Computer networking MCQ – Change your future

551. The capacity of a communication channel is measured in .....

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

Exam Relevance: EECE, ECE, Telecommunications Engineering

Difficulty: Moderate

Concept notes: The capacity of a communication channel is often measured in terms of bandwidth, which is the range of frequencies that a channel can transmit.

Common Mistakes: Students often confuse bandwidth with bit capacity, which is a measure of the amount of data that can be transmitted in a given time.

Explanations: Bandwidth is the correct measure of a communication channel's capacity because it defines the range of frequencies that can be transmitted over the channel. This range directly impacts the amount of data that can be transmitted within a given time frame, making it a fundamental measure of channel capacity.

Option Analysis:

Option A: Correct. Bandwidth is the range of frequencies that a channel can transmit, which is a measure of the channel's capacity.
Option B: Incorrect. Bit capacity refers to the amount of data that can be transmitted in a given time, not the channel's capacity.
Option C: Incorrect. Band rate is not a standard term used to measure channel capacity.
Option D: Incorrect. Data flow refers to the movement of data through a system, not the channel's capacity.

552. What is the purpose of a Router in a home network?

Correct Answer: Correct answer is: (D) All of the above.

Exam Relevance: CCNA, CompTIA Network+, A+ Certification

Difficulty: Moderate

Concept notes: A router in a home network serves multiple functions, including connecting devices to the internet, supporting both wireless and wired connections, and allowing devices to share files and data.

Common Mistakes: Students may overlook the router's ability to support both wireless and wired connections, focusing only on its internet connectivity function.

Explanations: A router in a home network can support both wireless and wired device connections, allowing devices to connect to the internet. Additionally, it enables devices to share files and data within the local network. Therefore, the correct answer is that all of the above functions are true for a router.

Option Analysis:

Option A: A router can support both wireless and wired device connections, which is a key function.
Option B: A router can connect devices to the internet, which is one of its primary roles.
Option C: A router can allow devices to share files and data within the local network, which is another important function.
Option D: Since all the above statements are true, the correct answer is "All of the above."

Mnemonic: R-WiFi-Wired-Internet-Share

553. 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.

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

Exam Relevance: Computer Networks, IT Fundamentals, Network Security

Difficulty: Easy

Concept notes: A network is a system of interconnected devices that facilitate communication and data exchange. These devices include computers, servers, and peripheral devices such as printers and scanners.

Common Mistakes: Students might think that a network only consists of computers and overlook the role of peripheral devices and servers.

Explanations: A network is composed of various devices that support input and output, save and serve data, and manage communication protocols. This includes computers, servers, and peripheral devices like printers and scanners. Therefore, the statement is true.

Option Analysis:

Option A: Correct, as the statement accurately describes the components of a network.
Option B: Incorrect, as the statement is accurate and does not contradict the definition of a network.

554. Identify the parts of a computer network.

Correct Answer: Correct answer is: (B) Workstations, Server, Modem, Router.

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

Difficulty: Moderate

Concept notes: The parts of a computer network include hardware components that facilitate communication and data transfer.

Common Mistakes: Students may confuse the types of networks (PAN, LAN, MAN, WAN) with the components that make up a network.

Explanations: Workstations, servers, modems, and routers are essential components of a computer network. Workstations are individual computers used by users. Servers provide services and resources to the network. Modems enable the connection to external networks, such as the internet. Routers direct data traffic between different network segments.

Option Analysis:

Option A: This option lists types of networks, not the components of a network.
Option B: This option correctly identifies the hardware components that make up a computer network.
Option C: This option describes the basic functions of a computer system, not the components of a network.

Mnemonic: W-S-M-R: Workstations, Servers, Modems, Routers

555. In this type of topology all computers are connected to a central device called hub or switch

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

Exam Relevance: CCNA, Network+ Certification, CompTIA A+

Difficulty: Easy

Concept notes: In a star topology, all devices are connected to a central hub or switch.

Common Mistakes: Students may confuse the star topology with the bus topology, where devices are connected to a single backbone cable.

Explanations: In a star topology, each device is directly connected to a central hub or switch. This central device acts as a conduit for all messages. This configuration allows for easy troubleshooting and isolation of faulty devices, as each device has a direct line to the central hub.

Option Analysis:

Option A: Bus topology connects all devices to a single backbone cable, not a central hub or switch.
Option B: Ring topology connects devices in a circular configuration, with each device connected to two others.
Option C: Star topology connects all devices to a central hub or switch, which is the correct description.
Option D: Mesh topology connects each device to every other device, creating a highly redundant network.

Mnemonic: Star = Central Hub

556. Which multiple access technique is used by IEEE 802.11 standard for wireless LAN?

Correct Answer: Correct answer is: (B) CSMA/CA.

Exam Relevance: Computer Networks, Wireless Communication, IEEE Standards

Difficulty: Easy

Concept notes: The IEEE 802.11 standard for wireless LANs uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) as its multiple access technique.

Common Mistakes: Students may confuse CSMA/CA with CSMA/CD, which is used in wired Ethernet networks.

Explanations: CSMA/CA is used in IEEE 802.11 because it is designed to avoid collisions in wireless networks, where detecting collisions is difficult due to the hidden node problem. In CSMA/CA, a node listens to the channel before transmitting and waits for a clear channel. It also uses a random backoff time to further reduce the chance of collisions.

Option Analysis:

Option A: CDMA is not used in IEEE 802.11 for wireless LANs.
Option B: CSMA/CA is the correct multiple access technique used in IEEE 802.11.
Option C: ALOHA is an older multiple access technique and is not used in IEEE 802.11.
Option D: This option is incorrect as CSMA/CA is the correct technique used.

557. Given are the two statements about TCP/UDP. I) TCP is connection oriented and is not reliable, meaning, you cannot be sure that your packets arrive. II) UDP is Message oriented and should be used e.g. for video live streaming

Correct Answer: Correct answer is: (D) I is incorrect and II is correct.

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Moderate

Concept notes: TCP is connection-oriented and reliable, ensuring that packets arrive in the correct order. UDP is message-oriented and unreliable, making it suitable for applications like video streaming where some packet loss is acceptable.

Common Mistakes: Students often confuse the reliability and connection-oriented nature of TCP with UDP, leading to incorrect assumptions about their usage.

Explanations: TCP is connection-oriented and reliable, meaning it ensures that packets are delivered in the correct order and without loss. UDP, on the other hand, is message-oriented and unreliable, making it suitable for applications like video streaming where some packet loss is acceptable and retransmission is not feasible.

Option Analysis:

Option A: Incorrect because both statements are not incorrect.
Option B: Incorrect because both statements are not correct.
Option C: Incorrect because the first statement is incorrect and the second statement is correct.
Option D: Correct because the first statement is incorrect and the second statement is correct.

Mnemonic: TCP: Trusty, Connected, Packets UDP: Unreliable, Data Packets

558. The signals attached are most likely considered

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

Exam Relevance: GATE, GRE, ECE Exams

Difficulty: Moderate

Concept notes: Wireless signals refer to electromagnetic waves that transmit information without the use of wires or cables.

Common Mistakes: Students may confuse wireless signals with other forms of electromagnetic radiation, such as lightning or light, which are not used for communication.

Explanations: Wireless signals are a form of electromagnetic radiation used for communication, such as radio waves, microwaves, and infrared. These signals do not require physical connections like wires to transmit data, making them distinct from wired communication methods. The signals attached are most likely considered wireless because they are likely electromagnetic waves used for communication purposes.

Option Analysis:

Option A: Lightning is a natural electrical discharge and not a form of communication signal.
Option B: Lights are used for illumination and not for transmitting information.
Option C: Wireless signals are used for communication without physical connections.
Option D: Non-wireless signals would require physical connections, which is not the case here.

559. UTP stands for?

Correct Answer: Correct answer is: (C) Unshielded Twisted Pair.

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

Difficulty: Very Easy

Concept notes: UTP stands for Unshielded Twisted Pair, which is a type of cable used in telecommunications and networking.

Common Mistakes: Students may confuse UTP with other types of cables, such as STP (Shielded Twisted Pair), leading to incorrect answers.

Explanations: UTP is a type of cable that consists of pairs of wires twisted together without any shielding. This design helps reduce crosstalk and electromagnetic interference. The term "Unshielded Twisted Pair" accurately describes the construction and function of the cable.

Option Analysis:

Option A: Unique Twister Pair is not a standard term used in networking or telecommunications.
Option B: Upgraded Twisted Pair is not a recognized term in the context of cable types.
Option C: Unshielded Twisted Pair is the correct term for the cable type described.
Option D: Unshielded Tight Pair is not a standard term used in networking or telecommunications.

560. A short-range radio communication standard that transmits data over short distances of up to approximately 33 feet.

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

Exam Relevance: IT Essentials, CompTIA A+, Network+

Difficulty: Easy

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

Common Mistakes: Students may confuse Bluetooth with other wireless technologies like Wi-Fi, which operates over longer distances.

Explanations: Bluetooth is designed for short-range communication, typically up to 33 feet (10 meters). It is commonly used for connecting devices such as headphones, speakers, and smartphones. The other options (Broadband, DSL, TCP/IP) are not short-range radio communication standards.

Option Analysis:

Option A: Broadband is a high-speed internet connection, not a short-range radio communication standard.
Option B: DSL (Digital Subscriber Line) is a technology for bringing high-bandwidth information to homes and small businesses over ordinary copper telephone lines, not a short-range radio communication standard.
Option C: Bluetooth is a short-range radio communication standard that transmits data over short distances, up to approximately 33 feet.
Option D: TCP/IP (Transmission Control Protocol/Internet Protocol) is a suite of communication protocols used to interconnect network devices on the internet, not a short-range radio communication standard.

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Computer networking MCQ - Set 56

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