Question 1

Distinguish between local area and wide area networks.

Accepted Answer

The answer of Distinguish between local area and wide area...

Question 2

A ________ is a device that converts digital signals from a computer into analog signals so that telephone lines may be used as a transmission medium to send and receive electronic data.

Accepted Answer

A modem is specifically designed to convert digital signals into analog signals for transmission over telephone lines, making it the best choice for this scenario. A LAN card, network adapter, PCI connector, and USB port are not designed for this specific function.

Question 3

Application services are repositories containing information about users,user groups,resources on a network,access rights,and so on.

Accepted Answer

Application services provide functionality for applications, such as web services, processing, and business logic, rather than storing information about users, groups, resources, and access rights, which are typically managed by directory services.

Question 4

A bus network topology offers the greatest coverage in terms of distances,among all network topologies.

Accepted Answer

A bus network topology is not designed for extensive coverage in terms of distances; instead, topologies like mesh or star, especially when implemented with technologies such as fiber optics, can offer greater coverage and scalability.

Question 5

Integrated services digital network (ISDN)uses existing twisted-pair (TP)telephone wires to provide high-speed data service.

Accepted Answer

ISDN is a digital telecommunications network that uses existing TP telephone wires to provide high-speed data service, as well as voice and other services.

Question 6

Elimination of data redundancy is the major goal and benefit of using data normalization techniques.

Accepted Answer

Data normalization is a process of organizing data in a database by breaking down large tables into smaller, more manageable tables and eliminating data redundancy. This helps to reduce inconsistencies and inaccuracies in data, improve data integrity, and ensure data consistency throughout the database. Therefore, the major goal and benefit of using data normalization techniques is to eliminate data redundancy.

Question 7

Which of the following Internet connectivity technologies enables data to be sent over existing copper telephone lines by sending digital pulses in the high-frequency area of telephone wires?

Accepted Answer

Digital subscriber line (DSL) technology enables data to be sent over existing copper telephone lines by sending digital pulses in the high-frequency area of telephone wires. It allows faster data transmission than traditional dial-up service technology. Integrated services digital network (ISDN) technology also uses telephone lines but it requires dedicated digital lines and offers more advanced features than DSL. Cable modem technology uses cable TV lines instead of telephone lines to transmit data. Fiber-to-home technology uses fiber-optic cables to deliver high-speed internet connectivity.

Question 8

Which of the following entities is responsible for managing global and country code top-level domains,as well as global Internet protocol (IP)number space assignments?

Accepted Answer

The Internet Assigned Numbers Authority (IANA) is responsible for managing global and country code top-level domains, as well as global Internet protocol (IP) number space assignments. The American Registry for Internet Numbers (ARIN) manages IP address allocation for the United States, Canada, and parts of the Caribbean. The World Wide Web Consortium (W3C) is an international community that develops web standards. The Internet Governance Forum (IGF) is a platform for discussing Internet governance issues. The European Organization for Nuclear Research (CERN) is a scientific research organization.

Question 9

A ________ key is a unique identifier that should be created and used when designing a database for each type of entity,in order to store and retrieve data accurately.

Accepted Answer

A primary key is a unique identifier that should be created and used when designing a database for each type of entity in order to store and retrieve data accurately. It uniquely identifies each record in the table and is used as a reference key for other tables that may contain references to the primary key. Foreign keys are used to create relationships between tables and reference primary keys in other tables. Surrogate keys are artificial keys assigned by the system to provide a unique identifier when a natural key may not be available. Super keys are sets of attributes that can be used to identify a record in a table. Candidate keys are a subset of the super key that can uniquely identify a record in a table.

Question 10

A ________ is a networking hardware component that manages multiple access points and can be used to manage transmission power and channel allocation to establish desired coverage throughout a building and minimize interference between individual access points.

Accepted Answer

A wireless controller is a networking hardware component that manages multiple access points and can be used to manage transmission power and channel allocation to establish desired coverage throughout a building and minimize interference between individual access points. A router is a networking device that forwards data packets between computer networks, a network switch is a networking hardware component that connects devices together on a computer network, a modem is a networking hardware component that connects a computer or router to a broadband network, and a network interface card is a hardware component that provides a computer with a connection to a network. None of these options fit the definition of a wireless controller given in the question. Therefore, B is the best choice.

Question 11

Microwave signals can be disrupted over longer distances by environmental conditions such as high winds and heavy rain.

Accepted Answer

Microwave signals can be disrupted by environmental conditions such as high winds and heavy rain. This is because these types of weather conditions can cause physical obstacles and interference that disrupt the microwave signal.

Question 12

Which of the following database models represent entities as two-dimensional tables,with records as rows,and attributes as columns?

Accepted Answer

The relational database model is based on the concept of representing data as two-dimensional tables, with records as rows and attributes as columns. This model is widely used and is known for its flexibility, scalability, and ease of use. The other database models listed do not represent data in this tabular form.

Question 13

Compare and contrast centralized and distributed computing.

Accepted Answer

The answer of Compare and contrast centralized and distributed computing....

Question 14

________ is a technique to make complex databases more efficient and more easily handled by the database management system (DBMS).

Accepted Answer

Normalization is the technique used to make complex databases more efficient and easier to handle by eliminating redundant data and ensuring data consistency. Normalization involves dividing larger tables into smaller ones and defining relationships between them to reduce data redundancy and inconsistency. This improves database performance and reduces the likelihood of errors or inconsistencies in the data. Assertion, exception handling, model elimination, and structural induction are not techniques used for database optimization and organization.

Question 15

The most common database management system (DBMS)approach in use today is the relational database model.

Accepted Answer

This is true as the relational database model is widely used in various industries and has become the standard approach for organizing and managing data.

Question 16

Collaborative computing is a synergistic form of distributed computing in which two or more networked computers are used to accomplish a common processing task.

Accepted Answer

Collaborative computing involves multiple computers working together towards a common goal, making it a form of distributed computing.

Question 17

A(n)________ is a unique identifier assigned on the network interface cards by the manufacturers to identify the computers on the network.

Accepted Answer

The media access control (MAC) address is a unique identifier assigned by the manufacturer to each network interface card (NIC) in a computer or device. It is used for communication on the local network and helps to identify and differentiate between different devices on the network. The IP configuration, IP address, port address, and network key are all different aspects of network configuration and security, but they are not unique identifiers for individual devices on the network.

Question 18

Compare and contrast star network,ring network,bus network,and mesh network topologies.

Accepted Answer

The answer of Compare and contrast star network,ring network,bus network,and...

Question 19

The emergence of new computing models,such as distributed computing,has resulted in organizations completely abandoning the older centralized computing technologies.

Accepted Answer

While the emergence of new computing models, such as distributed computing, has led to a shift towards these newer technologies, it is rare for organizations to completely abandon older centralized computing technologies. Many organizations still rely on a combination of different computing models to meet their needs.

Question 20

A ________ key refers to an attribute that appears as a non-primary key attribute in one entity and as a primary key attribute (or part of a primary key)in another entity.

Accepted Answer

A foreign key is an attribute in one table that refers to the primary key of another table. It establishes a link or relationship between the two tables.

Quiz 11: Appendix: Technology Briefing: Foundations of Information Systems Infrastructure