance or availability of the system, but not necessarily cause the backup failure; moreover, these factors can be checked after reviewing the event log for more information. References: CompTIA DataSys+ Course Outline, Domain 5.0 Business Continuity, Objective 5.2 Given a scenario, implement backup and restoration of database management systems.

• Question 33:

  A database administrator is updating an organization's ERD. Which of the following is thebestoption for the database administrator to use?

  A. Word processor

  B. Spreadsheet

  C. UML tool

  D. HTML editor

  Correct Answer: C

  The best option for the database administrator to use to update an organization's ERD is a UML tool. A UML tool is a software application that allows users to create, edit, and visualize diagrams using the Unified Modeling Language (UML). UML is a standard language for modeling software systems and their components, such as classes, objects, relationships, behaviors, etc. UML can also be used to create entity relationship diagrams (ERDs), which are graphical representations of the entities (tables), attributes (columns), and relationships (constraints) in a database. A UML tool can help the administrator to update an organization's ERD by providing features such as drag-and- drop, templates, symbols, validation, etc. The other options are either not suitable or not optimal for this task. For example, a word processor is a software application that allows users to create and edit text documents; a spreadsheet is a software application that allows users to organize and manipulate data in rows and columns; an HTML editor is a software application that allows users to create and edit web pages using HyperText Markup Language (HTML). References: CompTIA DataSys+ Course Outline, Domain2.0 Database Deployment, Objective 2.2 Given a scenario, create database objects using scripting and programming languages.

• Question 34:

  A group of developers needs access to a database in a development environment, but the database contains sensitive data. Which of the following should the database administrator do before giving the developers access to the environment?

  A. Audit access to tables with sensitive data.

  B. Remove sensitive data from tables

  C. Mask the sensitive data.

  D. Encrypt connections to the development environment.

  Correct Answer: C

  The database administrator should mask the sensitive data before giving the developers access to the environment. Data masking is a technique that replaces sensitive data with fictitious but realistic data, such as random numbers or characters, to protect it from unauthorized access or exposure. Data masking preserves the format and structure of the original data, but does notreveal its actual value. This allows developers to work with realistic data without compromising its confidentiality or compliance. The other options are either insufficient or excessive for this scenario. For example, auditing access to tables with sensitive data may help monitor and track who accesses the data, but does not prevent it from being seen; removing sensitive data from tables may compromise the quality or completeness of the data, and may not be feasible if there is a large amount of data; encrypting connections to the development environment may protect the data in transit, but not at rest or in use. References: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.

• Question 35:

  Which of the following ismostlikely to prevent tampering with server hardware that houses data?

  A. Biometric locks

  B. Strong password policy

  C. Network firewall

  D. Surveillance cameras

  Correct Answer: A

  The option that is most likely to prevent tampering with server hardware that houses data is biometric locks. Biometric locks are devices that use biological characteristics, such as fingerprints, facial recognition, iris scan, etc., to control access to a physical location or resource. Biometric locks help prevent tampering with server hardware that houses data by restricting unauthorized entry or theft of the hardware by intruders or attackers. Biometric locks also provide higher security and convenience than other types of locks, such as keys or passwords, which can be lost, stolen, or forgotten. The other options are either not related or not effective for this purpose. For example, a strong password policy is a set of rules or standards for creating and managing passwords for user accounts or systems; a network firewall is a device or software that controls the incoming and outgoing traffic on a network based on a set of rules or policies; surveillance cameras are devices that capture and record video footage of a physical location or resource. References: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.

• Question 36:

  A business analyst is using a client table and an invoice table to create a database view that shows clients who have not made purchases yet. Which of the following joins ismostappropriate for the analyst to use to create this database view?

  A. INNER JOIN ON Client.Key = Invoice.Key

  B. RIGHT JOIN ON Client.Key = Invoice.Key WHERE BY Client.Key ISNOLL

  C. LEFT JOIN ON Client.Key = Invoice.Key

  D. LEFT JOIN ON Client.Key = Invoice.Key WHEREBY Invoice.Key ISNOLL

  Correct Answer: D

  The join that is most appropriate for the analyst to use to create this database view is option D. This join uses the LEFT JOIN clause to combine the client table and the invoice table based on the matching values in the Key column. The WHERE clause filters out the rows where the Invoice.Key column is not null, meaning that the client has made a purchase. The result is a view that shows only the clients who have not made any purchases yet. The other options either do not produce the desired result or have syntax errors. For example, option A would show only the clients who have made purchases, option B would show only the invoices that do not have a matching client, and option C would show all the clients regardless of their purchase status. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.2 Given a scenario, execute database tasks using scripting and programming languages.

• Question 37:

  Which of the following is the correct order of the steps in the database deployment process?

  A. 1. Connect

  2.

  Install

  3.

  Configure

  4.

  Confirm prerequisites

  5.

  Validate

  6.

  Test

  7.

  Release

  B. 1. Configure

  2.

  Install

  3.

  Connect

  4.

  Test

  5.

  Confirm prerequisites

  6.

  Validate

  7.

  Release

  C. 1. Confirm prerequisites

  2.

  Install

  3.

  Configure

  4.

  Connect

  5.

  Test

  6.

  Validate

  7.

  Release

  D. 1. Install

  2.

  Configure

  3.

  Confirm prerequisites

  4.

  Connect

  5.

  Test

  6.

  Validate

  7.

  Release

  Correct Answer: C

  The correct order of the steps in the database deployment process is option C. This order follows the best practices for deploying a database system, which are:

  Confirm prerequisites: Check the system requirements and compatibility of the database software and tools before installation.

  Install: Install the database software and tools on the target server or platform. Configure: Configure the database settings and parameters according to the specifications and needs of the application or organization. Connect: Connect the

  database to the network and other systems or applications that will access it.

  Test: Test the functionality and performance of the database system and verify that it meets the expectations and requirements.

  Validate: Validate the data quality and integrity of the database system and ensure that it complies with the standards and regulations. Release: Release the database system to production and make it available for use by end-users or

  customers. The other options do not follow this order and may result in errors, inefficiencies, or security issues. References: CompTIA DataSys+ Course Outline, Domain 2.0 Database Deployment, Objective 2.1 Given a scenario, install and

  configure database software and tools.

• Question 38:

  Which of the following cloud delivery models provides users with thehighestlevel of flexibility regarding resource provisioning and administration?

  A. DBaaS

  B. IaaS

  C. SaaS

  D. PaaS

  Correct Answer: B

  The cloud delivery model that provides users with the highest level of flexibility regarding resource provisioning and administration is IaaS. IaaS, or Infrastructure as a Service, is a cloud delivery model that provides users with access to virtualized computing resources, such as servers, storage, network, and operating systems, over the internet. Users can provision, configure, and manage these resources according to their needs and preferences, without having to worry about the maintenance or security of the physical infrastructure. IaaS offers users the most control and customization over their cloud environment, as well as the ability to scale up or down as needed. The other options are either different cloud delivery models or not related to cloud computing at all. For example, DBaaS, or Database as a Service, is a cloud delivery model that provides users with access to database management systems and tools over the internet; SaaS, or Software as a Service, is a cloud delivery model that provides users with access to software applications and services over the internet; PaaS, or Platform as a Service, is a cloud delivery model that provides users with access to development platforms and tools over the internet. References: CompTIA DataSys+ Course Outline, Domain 2.0 Database Deployment, Objective 2.1 Given a scenario, select an appropriate database deployment method.

• Question 39:

  A database administrator needs to ensure that a newly installed corporate business intelligence application can access the company's transactional data. Which of the following tasks should the administrator performfirst?

  A. Create a new service account exclusively for the business intelligence application.

  B. Build a separate data warehouse customized to the business intelligence application's specifications.

  C. Set up a nightly FTP data transfer from the database server to the business intelligence application server.

  D. Send the business intelligence administrator the approved TNS names file to configure the data mapping.

  E. Open a new port on the database server exclusively for the business intelligence application.

  Correct Answer: A

  The first task that the administrator should perform is to create a new service account exclusively for the business intelligence application. This will ensure that the application has the appropriate permissions and credentials to access the company's transactional data. The other options are either unnecessary, inefficient, or insecure. For example, building a separate data warehouse would require additional resources and time, setting up a nightly FTP data transfer would expose the data to potential breaches, sending the TNS names file would not guarantee that the application can connect to the database, and opening a new port on the database server would create a vulnerability for attackers. References: CompTIA DataSys+ Course Outline, Domain 2.0 Database Deployment, Objective 2.1 Given a scenario, install and configure database software and tools.

• Question 40:

  Which of the following resources is the best way to lock rows in SQL Server?

  A. TID

  B. SID

  C. RID

  D. PID

  Correct Answer: C

  The resource that is the best way to lock rows in SQL Server is RID. RID, or Row IDentifier, is an attribute that uniquely identifies each row in a heap table in SQL Server. A heap table is a table that does not have a clustered index, which means that the rows are not stored in any particular order. A RID consists of the file number, page number, and slot number of the row in the database. A RID can be used to lock rows in SQL Server to prevent concurrent access or modification by other transactions or users. A RID lock is a type of lock that locks a single row using its RID. A RID lock can be applied using the HOLDLOCK or XLOCK hints in a SELECT statement. The other options are either not related or not effective for this purpose. For example, TID, or Transaction IDentifier, is an attribute that uniquely identifies each transaction in a database; SID, or Security IDentifier, is an attribute that uniquely identifies each user or group in a Windows system; PID, or Process IDentifier, is an attribute that uniquely identifies each process in an operating system. References: CompTIA DataSys+ Course Outline, Domain 3.0 Database Management and Maintenance, Objective 3.3 Given a scenario, implement database concurrency methods.