Computer networking MCQ – Change your future

371. Logic Link Control (LLC) defines a

Correct Answer: Correct answer is: (A) Protocol Data Unit.

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Moderate

Concept notes: Logic Link Control (LLC) is a sublayer of the data link layer in the OSI model. It defines the Protocol Data Unit (PDU) which is used for communication between devices.

Common Mistakes: Students often confuse LLC with other layers or sublayers in the OSI model, such as the High-level Data Link Control (HDLC), which is a different protocol.

Explanations: LLC defines the Protocol Data Unit (PDU) which is the unit of data that is transmitted between two devices at the data link layer. The PDU includes control information and the actual data payload. This is why the correct answer is the Protocol Data Unit.

Option Analysis:

Option A: Correct. LLC defines the Protocol Data Unit (PDU).
Option B: Incorrect. Destination Service Access Point (DSAP) is part of the address field in the LLC header, not the PDU itself.
Option C: Incorrect. Source Service Access Point (SSAP) is also part of the address field in the LLC header, not the PDU itself.
Option D: Incorrect. High-level Data Link Control (HDLC) is a different protocol and not related to defining the PDU in LLC.

372. Range of frequencies a channel can pass is called bandwidth in

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

Exam Relevance: EE, ECE, Telecommunications Engineering

Difficulty: Easy

Concept notes: Bandwidth refers to the range of frequencies that a channel can pass, and it is measured in Hertz (Hz).

Common Mistakes: Students may confuse bandwidth with data rate, which is measured in bits per second.

Explanations: Bandwidth is defined as the range of frequencies that a channel can transmit. This range is measured in Hertz (Hz), which is the unit of frequency. Therefore, the correct answer is Hertz.

Option Analysis:

Option A: Bits per second is a measure of data rate, not bandwidth.
Option B: Hertz is the correct unit for measuring bandwidth, which is the range of frequencies a channel can pass.
Option C: Kilogram is a unit of mass, not related to frequency or bandwidth.
Option D: Nanosecond is a unit of time, not related to frequency or bandwidth.

373. In Ring network, UPSR uses 2 rings for working lines and BLSR uses

Correct Answer: Correct answer is: (A) 4 rings.

Exam Relevance: Computer Networks, Telecommunications, Network Engineering

Difficulty: Moderate

Concept notes: In a BLSR (Bidirectional Line Switched Ring) configuration, two rings are used for working traffic, and two additional rings are used for protection, making a total of four rings.

Common Mistakes: Students often confuse BLSR with UPSR (Unidirectional Path Switched Ring), which uses only two rings, one for working and one for protection.

Explanations: BLSR uses a total of four rings: two for working traffic and two for protection. This configuration allows for bidirectional traffic and provides redundancy in case of a failure in the working rings. The protection rings are used to reroute traffic in the event of a failure, ensuring continuous service.

Option Analysis:

Option A: Correct. BLSR uses 4 rings in total.
Option B: Incorrect. This is the number of rings used in UPSR, not BLSR.
Option C: Incorrect. BLSR does not use 6 rings.
Option D: Incorrect. BLSR does not use 8 rings.

374. A..... is an ARP that acts on behalf of a set of hosts.

Correct Answer: Correct answer is: (C) Proxy ARP.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: Proxy ARP is a technique where a device, typically a router, responds to ARP requests on behalf of another device or a set of devices.

Common Mistakes: Students may confuse Proxy ARP with ARP or RARP, which do not involve acting on behalf of other devices.

Explanations: Proxy ARP allows a device, usually a router, to respond to ARP requests intended for other devices within a network. This is useful in scenarios where devices are on different physical networks but need to communicate as if they are on the same network. The router acts as a proxy, responding to ARP requests for the devices it represents, thus enabling communication between them.

Option Analysis:

Option A: ARP is used to map IP addresses to MAC addresses on the same network, not to act on behalf of other devices.
Option B: RARP is used to map MAC addresses to IP addresses, not to act on behalf of other devices.
Option C: Proxy ARP is the correct answer as it involves a device acting on behalf of a set of hosts.
Option D: This option is incorrect as Proxy ARP is the correct answer.

375. A protocol used by the World Wide Web that defines how messages are formatted and transmitted, and what actions web servers and browsers should take in response to various commands

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

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

Difficulty: Easy

Concept notes: HTTP stands for Hypertext Transfer Protocol, which is used by the World Wide Web to define how messages are formatted and transmitted, and what actions web servers and browsers should take in response to various commands.

Common Mistakes: Students may confuse HTTP with other protocols like FTP (File Transfer Protocol) or HTML (Hypertext Markup Language), which are related but serve different purposes.

Explanations: HTTP is the protocol used by the World Wide Web to define how messages are formatted and transmitted, and what actions web servers and browsers should take in response to various commands. This makes it the correct answer as it directly addresses the question's requirements.

Option Analysis:

Option A: HTTP is the correct protocol used by the World Wide Web for message formatting and transmission.
Option B: FTP is a protocol used for transferring files over a network, not for defining message formats and actions in web communication.
Option C: HTML is a markup language used for structuring and presenting content on the web, not a protocol for message transmission.
Option D: TTP is not a recognized protocol in the context of web communication.

376. How many OSI layers are converted in the X.25 standard?

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The X.25 standard is a protocol for packet-switched networks that maps to the lower three layers of the OSI model: Physical (Layer 1), Data Link (Layer 2), and Network (Layer 3).

Common Mistakes: Students often confuse the number of layers involved in X.25 with the total number of layers in the OSI model, which is seven.

Explanations: X.25 is a protocol that operates at the lower three layers of the OSI model. It defines the Physical layer (Layer 1) for the physical transmission of data, the Data Link layer (Layer 2) for error detection and correction, and the Network layer (Layer 3) for routing and addressing. Therefore, the correct answer is three layers.

Option Analysis:

Option A: Incorrect because X.25 involves more than just two layers of the OSI model.
Option B: Correct because X.25 maps to the Physical, Data Link, and Network layers of the OSI model.
Option C: Incorrect because X.25 does not cover all seven layers of the OSI model.
Option D: Incorrect because X.25 does not cover six layers of the OSI model.

Mnemonic: P-D-N: Physical, Data Link, Network

377. Used for educational sites (most commonly four year universities)

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

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Very Easy

Concept notes: The .edu domain is specifically reserved for educational institutions, particularly four-year universities and colleges.

Common Mistakes: Students may confuse .edu with .com, which is used for commercial entities, or .org, which is often used for non-profit organizations.

Explanations: The .edu domain is designated for educational institutions, making it the appropriate choice for four-year universities and colleges. This domain is regulated to ensure it is used only by accredited educational organizations.

Option Analysis:

Option A: Correct. The .edu domain is used for educational institutions.
Option B: Incorrect. The .com domain is used for commercial entities.
Option C: Incorrect. The .org domain is used for non-profit organizations.
Option D: Incorrect. The .net domain is used for network providers and other internet-related services.

Mnemonic: Edu for Education, like University.

378. A user goes on a website and it begins to load immediately, and it completely loads quickly.

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

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: Bandwidth refers to the amount of data that can be transmitted over a network in a given time. High bandwidth means more data can be transmitted quickly, leading to faster website loading times.

Common Mistakes: Students may confuse bandwidth with latency, thinking that low bandwidth would also result in fast loading times.

Explanations: High bandwidth allows for a larger amount of data to be transferred quickly, which results in faster website loading times. Therefore, when a website loads quickly, it indicates high bandwidth.

Option Analysis:

Option A: Correct. High bandwidth allows for faster data transfer, leading to quick website loading.
Option B: Incorrect. Low bandwidth would result in slower data transfer and slower website loading.
Option C: Incorrect. The scenario described is specific to high bandwidth, not low bandwidth.
Option D: Incorrect. The scenario described is specific to high bandwidth, not neither high nor low bandwidth.

379. What technology is used to transfer both electrical power and data to remote devices over twisted-pair cable in an Ethernet network?

Correct Answer: Correct answer is: (A) Power over Ethernet (PoE).

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

Difficulty: Easy

Concept notes: Power over Ethernet (PoE) is a technology that allows electrical power to be transmitted over twisted-pair Ethernet cables, along with data, to power devices such as IP phones, wireless access points, and surveillance cameras.

Common Mistakes: Students may confuse Power over Ethernet (PoE) with other network technologies like Quality of Service (QoS), which is used to manage network traffic, or Voice over IP (VoIP), which is a method for placing phone calls over an IP network.

Explanations: Power over Ethernet (PoE) is the correct answer because it is specifically designed to deliver both electrical power and data over twisted-pair Ethernet cables. This technology is widely used in networked devices that require both power and data connectivity, such as IP phones, wireless access points, and security cameras. The other options do not provide the capability to transfer both power and data over Ethernet cables.

Option Analysis:

Option A: Power over Ethernet (PoE) is the correct answer as it is the technology that transfers both electrical power and data over twisted-pair cable in an Ethernet network.
Option B: Quality of Service (QoS) is a set of technologies used to manage network traffic and prioritize certain types of data, but it does not provide power.
Option C: Voice over IP (VoIP) is a method for placing phone calls over an IP network, but it does not provide power to devices.
Option D: Virtual private network (VPN) is a technology that creates a secure connection over a less secure network, but it does not provide power to devices.

380. Which is the example of largest computer network?

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

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: The Internet is the largest computer network, connecting millions of devices worldwide.

Common Mistakes: Students may confuse the Internet with other large networks like social networks or television networks, which are not computer networks in the same sense.

Explanations: The Internet is a global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide. It is the largest and most widely used computer network, connecting billions of devices and enabling global communication and information sharing. Other options like television networks and social networks do not qualify as the largest computer network.

Option Analysis:

Option A: Television networks are not computer networks and do not connect devices in the same way the Internet does.
Option B: The Internet is the largest computer network, connecting billions of devices worldwide.
Option C: Social networks are platforms for social interaction and do not qualify as the largest computer network.
Option D: This option is incorrect as the Internet is indeed the largest computer network.

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Computer networking MCQ - Set 38

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