Computer networking MCQ

1191. Multicast link state routing uses source-based

Correct Answer: Correct answer is: (D) Tree approach.

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

Difficulty: Moderate

Concept notes: Multicast link state routing uses a tree approach to efficiently distribute data to multiple destinations.

Common Mistakes: Students may confuse the tree approach with other routing methods, such as unicast routing, which does not use a tree structure.

Explanations: In multicast link state routing, the network constructs a multicast tree to ensure that data packets are efficiently delivered to all intended recipients. This tree approach minimizes redundant transmissions and optimizes network resources. The tree structure allows for efficient forwarding of multicast packets from the source to all receivers, ensuring that each packet is sent only once along each link.

Option Analysis:

Option A: The root approach is not specific to multicast link state routing and does not describe the method used for distributing multicast data.
Option B: The node approach does not accurately describe the multicast routing method, as it does not focus on the tree structure necessary for efficient multicast distribution.
Option C: The domain approach is not relevant to the specific routing method used in multicast link state routing.
Option D: The tree approach correctly describes the method used in multicast link state routing to efficiently distribute data to multiple destinations.

Mnemonic: Tree for multicast, T for T.

1192. Most common unshielded twisted pair connector is

Correct Answer: Correct answer is: (A) RJ-45.

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

Difficulty: Easy

Concept notes: RJ-45 is the most common connector used for unshielded twisted pair (UTP) cables in Ethernet networks.

Common Mistakes: Students may confuse RJ-45 with other types of connectors like coaxial cable connectors (RG series).

Explanations: RJ-45 connectors are specifically designed for UTP cables and are widely used in Ethernet networks for data transmission. The other options (RG-59, RG-58, RG-ll) are types of coaxial cables, which are not used for UTP connections.

Option Analysis:

Option A: RJ-45 is the correct connector for UTP cables.
Option B: RG-59 is a coaxial cable used for cable television and video signals.
Option C: RG-58 is a coaxial cable used for older Ethernet networks and radio antenna connections.
Option D: RG-ll is a coaxial cable used for high-frequency applications like satellite TV.

Mnemonic: RJ-45: "RJ" for "Registered Jack," "45" for the number of pins.

1193. Which command will display all the EIGRP feasible successor routes known to a router?

Correct Answer: Correct answer is: (C) Show ip eigrp topology.

Exam Relevance: CCNA, CCNP, CCIE

Difficulty: Moderate

Concept notes: The EIGRP feasible successor routes are part of the EIGRP topology table, which contains all the routes known to the router, including both feasible successors and successors.

Common Mistakes: Students may confuse the feasible successor routes with the active routes, which are displayed by the "show ip eigrp summary" command.

Explanations: The "show ip eigrp topology" command displays all the routes known to the router, including feasible successors and successors. Feasible successors are backup routes that can be used if the primary route (successor) fails. The topology table contains all these routes, making this command the correct choice to display all feasible successor routes.

Option Analysis:

Option A: The "show ip routes *" command displays all routes in the routing table, not specifically the feasible successors in the EIGRP topology table.
Option B: The "show ip eigrp summary" command displays a summary of EIGRP neighbors and interfaces, not the feasible successor routes.
Option C: The "show ip eigrp topology" command displays all routes known to the router, including feasible successors and successors, making it the correct choice.
Option D: The "show ip eigrp adjacencies" command displays the EIGRP neighbors and their status, not the feasible successor routes.

1194. CATEGORY IN TWISTED PAIR CABLE??

Correct Answer: Correct answer is: (C) UTP,STP.

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

Difficulty: Easy

Concept notes: Twisted pair cables are categorized into Unshielded Twisted Pair (UTP) and Shielded Twisted Pair (STP).

Common Mistakes: Students may confuse UTP and STP with other types of cables, such as coaxial cables (THIN NET, THICK NET).

Explanations: Twisted pair cables are commonly classified into two main categories: Unshielded Twisted Pair (UTP) and Shielded Twisted Pair (STP). UTP cables do not have any shielding, while STP cables have a layer of shielding to reduce electromagnetic interference. The other options (FTP, NTP, THIN NET, THICK NET) are not categories of twisted pair cables.

Option Analysis:

Option A: FTP (Foiled Twisted Pair) and NTP (Not Twisted Pair) are not standard categories for twisted pair cables.
Option B: THIN NET and THICK NET are types of coaxial cables, not twisted pair cables.
Option C: UTP (Unshielded Twisted Pair) and STP (Shielded Twisted Pair) are the correct categories for twisted pair cables.
Option D: This option is incorrect as UTP and STP are valid categories.

1195. The..... layer is roughly equivalent to the MAC sub layer in bluetooth.

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

Exam Relevance: Computer Networks, Wireless Communications, Bluetooth Protocol

Difficulty: Moderate

Concept notes: The baseband layer in Bluetooth is responsible for the physical and link layer functionalities, including the MAC sub-layer.

Common Mistakes: Students may confuse the baseband layer with the L2CAP layer, which operates at a higher level and is responsible for segmentation and reassembly of data.

Explanations: The baseband layer in Bluetooth is responsible for the physical and link layer functionalities, including the MAC sub-layer. The MAC sub-layer is responsible for managing access to the physical medium, which aligns with the responsibilities of the baseband layer. Therefore, the baseband layer is roughly equivalent to the MAC sub-layer in Bluetooth.

Option Analysis:

Option A: L2CAP is a higher-level protocol responsible for segmentation and reassembly of data, not the MAC sub-layer.
Option B: The radio layer is responsible for the physical transmission of data, not the MAC sub-layer.
Option C: The baseband layer includes the MAC sub-layer functionalities, making it the correct answer.
Option D: This option is incorrect as the baseband layer is the correct answer.

Mnemonic: Baseband = MAC

1196. The function of DSLAM is

Correct Answer: Correct answer is: (A) Convert analog signals into digital signals.

Exam Relevance: Computer Networks, Telecommunications, Data Communications

Difficulty: Moderate

Concept notes: The Digital Subscriber Line Access Multiplexer (DSLAM) is a device used in digital subscriber line (DSL) technology to convert analog signals from the telephone line into digital signals for transmission over a digital network.

Common Mistakes: Students often confuse the function of DSLAM with that of a modem, which can also convert signals but operates differently in a network setup.

Explanations: DSLAM is a key component in DSL technology that converts analog signals from the telephone line into digital signals. This conversion is necessary because the telephone lines carry analog signals, but the data needs to be in digital form to be transmitted over the internet. The DSLAM performs this conversion at the central office, enabling the transmission of digital data over the existing telephone infrastructure.

Option Analysis:

Option A: Correct. DSLAM converts analog signals into digital signals.
Option B: Incorrect. This is the function of a modem, not DSLAM.
Option C: Incorrect. Amplifying digital signals is not the primary function of DSLAM.
Option D: Incorrect. The correct function is described in Option A.

1197. A cyberattack carried out by sending emails to large numbers of people asking for sensitive information

Correct Answer: Correct answer is: (D) Phishing.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: Phishing is a cyberattack method where attackers send emails to many people to trick them into revealing sensitive information.

Common Mistakes: Students may confuse phishing with other cyberattacks like ransomware or malware, which involve different methods of attack.

Explanations: Phishing involves sending emails to a large number of people with the intent of tricking them into providing sensitive information such as passwords or financial details. This matches the description given in the question.

Option Analysis:

Option A: Cryptography is the practice of securing communication from unauthorized access, not a method of cyberattack.
Option B: Authentication is the process of verifying the identity of a user, not a method of cyberattack.
Option C: Encryption is the process of converting information into a secure code to prevent unauthorized access, not a method of cyberattack.
Option D: Phishing is a cyberattack method that involves sending emails to trick people into revealing sensitive information.

1198. In a computer, height of wave within given period of time is known as

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

Exam Relevance: Physics exams, Electronics exams, Computer Science exams

Difficulty: Easy

Concept notes: Amplitude refers to the height of a wave, which is the maximum displacement of the wave from its equilibrium position.

Common Mistakes: Students may confuse amplitude with frequency, which is the number of wave cycles per unit time.

Explanations: Amplitude is the measure of the height of a wave. In the context of a computer, the amplitude of a wave within a given period of time represents the maximum deviation of the wave from its baseline. This is why the correct answer is amplitude.

Option Analysis:

Option A: Frequency is the number of wave cycles per unit time, not the height of the wave.
Option B: Amplitude is the correct term for the height of a wave.
Option C: Oscillation refers to the repetitive variation, typically in time, of some measure about a central value or between two or more different states, but it does not specifically refer to the height of a wave.
Option D: Pulse refers to a single, brief burst of energy, not the height of a wave.

Mnemonic: A: Amplitude, Always the height.

1199. In Unicast Routing, Dijkstra algorithm creates a shortest path tree from a

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

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

Difficulty: Easy

Concept notes: Dijkstra's algorithm is used to find the shortest path in a graph from a single source node to all other nodes.

Common Mistakes: Students may confuse the input of Dijkstra's algorithm with a tree or network, but the algorithm operates on a graph.

Explanations: Dijkstra's algorithm operates on a graph, which is a collection of nodes (vertices) and edges connecting these nodes. The algorithm starts from a source node and calculates the shortest path to all other nodes in the graph. A graph is the fundamental structure that Dijkstra's algorithm uses to find the shortest path tree.

Option Analysis:

Option A: Correct. Dijkstra's algorithm operates on a graph to find the shortest path tree.
Option B: Incorrect. A tree is a type of graph, but Dijkstra's algorithm specifically operates on a graph, not just a tree.
Option C: Incorrect. A network is a more general term and can refer to various structures, but Dijkstra's algorithm specifically requires a graph as input.
Option D: Incorrect. A link is an edge in a graph, but Dijkstra's algorithm operates on the entire graph, not just a single link.

Mnemonic: Graphs, not trees, for Dijkstra's paths.

1200. The standard suit of protocols used by the Internet, intranets, extranets, and some other networks.

Correct Answer: Correct answer is: (A) TCP/IP.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: TCP/IP stands for Transmission Control Protocol/Internet Protocol. It is the standard suite of protocols used for communication over the Internet and other networks.

Common Mistakes: Students may confuse TCP/IP with other protocols or networking terms, such as OSI model or HTTP.

Explanations: TCP/IP is the correct answer because it is the standard suite of protocols used by the Internet, intranets, extranets, and some other networks. It provides the rules and standards for data transmission and ensures reliable communication between different devices and systems.

Option Analysis:

Option A: Correct. TCP/IP is the standard suite of protocols used by the Internet and other networks.
Option B: Incorrect. "Protocol" is a general term and does not specify the standard suite used by the Internet.
Option C: Incorrect. "Open Systems" refers to a concept in networking but is not the specific suite of protocols used by the Internet.
Option D: Incorrect. "Internetwork processor" is a component in networking but not the suite of protocols used by the Internet.

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Computer networking MCQ - Set 120

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