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NEW QUESTION # 58
What is the name of the wireless technology that specifically accommodates distances up to 300 feet?
Answer: C
Explanation:
Bluetooth is the wireless technology commonly identified in IT fundamentals as supporting short-range communication up to around 300 feet in higher-power implementations. Bluetooth is designed for personal area networking, connecting devices such as headphones, keyboards, speakers, and smartphones with low power consumption and easy pairing. Different Bluetooth classes exist: some provide only a few meters of range, while higher-power versions can extend to roughly 100 meters, which is close to 300 feet, under good conditions. Wi-Fi typically supports larger local-area coverage and is used to connect devices to local networks and the internet. A wide area network is not a wireless technology standard; it is a type of network spanning large geographic areas. Near field communication is designed for extremely short distances, usually a few centimeters, and is used for contactless payments and quick device taps. Since the question asks for a wireless technology specifically accommodating distances up to 300 feet, Bluetooth best matches that description.
NEW QUESTION # 59
Which aspect of the CIA Triad requires that data are correct?
Answer: D
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 # 60
In which generafion of computers were vacuam tubes used as one of the hardware components?
Answer: C
Explanation:
*Verified Answer: Vacuum tubes were used as one of the hardware components in the first generation of computers.
*Explanation: The first-generation computers, developed between 1946 and 1959, relied on vacuum tubes for their circuitry. These vacuum tube computers paved the way for electronic computing.
NEW QUESTION # 61
What is the correct definition of a join query?
Answer: B
Explanation:
A join in the context of a database, specifically SQL, is an operation that combines rows from two or more tables based on a related column between them. The purpose of a join is to retrievedata that exists across multiple tables which share a common field or key. The process typically involves the following steps:
1.Identify the Tables: Determine the tables that you want to join.
2.Determine the Common Column(s): Find the column(s) that the tables share, which will be used to match rows.
3.Choose the Type of Join: Decide on the type of join that suits your needs (INNER, LEFT, RIGHT, FULL).
4.Construct the Join Query: Write the SQL statement that specifies the join condition using the ON keyword.
5.Execute the Query: Run the query in the database to retrieve the combined results.
For example, if you have an Orders table and a Customers table, and both have a CustomerID column, you can join them on this column to retrieve a list of orders along with the customer information for each order.
References: The definition and explanation are based on standard SQL documentation and educational resources such as W3Schools1 and GeeksforGeeks2, which provide comprehensive guides on SQL joins.
NEW QUESTION # 62
An IT department employee is identifying the Boolean data in a system. What is one example of this type of data?
Answer: D
Explanation:
Boolean data represents a logical value with only two possible states, typically true or false. In Information Technology, Boolean types are foundational for conditions, comparisons, control flow, and database fields that store yes-or-no style information. The example, "Whether a number is positive or not," fits Boolean data because the statement can be evaluated as true if the number is greater than zero, or false otherwise. This two- state characteristic is exactly what defines Boolean logic. The other options describe different data types: the first letter of a last name is a character, a full last name is a character string, and the price of gas in dollars and cents is numeric with decimals, typically stored as a floating-point or fixed-point decimal type. Boolean fields are widely used in systems for flags such as active or inactive, approved or not approved, and eligible or not eligible. Therefore, the correct example of Boolean data is whether a number is positive or not.
NEW QUESTION # 63
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