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質問 # 98
Which of the following tools is used for natively running a Linux system in Windows?
正解：B
解説：
The tool that is used for natively running a Linux system in Windows is WSL. WSL, or Windows Subsystem for Linux, is a feature that allows users to run a Linux system natively on Windows 10 or Windows Server. WSL enables users to install and use various Linux distributions, such as Ubuntu, Debian, Fedora, etc., and run Linux commands, tools, applications, etc., without requiring a virtual machine or a dual-boot setup. WSL also provides users with interoperability and integration between Linux and Windows, such as file system access, network communication, process management, etc. WSL is useful for users who want to use Linux features or functionalities on Windows, such as development, testing, scripting, etc. The other options are either different tools or not related to running a Linux system in Windows at all. For example, Remote Desktop Protocol (RDP) is a protocol that allows users to remotely access and control another computer or device over a network; SSH, or Secure Shell, is a protocol that allows users to securely connect and communicate with another computer or device over a network; Telnet is a protocol that allows users to interact with another computer or device over a network using a text-based interface. Reference: CompTIA DataSys+ Course Outline, Domain 2.0 Database Deployment, Objective 2.2 Given a scenario, create database objects using scripting and programming languages.
質問 # 99
Which of the following is a typical instruction that is found on a Linux command-line script and represents a system shell?
正解：B
解説：
The instruction that is found on a Linux command-line script and represents a system shell is #!/bin/bash. This instruction is called a shebang or a hashbang, and it indicates the interpreter that should be used to execute the script. In this case, the interpreter is /bin/bash, which is the path to the bash shell, a common system shell for Linux. A system shell is a program that provides an interface for users to interact with the operating system, either through commands or scripts. A system shell can also perform various tasks, such as file management, process control, variable assignment, etc. The other options are either incorrect or not typical for this purpose. For example, /bin/bash is the path to the bash shell, but it does not indicate the interpreter for the script; #/bin/shell is not a valid shebang or a path to a system shell; >/bin/sh is a redirection operator followed by a path to a system shell, but it does not indicate the interpreter for the script. Reference: CompTIA DataSys+ Course Outline, Domain 2.0 Database Deployment, Objective 2.2 Given a scenario, create database objects using scripting and programming languages.
質問 # 100
(Which of the following describes the method in which data is encrypted first with an encryption key and then wrapped by a managed root key?)
正解：A
解説：
The correct answer is D. Envelope encryption. CompTIA DataSys+ describes envelope encryption as a key management and data protection method that combines the efficiency of symmetric encryption with the security and manageability of hierarchical key structures. In this approach, data is first encrypted using a data encryption key (DEK), and then the DEK itself is encrypted (or "wrapped") using a key encryption key (KEK), often referred to as a managed root key.
Envelope encryption is widely used in enterprise database systems and cloud platforms because it provides strong security while simplifying key rotation and management. Encrypting large volumes of data directly with a root or master key would be inefficient and risky. Instead, DataSys+ explains that symmetric DEKs are used for fast data encryption, while the root key is used only to protect the DEKs. If a root key must be rotated or compromised, only the wrapped DEKs need to be re-encrypted-not the underlying data.
Option A, asymmetric encryption, uses public and private key pairs but is computationally expensive and not typically used to encrypt large datasets directly. Option B, DEK-based encryption, is incomplete because it describes only the use of data encryption keys and does not account for the additional wrapping layer that defines envelope encryption. Option C, symmetric encryption, correctly describes how data is encrypted but does not include the managed key hierarchy required by the question.
CompTIA DataSys+ emphasizes envelope encryption as a best practice for data-at-rest protection, particularly in environments that require compliance, auditing, and centralized key management. It is commonly implemented using hardware security modules (HSMs) or cloud key management services.
Therefore, the method where data is encrypted with a DEK and then wrapped with a managed root key is envelope encryption, making option D the correct and fully verified answer.
質問 # 101
A programmer wants to configure a database to only allow read or write access when requests are coming from specific IP addresses. Which of the following can be used to configure IP addresses to allow access to the database?
正解：C
解説：
The best option to configure IP addresses to allow access to the database is a firewall. A firewall is a network device or software that controls the incoming and outgoing traffic based on a set of rules or policies. A firewall can be used to filter the traffic by IP addresses, ports, protocols, or other criteria, and allow or deny access to the database accordingly. The other options are either not relevant or not sufficient for this task. For example, a static IP address is an IP address that does not change over time, but it does not determine the access to the database; a dynamic IP address is an IP address that changes periodically, but it does not control the traffic to the database; an IDNS is an Internet Domain Name System, which translates domain names into IP addresses, but it does not regulate the access to the database. References: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.
質問 # 102
(Which of the following are logical infrastructure security measures? Select two.)
正解：C、F
解説：
The correct answers are A. Firewall and B. Strong passwords. CompTIA DataSys+ differentiates security controls into logical (technical) and physical infrastructure security measures. Logical security measures are implemented through software, configuration, and system controls to protect data, systems, and network resources from unauthorized access or misuse.
A firewall is a core logical infrastructure security control. It enforces security rules that regulate incoming and outgoing network traffic based on predefined policies. In database environments, firewalls are used to restrict access to database servers, limit exposed ports, and allow connections only from trusted IP addresses or networks. DataSys+ emphasizes firewalls as a first line of defense in protecting databases from unauthorized access and network-based attacks.
Strong passwords are another essential logical security measure. They are part of authentication controls that ensure only authorized users can access systems and databases. Strong password requirements-such as minimum length, complexity, expiration, and reuse restrictions-help mitigate attacks like brute-force attempts, credential stuffing, and unauthorized privilege escalation. DataSys+ highlights strong authentication controls as foundational to protecting database environments.
Option D, port security, can be ambiguous, but in CompTIA context it is often associated with network switch configurations and is more infrastructure-specific; however, the exam most clearly classifies firewall and authentication mechanisms as logical controls. Options C, E, and F-key cards, camera systems, and time locks-are all physical security controls. These protect the physical facility or hardware but do not directly enforce access through software or system logic.
CompTIA DataSys+ stresses a layered security approach, where logical controls protect data and systems, while physical controls protect facilities. In this question, the focus is explicitly on logical infrastructure security, making Firewall and Strong passwords the most accurate and clearly aligned answers.
Therefore, the correct selections are A and B.
質問 # 103
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