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NEW QUESTION # 122
Which of the following is required for communication over the Internet?
Answer: A
Explanation:
Communication over the Internet relies on packet-switched networks. Here's why:
1.Packet Switching:
oThe Internet uses a packet-switching approach to transmit data.
oIn this method, data is divided into smaller packets before transmission.
oEach packet contains a portion of the original data along with addressing information.
oThese packets are then sent independently across the network.
oAt the destination, the packets are reassembled to reconstruct the original data.
2.Advantages of Packet Switching:
oEfficiency: Packet switching allows multiple users to share the same network resources efficiently.
oRobustness: If a link or node fails, packets can find alternative routes to reach their destination.
oScalability: The network can handle varying traffic loads without significant reconfiguration.
3.Other Options:
oAn IP Alias: An IP alias is an additional IP address associated with a network interface. It is not a requirement for communication over the Internet.
oA LAN (Local Area Network): A LAN is a local network within a limited geographical area. While LANs are essential for local communication, they are not directly required for Internet communication.
oA circuit-switched network: Circuit-switched networks establish dedicated connections between sender and receiver. The Internet does not use this approach.
oAn analog signal: Analog signals were used in older communication systems (e.g., telephone lines), but the Internet primarily relies on digital signals.
References:
*1ITExamAnswers: 5.4.3 Communications Principles Quiz Answers
*2GCFGlobal.org: Computer Basics - Connecting to the Internet
NEW QUESTION # 123
What is the arrangement of network devices in a mesh topology?
Answer: C
Explanation:
In a mesh topology, every device is connected to every other device. In Information Technology networking fundamentals, a full mesh topology provides multiple direct paths between nodes, which improves redundancy and fault tolerance. If one connection fails, data can often be rerouted through other links, reducing the chance of total network disruption. This makes mesh designs valuable for mission-critical environments where high availability is required. However, the number of connections grows quickly as devices increase, which raises cost, complexity, and management overhead. The other options describe different topologies: a star topology connects all devices to a central device such as a switch, a bus topology connects devices to a single shared communication line, and a ring topology connects each device to exactly two others, forming a loop. Because the defining feature of a mesh is the extensive interconnection among devices, the correct description is that every device is connected to every other device. Therefore, the correct answer is option C.
NEW QUESTION # 124
The primary database application used by a company is having issues, specifically with the layer that alters the database after receiving a request. What is the name of this layer of the database application?
Answer: A
Explanation:
The layer responsible for altering a database after receiving a request is the database management layer. In standard database architecture, the database management system acts as the software layer that processes requests, enforces rules, and performs operations such as insert, update, and delete. When an application or user submits a query or transaction, the database management layer interprets the request, checks permissions and constraints, manages concurrency so multiple users can work safely, and then applies changes to the stored data. It also helps ensure reliability through transaction controls such as commit and rollback, which protect data integrity when failures occur. The application layer is where the user interface and business logic typically run, but it does not directly manage the physical storage and controlled updates of the database. The flat-file layer is not a standard layer in modern database applications, and object-oriented layer refers to a programming design style rather than the core DBMS component. Therefore, the correct layer is the database management layer.
NEW QUESTION # 125
What type of a system requirement involves preventing unauthorized access to data?
Answer: B
Explanation:
*Unauthorized access refers to gaining entry or access to a system, physical or electronic, without the permission of the owner or administrator.
*Security is the type of system requirement that involves preventing unauthorized access to data.
*Security measures include:
oAuthentication: Verifying user identity.
oEncryption: Protecting data from unauthorized viewing.
oAccess controls: Limiting who can access specific resources.
oFirewalls: Filtering network traffic.
*Ensuring security helps safeguard sensitive information and maintain data integrity.
References:
1.Unauthorized Access: Risks, Examples, and 6 Defensive Measures
2.How to Prevent Unauthorized Access: 10 Best Practices
3.Threat Picture: Unauthorized Access Prevention
4.PMC: Protecting Information with Cybersecurity
5.Cyberpedia: Unauthorized Data Access
1: Unauthorized Access: Risks, Examples, and 6 Defensive Measures 2: How to Prevent Unauthorized Access: 10 Best Practices 3: Threat Picture: Unauthorized Access Prevention 4: PMC: Protecting Information with Cybersecurity 5: Cyberpedia: Unauthorized Data Access
NEW QUESTION # 126
Which type of systems testing includes having end users test the system with simulated data and the help of the developer?
Answer: D
Explanation:
User Acceptance Testing (UAT) is a type of systems testing that involves end users testing the system with simulated data and the assistance of the developer or testing team. Let's break down the options:
*User Acceptance (A): UAT is the final phase of testing before the software is released to production. It ensures that the system meets the business requirements and is acceptable to end users. During UAT, actual users (not developers) validate the system's functionality, usability, and overall performance using real-world scenarios and data.
*Alpha (B): Alpha testing is conducted by the development team within the organization. It is an early-stage testing phase where developers test the software for defects and issues. End users are not directly involved in alpha testing.
*Beta : Beta testing occurs after alpha testing. It involves releasing the software to a limited group of external users (beta testers) who provide feedback. Beta testing is not specifically focused on simulated data or end user involvement.
*Analysis (D): Analysis is not a type of systems testing. It refers to the process of examining data, identifying patterns, and drawing conclusions.
In summary, the correct answer is A. User Acceptance, which aligns with the scenario described in the question.
References:
1.ISTQB Glossary: User Acceptance Testing
NEW QUESTION # 127
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