Computer networking MCQ – Change your future

541. The OSI physical layer...

Correct Answer: Correct answer is: (B) Manages electrical, optical, and radio transmission of data bits.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: The OSI (Open Systems Interconnection) model's physical layer is responsible for the transmission of raw bit streams over a physical medium.

Common Mistakes: Students often confuse the physical layer with the data link layer, which deals with error correction and flow control.

Explanations: The physical layer of the OSI model is responsible for the transmission of raw bit streams over a physical medium. This includes managing the electrical, optical, and radio transmission of data bits. It does not handle segmentation, routing, or addressing, which are functions of higher layers in the OSI model.

Option Analysis:

Option A: This describes functions typically handled by the data link layer, not the physical layer.
Option B: This correctly describes the role of the physical layer in managing the transmission of data bits.
Option C: This describes functions typically handled by the data link layer, not the physical layer.
Option D: This describes functions typically handled by the network layer, not the physical layer.

542. Which layer does TCP operate on

Correct Answer: Correct answer is: (B) Transport.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: TCP (Transmission Control Protocol) operates at the Transport layer of the OSI model.

Common Mistakes: Students may confuse TCP with protocols that operate at other layers, such as IP at the Network layer.

Explanations: TCP is responsible for ensuring reliable data transfer between applications. It operates at the Transport layer, which is layer 4 of the OSI model. This layer is responsible for end-to-end communication and ensuring that data packets are delivered correctly and in order.

Option Analysis:

Option A: Incorrect. The Application layer (Layer 7) is where user applications interact with the network, not where TCP operates.
Option B: Correct. TCP operates at the Transport layer (Layer 4).
Option C: Incorrect. The Network layer (Layer 3) is responsible for routing and IP addressing, not for TCP.
Option D: Incorrect. The Link layer (Layer 2) deals with physical addressing and data transmission over a physical link, not with TCP.

543. Which of the following is a disadvantage of mesh topology over other network topologies?

Correct Answer: Correct answer is: (B) Expensive to install - more cabling required.

Exam Relevance: Computer Networks, Data Communications, Network Design Exams

Difficulty: Moderate

Concept notes: Mesh topology requires each node to be connected to every other node, leading to a higher cost due to the extensive cabling needed.

Common Mistakes: Students may confuse mesh topology with other topologies like star or ring, which do not require as much cabling.

Explanations: In a mesh topology, every node is directly connected to every other node, which results in a large number of connections and thus more cabling. This makes the installation more expensive compared to other topologies like bus, star, or ring, which require fewer connections and less cabling.

Option Analysis:

Option A: This is incorrect because in a mesh topology, the failure of one cable does not necessarily bring down the entire network due to multiple redundant paths.
Option B: This is correct because mesh topology requires each node to be connected to every other node, leading to a higher cost due to the extensive cabling needed.
Option C: This is incorrect because file size limitations are not a characteristic of mesh topology.
Option D: This is incorrect because data collisions are more likely in bus topology, not mesh topology.

544. Which if these terms refers to the maximum rate at which data can be transferred? (1-4)

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

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: Bandwidth refers to the maximum rate at which data can be transferred over a network or communication channel.

Common Mistakes: Students may confuse bandwidth with other network terms such as latency or throughput.

Explanations: Bandwidth is the correct term for the maximum rate at which data can be transferred. It defines the capacity of a communication channel to transmit data in a given time period, typically measured in bits per second (bps).

Option Analysis:

Option A: Error detection is a method used to identify errors in data transmission, not a measure of data transfer rate.
Option B: Packet switching is a method of data transmission where data is divided into packets and sent over a network, not a measure of data transfer rate.
Option C: Bandwidth is the correct term for the maximum rate at which data can be transferred.
Option D: Transmission media refers to the physical medium used to carry data, not a measure of data transfer rate.

545. Which one of the following terms refer to wireless radio communication?

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

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: Bluetooth is a wireless technology standard for exchanging data over short distances using radio waves.

Common Mistakes: Students may confuse Bluetooth with other wireless technologies or think it is related to bandwidth or GPS.

Explanations: Bluetooth is a wireless radio communication technology used for short-range data exchange between devices. It operates in the 2.4 GHz radio frequency band and is commonly used for connecting devices like smartphones, headphones, and computers. Bandwidth refers to the capacity of a communication channel, GPS is a satellite-based navigation system, and Ethernet is a wired networking technology.

Option Analysis:

Option A: Bluetooth is a wireless radio communication technology.
Option B: Bandwidth is the capacity of a communication channel, not a wireless radio communication technology.
Option C: GPS is a satellite-based navigation system, not a wireless radio communication technology.
Option D: Ethernet is a wired networking technology, not a wireless radio communication technology.

546. Which of the following is not a networking device?

Correct Answer: Correct answer is: (B) Linux.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: Networking devices are hardware components designed to facilitate communication between devices in a network. Linux, on the other hand, is an operating system and not a networking device.

Common Mistakes: Students may confuse Linux with networking devices because it can be used to configure and manage network devices.

Explanations: Linux is an operating system that can be used to run various applications, including network management tools. However, it is not a networking device itself. Networking devices include hardware such as routers, firewalls, and gateways, which are specifically designed to manage and direct network traffic.

Option Analysis:

Option A: Gateways are networking devices that connect different networks and route traffic between them.
Option B: Linux is an operating system, not a networking device.
Option C: Routers are networking devices that direct data packets between different networks.
Option D: Firewalls are networking devices that control network traffic based on security rules.

547. In a communication system, which among the following originate and accept messages in the form of data, information, and/or instructions?

Correct Answer: Correct answer is: (B) Sending and receiving devices.

Exam Relevance: Networking Fundamentals, Computer Science Exams, Telecommunications Exams

Difficulty: Easy

Concept notes: In a communication system, sending and receiving devices are responsible for originating and accepting messages in the form of data, information, and/or instructions.

Common Mistakes: Students may confuse communication channels with sending and receiving devices, as both are integral parts of a communication system.

Explanations: Sending and receiving devices are the endpoints in a communication system. They are responsible for generating and interpreting the messages. Communication channels, connection devices, and data transmission specifications are all components that facilitate the transfer of these messages but do not originate or accept them.

Option Analysis:

Option A: Communication channels are the pathways over which messages are transmitted, not the originators or acceptors of the messages.
Option B: Sending and receiving devices are the correct choice as they are responsible for originating and accepting messages.
Option C: Connection devices, such as routers and switches, facilitate the connection between different parts of the network but do not originate or accept messages.
Option D: Data transmission specifications define the rules for how data is transmitted but do not originate or accept messages.

548. A network can be a small collection of computers connected within a building or it can be a wide collection of computers connected around the world.

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

Exam Relevance: AP Computer Science Principles, SAT Subject Test in Computer Science

Difficulty: Easy

Concept notes: Networks can vary in size and scope, from small local networks to large global networks.

Common Mistakes: Students might think that all networks are large and global, overlooking the existence of small local networks.

Explanations: A network can be defined as a collection of interconnected devices that can communicate with each other. This definition encompasses both small networks, such as those found within a single building, and large networks, such as the Internet, which connects computers around the world. Therefore, the statement is true.

Option Analysis:

Option A: Correct, as networks can indeed vary in size from small local networks to large global networks.
Option B: Incorrect, as it contradicts the definition and scope of networks.

549. Singtel, Starhub & MyRepublic islandwide networks is an example of a ...

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

Exam Relevance: Networking Fundamentals, CCNA, CISSP

Difficulty: Moderate

Concept notes: Wide Area Network (WAN) refers to a network that spans a large geographical area, often connecting multiple Local Area Networks (LANs) or Metropolitan Area Networks (MANs) over long distances.

Common Mistakes: Students may confuse WAN with LAN or MAN, as all three are types of networks but differ in their geographical coverage.

Explanations: Singtel, Starhub, and MyRepublic are major telecommunications companies in Singapore that provide network services islandwide. An islandwide network covers a large geographical area, which aligns with the definition of a Wide Area Network (WAN). Therefore, the network provided by these companies is an example of a WAN.

Option Analysis:

Option A: LAN (Local Area Network) is incorrect because it typically covers a small geographical area, such as a single building or campus.
Option B: MAN (Metropolitan Area Network) is incorrect because it covers a larger area than a LAN but is still limited to a city or metropolitan area, not an entire island.
Option C: WAN (Wide Area Network) is correct because it covers a large geographical area, which fits the description of an islandwide network.

Mnemonic: WAN: Wide Area Network, "W" for "Worldwide" or "Wide"

550. What is meant by latency in the performance of a network?

Correct Answer: Correct answer is: (A) The amount of time data takes to travel from the source to the destination.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: Latency in network performance refers to the delay before a transfer of data begins following an instruction for its transfer.

Common Mistakes: Students often confuse latency with bandwidth, which is the maximum rate of data transfer.

Explanations: Latency is defined as the time it takes for data to travel from the source to the destination. This includes the time taken for the data to be processed, transmitted, and received. It is a critical measure of network performance, as it directly affects the responsiveness of the network.

Option Analysis:

Option A: This is the correct definition of latency.
Option B: This describes bandwidth, not latency.
Option C: This describes error rate, not latency.
Option D: This describes routing, not latency.

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Computer networking MCQ - Set 55

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