Computer networking MCQ

1281. Application layer is also said to be a.....layer

Correct Answer: Correct answer is: (A) Service layer.

Exam Relevance: Networking exams, Computer Science exams, IT certifications

Difficulty: Easy

Concept notes: The application layer in the OSI model is often referred to as the service layer because it provides services directly to end-users and applications.

Common Mistakes: Students may confuse the application layer with other layers such as the transport layer, which is responsible for end-to-end communication.

Explanations: The application layer is the topmost layer in the OSI model and is responsible for providing services directly to end-users and applications. It includes functions such as file transfers, email, and web browsing. This layer is often called the service layer because it directly interacts with user applications and provides the necessary services for these applications to function.

Option Analysis:

Option A: Correct. The application layer is also known as the service layer because it provides services directly to end-users and applications.
Option B: Incorrect. The transport layer is responsible for end-to-end communication and is not the service layer.
Option C: Incorrect. The session layer manages sessions between applications and is not the service layer.
Option D: Incorrect. The abstraction layer is not a standard term in the OSI model.

1282. The network layer provides the services for

Correct Answer: Correct answer is: (D) Transport layer.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The network layer is responsible for providing services to the transport layer, which includes routing and addressing.

Common Mistakes: Students often confuse the network layer with the application layer, thinking it directly provides services to the end user.

Explanations: The network layer is responsible for providing services such as routing and addressing to the transport layer. The transport layer relies on the network layer to deliver data packets across different networks. The network layer ensures that data packets are correctly routed to their destination, which is a critical service for the transport layer to function effectively.

Option Analysis:

Option A: The application layer is the highest layer in the OSI model and does not directly receive services from the network layer.
Option B: The physical layer is the lowest layer and deals with the physical transmission of data, not providing services to higher layers.
Option C: The session layer manages sessions between applications, but it does not directly receive services from the network layer.
Option D: The transport layer relies on the network layer for routing and addressing services.

1283. All the nodes in each dimension form a linear array, in the

Correct Answer: Correct answer is: (A) Mesh topology.

Exam Relevance: Computer Networks, Data Communications, Network Design

Difficulty: Easy

Concept notes: In a mesh topology, nodes are interconnected in a grid-like structure, forming linear arrays in each dimension.

Common Mistakes: Students may confuse mesh topology with other topologies like bus or star, which do not form linear arrays in each dimension.

Explanations: In a mesh topology, each node is connected to its immediate neighbors in a grid-like structure. This results in linear arrays of nodes in each dimension. This characteristic distinguishes mesh topology from other topologies such as bus or star, where nodes are not arranged in a grid-like structure.

Option Analysis:

Option A: Correct. In a mesh topology, nodes form linear arrays in each dimension.
Option B: Incorrect. In a bus topology, nodes are connected to a single central cable, not forming linear arrays in each dimension.
Option C: Incorrect. In a star topology, nodes are connected to a central hub, not forming linear arrays in each dimension.
Option D: Incorrect. In a torus topology, nodes are connected in a circular grid, but this does not form linear arrays in each dimension in the same way as a mesh topology.

1284. A repeater receives a signal and before it becomes too weak or corrupted, regenerates original

Correct Answer: Correct answer is: (A) Bit pattern.

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

Difficulty: Moderate

Concept notes: A repeater regenerates the original bit pattern of a signal to maintain its integrity as it travels through a network.

Common Mistakes: Students may confuse the function of a repeater with that of other network devices like hubs or switches, which do not regenerate the signal.

Explanations: A repeater receives a signal and regenerates the original bit pattern to ensure the signal remains strong and clear as it travels through the network. This process prevents signal degradation and ensures data integrity. The other options (signals, segments, frames) do not accurately describe the specific function of a repeater in regenerating the original bit pattern.

Option Analysis:

Option A: Correct. A repeater regenerates the original bit pattern of the signal.
Option B: Incorrect. "Signals" is too broad and does not specify the regeneration of the bit pattern.
Option C: Incorrect. "Segments" refers to parts of a network, not the regeneration of the signal.
Option D: Incorrect. "Frames" are data units in a network, but a repeater does not regenerate frames specifically.

1285. Computers that request or order information from a server

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

Exam Relevance: AP Computer Science Principles, CompTIA Network+, CCNA

Difficulty: Easy

Concept notes: In a client-server model, a client is a computer or device that requests information or services from a server.

Common Mistakes: Students may confuse the roles of a client and a server, thinking that the server is the one requesting information.

Explanations: In a client-server architecture, the client initiates the communication by requesting information or services from the server. The server, in turn, processes the request and sends the requested information back to the client. Therefore, the correct term for computers that request or order information from a server is "client."

Option Analysis:

Option A: Correct. Clients request information from servers.
Option B: Incorrect. Servers provide information to clients.
Option C: Incorrect. Routers direct traffic between networks, not request information.
Option D: Incorrect. "Requester" is not a standard term in networking.

Mnemonic: C for Client, C for Communicator.

1286. In a network, when the load is below the capacity of the network, the throughput.....

Correct Answer: Correct answer is: (B) Increases proportionally with the load.

Exam Relevance: Computer Networks, Telecommunications, Network Engineering

Difficulty: Moderate

Concept notes: In a network, when the load is below the capacity, the throughput increases proportionally with the load. This is because the network resources are not fully utilized, and additional load can be handled without significant degradation in performance.

Common Mistakes: Students often misunderstand that network throughput can decline even when the load is below capacity, but this is incorrect under normal conditions.

Explanations: When the load is below the network's capacity, the network can efficiently handle the additional traffic. As a result, the throughput increases in direct proportion to the load. This relationship holds true until the network reaches its capacity, at which point the throughput may no longer increase proportionally due to congestion and resource limitations.

Option Analysis:

Option A: This is incorrect because a sharp increase in throughput is not typical for loads below the network's capacity.
Option B: This is correct because the throughput increases proportionally with the load when the network is not fully utilized.
Option C: This is incorrect because a sharp decline in throughput is not expected when the load is below the network's capacity.
Option D: This is incorrect because a proportional decline in throughput is not expected when the load is below the network's capacity.

1287. DNS client adds suffix atc.jhda.edu. before passing address to the

Correct Answer: Correct answer is: (B) DNS Server.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The DNS client appends the suffix to the address before sending it to the DNS server for resolution.

Common Mistakes: Students may mistakenly believe the DNS client handles the entire resolution process without involving the DNS server.

Explanations: The DNS client adds the suffix atc.jhda.edu. to the address before passing it to the DNS server. The DNS server then performs the actual resolution process to find the IP address associated with the fully qualified domain name.

Option Analysis:

Option A: Incorrect, as the DNS client does not resolve the address itself.
Option B: Correct, as the DNS server is responsible for resolving the address after the DNS client adds the suffix.
Option C: Incorrect, as DNS labels are components of domain names, not involved in the resolution process.
Option D: Incorrect, as there is no such term as "DNS Recipient" in DNS resolution.

Mnemonic: DNS: Server Solves

1288. The loss in signal power as light travels down the fiber is called

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

Exam Relevance: GATE, ECE, EE, Optical Communications Exams

Difficulty: Easy

Concept notes: Attenuation refers to the reduction in signal strength as light travels through a fiber optic cable.

Common Mistakes: Students may confuse attenuation with other phenomena such as scattering or interruption, which are different processes affecting signal transmission.

Explanations: Attenuation is the correct term for the loss of signal power as light propagates through the fiber. This loss can be due to absorption, scattering, or other factors that reduce the intensity of the light signal over distance.

Option Analysis:

Option A: Attenuation is the correct term for the loss of signal power in fiber optics.
Option B: Propagation refers to the transmission of the signal through the fiber, not the loss of power.
Option C: Scattering is a specific type of loss that can contribute to attenuation but is not the general term for signal loss.
Option D: Interruption refers to a complete break in signal transmission, not a gradual loss of power.

Mnemonic: A: Attenuation, Always Affects Amplitude.

1289. A combination of an encryption algorithm and a decryption algorithm is called a

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

Exam Relevance: Cryptography exams, Information Security exams, Computer Science exams

Difficulty: Easy

Concept notes: A cipher is a method of encrypting and decrypting information. It involves both the encryption algorithm, which converts plain text into ciphertext, and the decryption algorithm, which converts ciphertext back into plain text.

Common Mistakes: Students may confuse the term "cipher" with "plain text" or "original text," which refer to the unencrypted information, or "shift cipher," which is a specific type of cipher.

Explanations: A cipher is the combination of both the encryption and decryption algorithms. It is a comprehensive term that encompasses the entire process of converting plain text into ciphertext and back. The other options refer to either the unencrypted text or a specific type of cipher, not the general concept of encryption and decryption.

Option Analysis:

Option A: Plain text refers to the original, unencrypted message, not the combination of encryption and decryption algorithms.
Option B: Cipher is the correct term for the combination of encryption and decryption algorithms.
Option C: Original text is another term for plain text, which is the unencrypted message, not the combination of encryption and decryption algorithms.
Option D: Shift cipher is a specific type of cipher, not the general term for the combination of encryption and decryption algorithms.

1290. Which of the following devices is used to connect two networks which are different in terms of cable?

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

Exam Relevance: CCNA, Network+, CIW

Difficulty: Moderate

Concept notes: A bridge is a networking device that connects two different network segments at the data link layer (Layer 2) of the OSI model. It can handle different types of cables and protocols within the same network.

Common Mistakes: Students often confuse bridges with routers, which operate at the network layer (Layer 3) and are used to connect different networks, not just segments within the same network.

Explanations: A bridge is used to connect two different network segments within the same network. It operates at the data link layer (Layer 2) of the OSI model and can handle different types of cables and protocols. This makes it suitable for connecting two network segments that use different types of cables. A gateway or router, on the other hand, operates at higher layers and is used to connect different networks, not just segments within the same network.

Option Analysis:

Option A: A gateway is used to connect different networks and operates at higher layers of the OSI model, not just within the same network.
Option B: A bridge is used to connect two different network segments within the same network and can handle different types of cables and protocols.
Option C: A router is used to connect different networks and operates at the network layer (Layer 3) of the OSI model, not just within the same network.
Option D: This option is incorrect as a bridge is the correct device for connecting two different network segments within the same network.

Mnemonic: Bridge the gap within the same network.

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Computer networking MCQ - Set 129

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