Computer networking MCQ – Change your future

781. The server program tells its TCP that it is ready to accept a connection. This process is called

Correct Answer: Correct answer is: (D) Passive open.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: In TCP/IP networking, a server prepares to accept incoming connections by listening on a specific port. This process is known as passive open.

Common Mistakes: Students often confuse passive open with active open, which is the process of initiating a connection from the client side.

Explanations: The server program tells its TCP that it is ready to accept a connection. This is a passive process because the server is not initiating the connection; it is simply preparing to accept one. This process is called passive open.

Option Analysis:

Option A: Active open is the process where a client initiates a connection to a server, not the server preparing to accept a connection.
Option B: Active close is the process where a client or server initiates the termination of a connection, not the server preparing to accept a connection.
Option C: Passive close is the process where a server or client waits for the other side to initiate the termination of a connection, not the server preparing to accept a connection.
Option D: Passive open is the correct term for the server preparing to accept a connection.

782. SONET defines..... layers.

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

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

Difficulty: Moderate

Concept notes: SONET (Synchronous Optical Network) defines four layers in its architecture.

Common Mistakes: Students may confuse the number of layers in SONET with other networking protocols or standards that have different layer structures.

Explanations: SONET defines four layers: the Physical Layer, the Section Layer, the Line Layer, and the Path Layer. Each layer has specific functions and responsibilities in the transmission and management of data over optical networks.

Option Analysis:

Option A: Incorrect, as SONET does not define only two layers.
Option B: Incorrect, as SONET does not define only three layers.
Option C: Correct, as SONET defines four layers.
Option D: Incorrect, as SONET does not define five layers.

783. The routing processor of a router performs the..... layer functions of the router.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The routing processor in a router is responsible for performing network layer functions, which include routing decisions and packet forwarding.

Common Mistakes: Students may confuse the routing processor with the data link layer functions, which are typically handled by the router's interface cards.

Explanations: The routing processor performs network layer functions, such as determining the best path for data packets to travel across a network. This involves maintaining routing tables and making decisions based on routing protocols. The physical and data link layer functions are generally handled by the router's interface cards, not the routing processor.

Option Analysis:

Option A: Incorrect, as the physical and data link layer functions are typically handled by the router's interface cards, not the routing processor.
Option B: Correct, as the routing processor is responsible for network layer functions, including routing decisions and packet forwarding.
Option C: Incorrect, as the transport layer functions are typically handled by the end devices, not the router's routing processor.
Option D: Incorrect, as the network layer functions are indeed performed by the routing processor.

784. Which of the following does UDP guarantee?

Correct Answer: Correct answer is: (D) None of the above.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: UDP (User Datagram Protocol) is a connectionless protocol that does not guarantee flow control, connection-oriented delivery, or reliability.

Common Mistakes: Students often confuse UDP with TCP (Transmission Control Protocol), which does provide flow control, connection-oriented delivery, and reliability.

Explanations: UDP is a connectionless protocol, meaning it does not establish a connection before sending data. It does not guarantee that packets will be delivered, delivered in the correct order, or that there will be no data loss. Therefore, UDP does not provide flow control, connection-oriented delivery, or reliability.

Option Analysis:

Option A: UDP does not provide flow control, which is a mechanism to prevent the sender from overwhelming the receiver with data.
Option B: UDP is connectionless, meaning it does not establish a connection before sending data, unlike connection-oriented protocols like TCP.
Option C: UDP does not guarantee reliability, as it does not ensure that packets are delivered or delivered in the correct order.
Option D: This is the correct answer because UDP does not guarantee any of the features listed in the other options.

785. What is the purpose of the HTTP protocol?

Correct Answer: Correct answer is: (C) It makes the transfer of a webpages from the servers to the user's device.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: The HTTP (Hypertext Transfer Protocol) is a protocol used for transferring data over the internet. It is primarily used to request and receive webpages from servers to the user's device.

Common Mistakes: Students may confuse HTTP with other protocols like FTP (File Transfer Protocol) or SMTP (Simple Mail Transfer Protocol), which have different purposes.

Explanations: HTTP is specifically designed to facilitate the transfer of webpages from servers to the user's device. It is not used for organizing files or processing HTML code, nor is it used for email communication. The 4 Layer model is related to network communication but is not the primary function of HTTP.

Option Analysis:

Option A: HTTP does not organize files or process HTML code; it is used for transferring webpages.
Option B: Email communication is handled by protocols like SMTP, not HTTP.
Option C: HTTP is used to transfer webpages from servers to the user's device, making this the correct answer.
Option D: The 4 Layer model is related to network communication but is not the primary function of HTTP.

Mnemonic: HTTP: Hyper Transfer, Pages to You

786. An interconnected collection of piconet is called

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

Exam Relevance: Computer Networks, Wireless Communication, Telecommunications

Difficulty: Easy

Concept notes: A scatternet is an interconnected collection of piconets in Bluetooth technology.

Common Mistakes: Students may confuse the term "scatternet" with "piconet," which refers to a single Bluetooth network.

Explanations: A piconet is a small network of Bluetooth devices, typically consisting of one master device and up to seven active slave devices. When multiple piconets are interconnected, forming a larger network, this interconnected collection is called a scatternet. This term accurately describes the structure of multiple piconets working together.

Option Analysis:

Option A: Correct. A scatternet is the correct term for an interconnected collection of piconets.
Option B: Incorrect. Micronet is not a standard term used in Bluetooth technology.
Option C: Incorrect. Mininet is not a standard term used in Bluetooth technology.
Option D: Incorrect. The correct term is provided in option A.

Mnemonic: S-CATTER-net: S for Scattered, C for Connected, T for Technology, T for Transmission, E for Extended, R for Radio.

787. What does the acronym ISDN stand for?

Correct Answer: Correct answer is: (B) Integrated Services Digital Network.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Very Easy

Concept notes: ISDN stands for Integrated Services Digital Network, which is a set of communication standards for sending voice, video, data, and other traffic over digital telephone lines or traditional telephone lines.

Common Mistakes: Students may confuse ISDN with other acronyms that start with "I" and "S," such as ISDN with ISDN (Indian Standard Digital Network), which is not a recognized term.

Explanations: ISDN is a telecommunications standard that integrates digital transmission of voice and data over ordinary telephone copper wire. The acronym ISDN stands for Integrated Services Digital Network, which accurately describes its function of integrating various services over a digital network.

Option Analysis:

Option A: Indian Standard Digital Network is not a recognized term for ISDN.
Option B: Integrated Services Digital Network is the correct expansion of ISDN.
Option C: Intelligent Services Digital Network is not the correct expansion of ISDN.
Option D: Integrated Services Data Network is not the correct expansion of ISDN.

788. What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable?

Correct Answer: Correct answer is: (C) Outer conductor.

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

Difficulty: Moderate

Concept notes: The outer conductor in coaxial cable acts as a shield, reducing the impact of external electromagnetic interference.

Common Mistakes: Students may confuse the function of the inner conductor with the shielding properties of the outer conductor.

Explanations: The outer conductor in coaxial cable serves as a shield, protecting the inner conductor from external electromagnetic interference. This shielding effect makes coaxial cable less susceptible to noise compared to twisted-pair cable, which lacks such a protective layer.

Option Analysis:

Option A: The inner conductor carries the signal but does not provide shielding.
Option B: The diameter of the cable does not directly contribute to noise reduction.
Option C: The outer conductor acts as a shield, reducing external interference.
Option D: The insulating material separates the inner and outer conductors but does not provide shielding.

Mnemonic: Shielded by C, Coaxial Cable.

789. A serially connected system of all the hubs of networks.

Correct Answer: Correct answer is: (C) Daisy chains.

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Moderate

Concept notes: Daisy chaining refers to the method of connecting multiple devices in a series, where each device is connected to the next in a linear fashion.

Common Mistakes: Students may confuse daisy chaining with other network topologies like bus or ring, which have different configurations.

Explanations: Daisy chaining is a method of connecting multiple devices in a series, where each device is connected to the next in a linear fashion. This is the correct term for a serially connected system of all the hubs of networks. The other options do not accurately describe this configuration.

Option Analysis:

Option A: Bus topology connects all devices to a single backbone cable, not in a serial fashion.
Option B: Ring topology connects devices in a closed loop, not in a serial fashion.
Option C: Daisy chaining connects devices in a serial fashion, which matches the description.
Option D: Star topology connects all devices to a central hub, not in a serial fashion.

Mnemonic: Daisy chains: Devices in a line, like daisies.

790. What does a Power over Ethernet (PoE) injector allow you to do?

Correct Answer: Correct answer is: (A) Enable a PoE-compliant device to connect to a non-PoE switch.

Exam Relevance: CCNA, CompTIA Network+, Cisco Certified Network Associate

Difficulty: Moderate

Concept notes: A Power over Ethernet (PoE) injector is a device that allows a PoE-compliant device to receive power and data over an Ethernet cable from a non-PoE switch.

Common Mistakes: Students may mistakenly believe that a PoE injector is used to connect a non-PoE device to a PoE switch, which is incorrect.

Explanations: A PoE injector is designed to inject power into an Ethernet cable, enabling a PoE-compliant device to receive both power and data from a non-PoE switch. This allows the PoE device to function properly without requiring a separate power source. The injector is placed between the non-PoE switch and the PoE device, ensuring that the device receives the necessary power and data.

Option Analysis:

Option A: Correct. A PoE injector enables a PoE-compliant device to connect to a non-PoE switch by providing the necessary power over the Ethernet cable.
Option B: Incorrect. A PoE injector does not enable a non-PoE-compliant device to connect to any type of switch. It specifically provides power to PoE-compliant devices.
Option C: Incorrect. A PoE injector does not amplify the voltage provided by a PoE switch; it injects power into the Ethernet cable for PoE-compliant devices.
Option D: Incorrect. A PoE injector does not inspect data packets; it is solely responsible for providing power over the Ethernet cable.

Mnemonic: PoE Injector: Power to PoE, Not to Non-PoE

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Computer networking MCQ - Set 79

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