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NEW QUESTION # 16
Which hardware component provides electric pulses that electronic components need in order to operate?
Answer: B
Explanation:
The system clock provides the electric timing pulses that electronic components use to coordinate operations.
In Information Technology hardware architecture, digital circuits require a consistent timing signal to synchronize actions such as executing CPU instructions, transferring data across buses, and coordinating memory access. The clock signal is a repeating electrical waveform that establishes a rhythm for the system, allowing components to perform steps in a controlled sequence. CPU speed is commonly measured in cycles per second, such as gigahertz, which reflects how many clock cycles occur each second. While the motherboard contains circuits and connectors that distribute signals, and expansion buses carry data between components, they do not generate the fundamental timing pulses. A hard drive stores data and does not provide timing for the overall system. Because the question asks specifically about providing electric pulses required for operation, it refers to the system clock function that produces and distributes the timing signal.
Therefore, the correct answer is system clock.
NEW QUESTION # 17
Which two actions are included in the role of a Domain Name System (DNS)?
Choose 2 answers
Answer: A,B
Explanation:
1.Translates human-friendly aliases into IP addresses: DNS serves as the "phone book" of the internet, converting user-friendly domain names (like www.example.com) into numerical IP addresses (such as
192.0.2.1) that computers and network devices use to locate one another on the internet12.
2.Stores IP addresses and aliases in a table on the server: DNS servers maintain records that map domain names to corresponding IP addresses. These records are stored in distributed databases across various DNS servers, ensuring efficient and reliable resolution of domain names1.
References
1.GeeksforGeeks: What is Domain Name System (DNS)?
2.Cloudflare: What is DNS? How DNS works
NEW QUESTION # 18
Which aspect of the CIA Triad requires that data are correct?
Answer: C
Explanation:
1.Integrity: This principle focuses on maintaining the accuracy and trustworthiness of data. It ensures that data remains unaltered and free from corruption. Key points related to integrity:
oData Accuracy: Integrity ensures that data reflects the true state of information. Any unauthorized changes or alterations are detected and prevented.
oHash Functions: Hash functions are commonly used to verify data integrity. These functions generate a fixed-size hash value (checksum) based on the original data. If any part of the data changes, the hash value will also change, indicating potential tampering.
oDigital Signatures: Digital signatures provide a way to verify the integrity of electronic documents. They use asymmetric encryption to sign data, ensuring that it has not been altered since the signature was applied.
oData Validation: Implementing input validation and proper access controls helps maintain data integrity by preventing unauthorized modifications.
2.Confidentiality and Availability:
oConfidentiality: This principle ensures that only authorized users can access sensitive data. It focuses on keeping information private and restricting access.
oAvailability: Availability ensures that authorized users can access data when needed. It prevents data from being unavailable due to system failures, attacks, or other disruptions.
3.Balancing the Triad:
oWhile all three principles are essential, they can sometimes conflict with each other. For example:
Enhancing confidentiality (e.g., strong encryption) may impact availability (e.g., longer decryption times).
Rigorous integrity checks can affect system performance.
oOrganizations must strike a balance based on their specific security requirements.
References
*CSO Online: The CIA triad: Definition, components, and examples
*Comparitech: What is the CIA triad - confidentiality, integrity, and availability?
*Preventive Approach: CIA Triad: A Comprehensive Guide for Beginners
NEW QUESTION # 19
What can applications use to interact with a database?
Answer: A
Explanation:
SQL is the standard language for communicating with relational databases. Applications use SQL to:
*Retrieve data: SELECT queries are used to fetch specific data from database tables.
*Modify data: INSERT, UPDATE, and DELETE statements allow applications to add, change, or remove data in the database.
*Manage database structure: CREATE, ALTER, and DROP statements let applications create tables, modify their structure, or delete them entirely.
NEW QUESTION # 20
Which item is an input device?
Answer: A
Explanation:
An input device is any hardware device that sends data to a computer, allowing you to interact with and control it. Input devices enable users to input information into the computer system. Let's break down the options:
*Flash Drive (A): A flash drive (also known as a USB drive or thumb drive) is a storage device, not an input device. It allows you to store and transfer data but does not directly input data into the computer.
*CD (B): A CD (compact disc) is also a storage medium, typically used for storing audio, video, or software files. Like a flash drive, it is not an input device.
*Scanner : A scanner is a classic example of an input device. It captures physical documents, images, or text and converts them into digital data that the computer can process. Scanners are commonly used for tasks like digitizing photos, creating PDFs, or scanning documents.
*Printer (D): A printer is an output device, not an input device. It produces hard copies (printed documents) based on digital data received from the computer.
In summary, the correct answer is C. Scanner, as it directly inputs data into the computer system.
References:
1.Computer Hope: What is an Input Device?
2.BBC Bitesize: What are input and output devices?
NEW QUESTION # 21
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