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Computer Networks Quiz 4 (10 MCQs)

This set of multiple-choice questions assesses understanding of computer networks, including network types, resource sharing, communication media, and remote access protocols. It evaluates knowledge of network services, application execution, storage protocols like iSCSI and Fibre Channel, and network reliability. The questions cover data communication, transmission media, and the functions of network devices, as well as wireless technologies such as Wi-Fi and cellular networks.

Quiz Instructions

Select an option to see the correct answer instantly.

1. Communication between computers using standard telephone service

Correct Answer: Correct answer is: (A) Requires a change to an anolog signal.

Exam Relevance: CCNA, CompTIA Network+, CIW Network Specialist

Difficulty: Moderate

Concept notes: In computer networks, communication over standard telephone lines requires converting digital signals to analog signals because telephone lines are designed to transmit analog signals.

Common Mistakes: A common misunderstanding is that digital signals can be directly transmitted over telephone lines without any conversion.

Explanations: Standard telephone service uses analog signals to transmit voice data. When computers communicate over these lines, they must convert their digital signals to analog signals to be compatible with the telephone network. This conversion is typically done using a modem, which stands for modulator-demodulator. The modem modulates the digital signal into an analog signal for transmission and demodulates the analog signal back into a digital signal upon reception.

Option Analysis:

Option A: Correct. Digital signals from computers need to be converted to analog signals for transmission over standard telephone lines.
Option B: Incorrect. Standard telephone service is not the most efficient method for data transmission compared to modern digital networks.
Option C: Incorrect. Analog signals over telephone lines can be susceptible to noise and disturbances, especially over long distances.
Option D: Incorrect. Option A is the correct answer.

2. Which of the following is NOT a type of transmission medium?

Correct Answer: Correct answer is: (C) Modem.

Exam Relevance: CCNA, CompTIA Network+, CIW Network Specialist

Difficulty: Easy

Concept notes: Transmission media are the physical paths over which data travels in a network. Examples include coaxial cables, twisted pair cables, and microwave signals. A modem, however, is a device that modulates and demodulates signals for transmission over a medium, but it is not a medium itself.

Common Mistakes: A common mistake is confusing a modem with a transmission medium. While a modem is essential for network communication, it is a device, not a medium.

Explanations: Coaxial cables, twisted pair cables, and microwave signals are all types of transmission media used to carry data in a network. A modem, on the other hand, is a device that converts digital signals into analog signals and vice versa for transmission over a medium. Therefore, a modem is not a type of transmission medium.

Option Analysis:

Option A: Coaxial cables are a type of transmission medium used in networks.
Option B: Twisted pair cables are a type of transmission medium used in networks.
Option C: A modem is a device, not a transmission medium.
Option D: Microwave signals are a type of transmission medium used in networks.

3. Which of the following uses storage protocol rather than networking protocol?

Correct Answer: Correct answer is: (A) Storage Area Network.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Moderate

Concept notes: A Storage Area Network (SAN) uses storage protocols to connect and manage data storage devices and servers. SANs are designed to provide high-speed access to storage devices, typically using protocols like Fibre Channel, iSCSI, or FCoE, which are specialized for storage rather than general networking.

Common Mistakes: A common misunderstanding is that all networks use general networking protocols like TCP/IP. However, specialized networks like SANs use specific storage protocols to optimize data transfer and management.

Explanations: Storage Area Networks (SANs) use storage protocols such as Fibre Channel, iSCSI, or FCoE, which are designed specifically for efficient data storage and retrieval. These protocols are distinct from general networking protocols like TCP/IP, which are used in other types of networks such as Metropolitan Area Networks (MANs). Therefore, SANs use storage protocols rather than networking protocols.

Option Analysis:

Option A: Correct. SANs use storage protocols like Fibre Channel, iSCSI, or FCoE.
Option B: Incorrect. MANs use general networking protocols like TCP/IP.
Option C: Incorrect. Not all networks use storage protocols.
Option D: Incorrect. There is a correct option, which is SANs.

Mnemonic: SANs use SANs, not MANs.

4. What is the collection of two or more computers joined together through communication media, to share information and resources called?

Correct Answer: Correct answer is: (A) Network.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: A network is a collection of two or more computers joined together through communication media to share information and resources.

Common Mistakes: A common misunderstanding is confusing a network with the internet. While the internet is a type of network, not all networks are the internet.

Explanations: A network is defined as a system where multiple computers are connected to share resources and information. This definition directly matches the description given in the question. The internet, on the other hand, is a global network of networks, and half-duplex and full-duplex refer to communication modes, not to the structure of a network.

Option Analysis:

Option A: Correct. A network is a collection of two or more computers joined together through communication media to share information and resources.
Option B: Incorrect. The internet is a global network of networks, not a specific collection of computers joined together.
Option C: Incorrect. Half-duplex refers to a communication mode where data can be transmitted in both directions but not simultaneously, not a type of network.
Option D: Incorrect. Full-duplex refers to a communication mode where data can be transmitted in both directions simultaneously, not a type of network.

5. An internet service that allows users to connect to remote computers and run applications is termed

Correct Answer: Correct answer is: (C) Telnet.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: Telnet is a protocol used to connect to remote computers and run applications on those computers.

Common Mistakes: A common misunderstanding is that Gopher or Hypertext might be used for remote computer access, but they are primarily used for information retrieval and web browsing, respectively.

Explanations: Telnet allows users to connect to a remote computer and run applications as if they were using the remote computer directly. This makes it the correct choice for the given question.

Option Analysis:

Option A: Gopher is a protocol for distributing, searching, and retrieving documents but does not allow running applications on remote computers.
Option B: Hypertext is a method of organizing information using hyperlinks, typically used in web browsing, but not for remote application execution.
Option C: Telnet is the correct choice as it allows users to connect to remote computers and run applications.
Option D: VoIP (Voice over Internet Protocol) is used for voice communication over the internet and is not related to remote application execution.

6. If voice messages are important to the users of a WAN, the network should have .....,

Correct Answer: Correct answer is: (A) Circuit switching technology.

Exam Relevance: CCNA, CompTIA Network+, CIW Network Specialist

Difficulty: Moderate

Concept notes: Circuit switching technology is essential for voice communication in WANs because it establishes a dedicated path for the duration of the call, ensuring consistent and reliable transmission of voice data.

Common Mistakes: A common misunderstanding is that packet switching is sufficient for voice communication, but it can introduce delays and jitter, which are detrimental to voice quality.

Explanations: Circuit switching technology is designed to provide a dedicated communication path for the duration of a call, ensuring that voice messages are transmitted reliably and without significant delay. This is crucial for maintaining the quality of voice communication over a WAN. Other options like congestion, protocol suites, and Internet access do not specifically address the need for a dedicated, consistent communication path for voice messages.

Option Analysis:

Option A: Circuit switching technology is the correct choice as it provides a dedicated path for voice communication.
Option B: Congestion can degrade network performance but does not directly address the need for reliable voice communication.
Option C: A protocol suite is important for data communication but does not specifically ensure the quality of voice messages.
Option D: Access to the Internet is useful for various services but does not guarantee the quality of voice communication.

7. What does a modem do in a computer system?

Correct Answer: Correct answer is: (C) Connects your computer to the Internet.

Exam Relevance: CCNA, CompTIA Network+, CIW Network Specialist

Difficulty: Easy

Concept notes: A modem is a device that modulates and demodulates signals to enable data transmission over a network, primarily connecting a computer to the Internet.

Common Mistakes: A common misunderstanding is that a modem processes data like a CPU or stores data like a hard drive.

Explanations: A modem's primary function is to convert digital data from a computer into an analog signal that can be transmitted over telephone lines or other communication channels, and vice versa. This allows the computer to connect to the Internet and communicate with other devices on the network.

Option Analysis:

Option A: A modem does not process the computer's data; that is the function of the CPU.
Option B: A modem does not store data; that is the function of storage devices like hard drives or SSDs.
Option C: A modem connects your computer to the Internet by modulating and demodulating signals.
Option D: A modem does not output visual data to the monitor; that is the function of a graphics card and monitor.

8. This connection happens through radio waves.

Correct Answer: Correct answer is: (C) Wifi/Cell.

Exam Relevance: CCNA, CompTIA Network+, CIW Network Specialist

Difficulty: Easy

Concept notes: Radio waves are used for wireless communication in computer networks, such as Wi-Fi and cellular networks.

Common Mistakes: A common misunderstanding is that only wired connections like Ethernet or fiber optics are used for network communication.

Explanations: Radio waves are a form of electromagnetic radiation used for wireless communication. Wi-Fi and cellular networks both use radio waves to transmit data between devices and access points. This makes them suitable for the connection described in the question.

Option Analysis:

Option A: Ethernet uses cables for wired connections, not radio waves.
Option B: Fiber optic cables use light to transmit data, not radio waves.
Option C: Wi-Fi and cellular networks use radio waves for wireless communication.
Option D: This option is incorrect as Wi-Fi and cellular networks are valid methods of wireless communication using radio waves.

9. What is data communication?

Correct Answer: Correct answer is: (B) Transfer of electronic data from one point to the next over a communication medium.

Exam Relevance: CCNA, CompTIA Network+, CIW Network Specialist

Difficulty: Easy

Concept notes: Data communication involves the transmission of electronic data from one point to another through a communication medium.

Common Mistakes: A common misunderstanding is that data communication only involves the transfer of data, without specifying the electronic nature and the communication medium.

Explanations: Data communication specifically refers to the electronic transfer of data over a communication medium. This definition emphasizes the electronic nature of the data and the use of a communication medium, which is essential in the context of computer networks.

Option Analysis:

Option A: This option is incorrect because it does not specify the electronic nature of the data or the communication medium.
Option B: This option correctly defines data communication as the transfer of electronic data over a communication medium.
Option C: This option is too vague and does not specify the electronic nature of the data or the communication medium.
Option D: This option is incorrect as one of the other options provides the correct definition.

10. A device that connects to a network without the use of cables is said to be

Correct Answer: Correct answer is: (C) Wireless.

Exam Relevance: CCNA, CompTIA Network+, CIW Network Specialist

Difficulty: Easy

Concept notes: A device that connects to a network without the use of cables is said to be wireless.

Common Mistakes: A common misunderstanding is that wireless devices require some form of physical connection, such as a USB cable or an Ethernet cable, to connect to a network.

Explanations: Wireless devices use radio waves, infrared, or other non-cable methods to connect to a network. This allows for mobility and flexibility in network connectivity without the need for physical cables.

Option Analysis:

Option A: Distributed refers to a network architecture where components are spread across multiple locations, not the absence of cables.
Option B: Centralized refers to a network architecture where components are managed from a central location, not the absence of cables.
Option C: Wireless devices connect to a network without the use of cables, making this the correct answer.
Option D: Open source refers to software that is freely available and modifiable, not the absence of cables in network connectivity.

Frequently Asked Questions

What is the primary purpose of computer networks?

The primary purpose of computer networks is to enable resource sharing, communication, and data transmission between different devices and systems.

How does a modem facilitate internet connection?

A modem converts digital data from a computer into an analog signal for transmission over telephone lines, and vice versa, enabling internet connectivity.

What is the difference between a WAN and a Wi-Fi network?

A WAN (Wide Area Network) covers a large geographical area, such as a city or country, while Wi-Fi is a wireless network technology used for local area networks (LANs) to provide cable-free connectivity.

What is the role of a Storage Area Network (SAN) in data communication?

A Storage Area Network (SAN) is a high-speed network that provides block-level storage access to servers, facilitating efficient data storage and retrieval for multiple devices.

How do cellular networks support remote access?

Cellular networks use radio waves to provide mobile devices with wireless communication, enabling remote access to the internet and other network resources.

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