Computer networking MCQ

921. Consider the following Statements: In a bus network, all workstations (computers) servers and printers are connected to one cable. A network is composed of a variety of computers and peripheral devices that support input and output, save and serve data, and manage communication protocols. Comcast Infinity is an ISP. Which of the following statement(s) is/are true?

Correct Answer: Correct answer is: (C) Only 1, 2, 3.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Moderate

Concept notes: In a bus network, all devices are connected to a single cable. A network includes various devices such as computers, servers, and printers that support input/output, data storage, and communication protocols. Comcast Infinity is an Internet Service Provider (ISP).

Common Mistakes: Students may incorrectly assume that only one or two of the statements are true, overlooking the comprehensive nature of network components and the role of ISPs.

Explanations: Statement 1 is true because in a bus network, all workstations, servers, and printers are connected to a single cable. Statement 2 is true as a network indeed consists of various devices that support input/output, data storage, and communication protocols. Statement 3 is true because Comcast Infinity is an ISP that provides internet services. Therefore, all three statements are correct.

Option Analysis:

Option A: Incorrect because it omits statement 3.
Option B: Incorrect because it omits statement 2.
Option C: Correct because it includes all three true statements.
Option D: Incorrect because it omits statement 1.

Mnemonic: Bus, Network, ISP

922. An OSPF router receives an LSA. The router checks its sequence number and finds that this number is lower than the sequence number it already has. What does the router do with the LSA?

Correct Answer: Correct answer is: (C) Sends newer LSU update to source router.

Exam Relevance: CCNA, CCNP, JNCIA, JNCIS

Difficulty: Moderate

Concept notes: In OSPF, when a router receives an LSA with a lower sequence number than the one it already has, it sends a newer LSU (Link State Update) back to the source router to ensure the network has the most up-to-date information.

Common Mistakes: A common mistake is to assume that the router would ignore the LSA or flood it to other routers, but the correct action is to send a newer LSU to the source router.

Explanations: When an OSPF router receives an LSA with a lower sequence number, it recognizes that the LSA is outdated. The router then sends a newer LSU to the source router to ensure that the source router has the most recent information. This prevents the propagation of outdated LSAs and maintains the accuracy of the routing information.

Option Analysis:

Option A: Incorrect. The router does not ignore the LSA; it takes action to update the source router.
Option B: Incorrect. The router does not add the outdated LSA to its database; it sends a newer LSU to the source router.
Option C: Correct. The router sends a newer LSU to the source router to ensure the network has the most up-to-date information.
Option D: Incorrect. The router does not flood the outdated LSA to other routers; it sends a newer LSU to the source router.

923. A .....network is a network topology with each node being interconnected.

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

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Moderate

Concept notes: In a mesh network, each node is interconnected with every other node, providing multiple paths for data transmission.

Common Mistakes: Students may confuse mesh networks with ring networks, where nodes are connected in a circular fashion, or with star networks, where nodes connect to a central hub.

Explanations: A mesh network topology ensures that each node is directly connected to every other node. This design provides redundancy and robustness, as data can be transmitted through multiple paths. The interconnected nature of a mesh network makes it distinct from other topologies like star, tree, or ring, where nodes are not directly connected to all other nodes.

Option Analysis:

Option A: In a star network, nodes are connected to a central hub, not directly to each other.
Option B: In a tree network, nodes are connected in a hierarchical structure, not directly to all other nodes.
Option C: In a mesh network, each node is interconnected with every other node, fitting the description given in the question.
Option D: In a ring network, nodes are connected in a circular fashion, not directly to all other nodes.

Mnemonic: Mnemonic: Mesh = Many paths, each to every.

924. Is a higher-level idea of how the network is set up, including which nodes connect to each other and in which ways, as well as how data is transmitted through the network.

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

Exam Relevance: CCNA, Network+, CIW

Difficulty: Moderate

Concept notes: Logical Network Topology refers to the way data flows and is organized within a network, independent of the physical layout of the network devices.

Common Mistakes: Students often confuse Logical Network Topology with Physical Network Topology, which deals with the physical layout of the network devices.

Explanations: Logical Network Topology describes the higher-level idea of how the network is set up, including which nodes connect to each other and in which ways, as well as how data is transmitted through the network. This is distinct from the physical layout of the network devices, which is the focus of Physical Network Topology.

Option Analysis:

Option A: Correct. Logical Network Topology is the correct term for the higher-level idea of how the network is set up, including data flow and organization.
Option B: Incorrect. "Planned Network" is not a standard term in network design and does not specifically refer to the logical structure of a network.
Option C: Incorrect. Physical Network Topology refers to the physical layout of the network devices, not the logical flow of data.
Option D: Incorrect. "Hardware Network" is not a standard term and does not describe the logical structure of a network.

925. Which of the following is used to describe taking everyday items and connecting them to the internet?

Correct Answer: Correct answer is: (C) Internet of Things.

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

Difficulty: Easy

Concept notes: The Internet of Things (IoT) refers to the network of physical objects or "things" embedded with sensors, software, and connectivity that enables them to collect and exchange data.

Common Mistakes: Students may confuse the term "Internet of Things" with "Smart Devices," which are a subset of IoT but do not encompass the broader concept of connecting everyday items to the internet.

Explanations: The term "Internet of Things" accurately describes the concept of connecting everyday items to the internet. This network of connected devices can communicate and exchange data, enhancing functionality and efficiency in various applications.

Option Analysis:

Option A: "Web of Items" is not a standard term used to describe the concept of connecting everyday items to the internet.
Option B: "Online Devices" is a broad term that does not specifically refer to the concept of connecting everyday items to the internet.
Option C: "Internet of Things" is the correct term used to describe the concept of connecting everyday items to the internet.
Option D: "Smart Devices" refers to devices that are internet-connected and can perform tasks autonomously, but it does not encompass the broader concept of IoT.

Mnemonic: IoT: Internet of Things, Think of Things Connected

926. An ISP has requested a block of 1000 addresses. How many blocks are granted to it?

Correct Answer: Correct answer is: (C) 1024.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: In IP addressing, blocks are typically granted in powers of two. The closest power of two greater than or equal to 1000 is 1024.

Common Mistakes: Students may mistakenly choose 1000, thinking the ISP will be granted exactly 1000 addresses, without considering the standard practice of granting blocks in powers of two.

Explanations: ISP address allocation follows the principle of granting blocks in powers of two. Since 1000 is not a power of two, the ISP would be granted the next highest power of two, which is 1024. This ensures efficient allocation and management of IP addresses.

Option Analysis:

Option A: 512 is a power of two but is less than 1000, so it is insufficient.
Option B: 1000 is not a power of two, so it is not a standard block size.
Option C: 1024 is the next power of two greater than 1000, making it the correct block size.
Option D: None of the mentioned is incorrect as 1024 is a valid option.

Mnemonic: Think "1024" as "1K plus 24" for easy recall.

927. Regulations set up to help the transfer of information between devices. They are rules for communication between the computers and servers.

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

Exam Relevance: CISSP, CCNA, Network+

Difficulty: Easy

Concept notes: Network protocols are sets of rules that govern how data is transmitted and received over a network. They ensure that devices can communicate effectively and efficiently.

Common Mistakes: Students may confuse network protocols with other network components like firewalls or bandwidth, which serve different purposes.

Explanations: Network protocols are specifically designed to facilitate the transfer of information between devices. They define the rules for communication, ensuring that data packets are sent and received correctly. This makes them the correct answer as they directly address the regulation of information transfer.

Option Analysis:

Option A: Network Protocol is the correct answer as it defines the rules for communication between devices.
Option B: Bandwidth refers to the capacity of a network to transmit data, not the rules for communication.
Option C: Firewalls are security measures that control access to networks, not rules for communication.
Option D: Latency refers to the delay in data transmission, not the rules for communication.

928. The term modem is a composite word that refers to the two functional entities that make up the device: a signal..... and a signal.....

Correct Answer: Correct answer is: (A) Modulator; demodulator.

Exam Relevance: Networking exams, Computer Science exams, Telecommunications exams

Difficulty: Easy

Concept notes: The term "modem" is derived from the combination of "modulator" and "demodulator."

Common Mistakes: Students may confuse the order of the terms or think "modem" is related to modern technology.

Explanations: A modem is a device that converts digital signals into analog signals for transmission over analog networks (modulation) and converts received analog signals back into digital signals (demodulation). The term "modem" is a portmanteau of "modulator" and "demodulator," reflecting these two key functions.

Option Analysis:

Option A: Correct. Modulator and demodulator are the correct terms.
Option B: Incorrect. The order is reversed.
Option C: Incorrect. "Modern" and "demo" are not related to the functions of a modem.
Option D: Incorrect. The correct answer is provided in option A.

Mnemonic: Modem: MoDulator and DeModulator

929. Any portion of a network that is separated (by a switch, bridge, or router) from other parts of the network.

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

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Easy

Concept notes: A segment is a portion of a network that is separated from other parts of the network by devices such as switches, bridges, or routers.

Common Mistakes: Students may confuse a segment with a backbone, which is the main network that connects different segments or subnetworks.

Explanations: A segment is a part of a network that is isolated from other parts by network devices like switches, bridges, or routers. This isolation helps in managing traffic and improving network performance. The term "segment" accurately describes this isolated portion of the network.

Option Analysis:

Option A: Correct. A segment is a portion of a network that is separated from other parts of the network by devices such as switches, bridges, or routers.
Option B: Incorrect. A backbone is the main network that connects different segments or subnetworks, not a portion of a network that is separated from other parts.
Option C: Incorrect. A hub is a device that connects multiple devices on a network but does not create segments; it broadcasts data to all connected devices.
Option D: Incorrect. A bus is a type of network topology where all devices are connected to a single cable, not a portion of a network that is separated from other parts.

930. Internet users use the

Correct Answer: Correct answer is: (D) Point to Point Protocol.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The Point to Point Protocol (PPP) is a data link layer protocol used for transporting network layer protocols over point-to-point links, commonly used in Internet connections.

Common Mistakes: Students may confuse PPP with other protocols like HDLC or PAP, which are also related to data link layer communication but serve different purposes.

Explanations: Internet users use the Point to Point Protocol (PPP) to establish a direct connection between two nodes over a serial interface. PPP is widely used for dial-up and dedicated connections to the Internet. It provides a standard method for transporting multi-protocol datagrams over point-to-point links, making it a fundamental protocol for Internet connectivity.

Option Analysis:

Option A: High-level Data Link Control (HDLC) is a bit-oriented synchronous data link layer protocol, but it is not commonly used by Internet users for direct Internet connectivity.
Option B: Password Authentication Protocol (PAP) is a method for authentication, not a protocol for establishing a connection.
Option C: Multipoint Protocol (MP) is not a standard protocol used by Internet users for establishing connections.
Option D: Point to Point Protocol (PPP) is the correct choice as it is widely used by Internet users to establish a direct connection to the Internet.

Mnemonic: PPP: Point to Point Protocol, Perfect for Personal Internet

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Computer networking MCQ - Set 93

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