Computer networking MCQ

1251. MAC addressing works in data link layer while IP addressing works in.....

Correct Answer: Correct answer is: (D) Network layer.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: IP addressing operates at the Network layer of the OSI model, which is responsible for logical addressing and routing of data packets across networks.

Common Mistakes: Students often confuse the layers of the OSI model, particularly the Data Link layer (where MAC addressing occurs) and the Network layer (where IP addressing occurs).

Explanations: IP addressing is used to uniquely identify devices on a network and is handled at the Network layer. This layer is responsible for logical addressing and routing, ensuring that data packets are sent to the correct destination based on IP addresses. The Data Link layer, on the other hand, uses MAC addresses for communication within a local network segment.

Option Analysis:

Option A: The Physical layer deals with the transmission and reception of raw bit streams over a physical medium, not with addressing.
Option B: The Transport layer is responsible for end-to-end communication and does not handle IP addressing.
Option C: The Application layer is the highest layer and deals with user applications, not with IP addressing.
Option D: The Network layer is responsible for logical addressing and routing, which includes IP addressing.

Mnemonic: IP for Network, MAC for Link

1252. Logical Link Control and Adaptation Protocol (L2CAP) divides large packets into

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

Exam Relevance: Computer Networks, Wireless Communication, Bluetooth Protocol

Difficulty: Moderate

Concept notes: L2CAP is a protocol used in Bluetooth and other wireless technologies to manage data transmission between devices. It is responsible for dividing large packets into smaller units to ensure efficient and reliable communication.

Common Mistakes: Students may confuse the terms "frames" and "segments," as both are used in data communication. However, frames are typically used in the data link layer, while segments are used in the transport layer or in protocols like L2CAP.

Explanations: L2CAP divides large packets into smaller units called segments. This process is necessary to ensure that data can be transmitted efficiently and reliably over a wireless link. Segmentation allows for better error handling and retransmission of lost or corrupted data segments.

Option Analysis:

Option A: Frames are used in the data link layer for encapsulating data, not in L2CAP for dividing large packets.
Option B: Data is the general term for the information being transmitted, but L2CAP specifically divides data into segments.
Option C: Segments are the correct term for the smaller units into which L2CAP divides large packets.
Option D: Signals are used for communication between devices but are not the term for dividing large packets in L2CAP.

Mnemonic: L2CAP Splits: Segments

1253. The modern telephone network is now.....

Correct Answer: Correct answer is: (C) Digital as well as analog.

Exam Relevance: Telecommunications Engineering, Network Engineering, Information Technology

Difficulty: Moderate

Concept notes: The modern telephone network incorporates both digital and analog technologies.

Common Mistakes: Students may mistakenly believe that the modern telephone network is entirely digital, overlooking the continued use of analog components.

Explanations: The modern telephone network is a hybrid system that uses both digital and analog technologies. Digital technology is used for long-distance transmission and switching, providing higher quality and more efficient communication. However, analog technology is still used in local loops and some legacy systems. Therefore, the network is a combination of both digital and analog components.

Option Analysis:

Option A: Incorrect, as the network is not entirely digital.
Option B: Incorrect, as the network is not entirely analog.
Option C: Correct, as the network uses both digital and analog technologies.
Option D: Incorrect, as the network does use both digital and analog technologies.

1254. Consider the following Statements: Bandwidth on a wireless connection is lower than a wired connection. The binary digits 0 and 1 are each called a bit. In a star network, one disadvantage is that it is expensive to install because more hardware (e.g. switches) are needed Which of the following statement(s) is/are true?

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

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Moderate

Concept notes: The statements provided are related to network characteristics and terminology. Each statement is evaluated for its accuracy.

Common Mistakes: Students may incorrectly assume that all wireless connections have the same bandwidth as wired connections, or they may not be familiar with the term "bit" or the structure of a star network.

Explanations: Statement 1 is true because wireless connections generally have lower bandwidth compared to wired connections due to interference and signal degradation. Statement 2 is true as the binary digits 0 and 1 are indeed each called a bit. Statement 3 is true because a star network requires a central hub or switch, which can increase installation costs.

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.

1255. This term describes the amount of data that can be moved from one point on a network to another point in a given time.

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

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: Bandwidth refers to the maximum amount of data that can be transmitted over a network in a given time period.

Common Mistakes: Students may confuse bandwidth with speed, which measures how fast data travels, not the amount of data.

Explanations: Bandwidth is the term that describes the amount of data that can be moved from one point on a network to another point in a given time. It is a measure of the capacity of a network connection, indicating the maximum data transfer rate. Speed, on the other hand, refers to the rate at which data travels, not the amount of data that can be transmitted.

Option Analysis:

Option A: Correct. Bandwidth is the correct term for the amount of data that can be moved over a network in a given time.
Option B: Incorrect. Speed refers to the rate of data transfer, not the amount of data.
Option C: Incorrect. Flow is not a standard term used to describe data transmission capacity.
Option D: Incorrect. Bits per second is a unit of measurement for data transfer rate, not the term for the capacity itself.

1256. In telecommunications, transmission media can be divided into

Correct Answer: Correct answer is: (C) Two broad categories.

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

Difficulty: Easy

Concept notes: Transmission media in telecommunications can be broadly categorized into two main types: guided and unguided media.

Common Mistakes: Students may confuse the number of categories or mix up the types of media within each category.

Explanations: Transmission media in telecommunications are divided into two broad categories: guided and unguided. Guided media, such as twisted pair, coaxial cable, and optical fiber, require a physical path for the signal to travel. Unguided media, such as radio waves, microwaves, and infrared, do not require a physical path and propagate through air or space.

Option Analysis:

Option A: Incorrect, as there are not four broad categories of transmission media.
Option B: Incorrect, as there are not three broad categories of transmission media.
Option C: Correct, as transmission media are divided into two broad categories: guided and unguided.
Option D: Incorrect, as there are indeed two broad categories of transmission media.

Mnemonic: G.U. - Guided and Unguided

1257. Which of the following devices is used to amplify a signal in a network?

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

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Easy

Concept notes: A repeater is a device used to amplify and regenerate a signal in a network to extend the distance over which the signal can be transmitted.

Common Mistakes: Students may confuse a repeater with a hub, which is a device that broadcasts incoming data to all connected devices, rather than amplifying the signal.

Explanations: A repeater is specifically designed to amplify and regenerate a signal in a network. It receives a weak signal, amplifies it, and retransmits it, allowing the signal to travel further without degradation. This is crucial for maintaining signal strength over long distances in a network.

Option Analysis:

Option A: A MODEM (Modulator-Demodulator) is used to convert digital signals to analog signals and vice versa, not to amplify signals.
Option B: A Repeater is used to amplify and regenerate a signal in a network.
Option C: A Hub is a device that broadcasts incoming data to all connected devices, not to amplify signals.
Option D: An RJ 45 Connector is a type of connector used to connect Ethernet cables, not to amplify signals.

Mnemonic: R for Repeater, R for Regenerate.

1258. When Amplitude Shift Keying (ASK) is implemented using only two levels then it is called

Correct Answer: Correct answer is: (C) Binary ASK.

Exam Relevance: GATE, ECE, EE

Difficulty: Easy

Concept notes: Amplitude Shift Keying (ASK) is a form of modulation where the amplitude of the carrier wave is varied to represent digital data. When ASK uses only two levels, it is referred to as Binary ASK.

Common Mistakes: Students may confuse Binary ASK with other forms of ASK that use more than two levels, such as Multilevel ASK.

Explanations: Binary ASK is a modulation technique where the amplitude of the carrier wave is changed between two levels to represent binary data (0 and 1). This is the simplest form of ASK and is correctly labeled as Binary ASK.

Option Analysis:

Option A: Half Duplex ASK is not a standard term in digital communication. Half Duplex refers to a communication system that allows data to be transmitted in both directions but not simultaneously.
Option B: Multilevel ASK refers to ASK that uses more than two levels, which is not the case for Binary ASK.
Option C: Binary ASK is the correct term for ASK that uses only two levels to represent binary data.
Option D: Duplex ASK is not a standard term in digital communication. Duplex refers to a communication system that allows data to be transmitted in both directions simultaneously.

1259. Which of the following technique is used for allocating capacity on a satellite channel using fixed-assignment FDM?

Correct Answer: Correct answer is: (B) Frequency-division multiple access.

Exam Relevance: ECE, GATE, IEEE

Difficulty: Moderate

Concept notes: Frequency-division multiple access (FDMA) is a technique used in satellite communications to allocate capacity on a satellite channel using fixed-assignment frequency-division multiplexing (FDM).

Common Mistakes: Students may confuse FDMA with other modulation techniques like frequency modulation (FM) or frequency-shift keying (FSK), which are not methods of allocating channel capacity.

Explanations: Frequency-division multiple access (FDMA) is specifically designed to allocate different frequency bands to different users in a communication system. In the context of satellite communications, FDMA allows multiple users to share the same satellite channel by assigning each user a specific frequency band. This method ensures that each user's signal is transmitted and received without interference from other users, making it an effective technique for allocating capacity on a satellite channel using fixed-assignment FDM.

Option Analysis:

Option A: Amplitude modulation is a method of transmitting information by varying the amplitude of a carrier wave, not a method for allocating channel capacity.
Option B: Frequency-division multiple access is the correct technique for allocating capacity on a satellite channel using fixed-assignment FDM.
Option C: Frequency modulation is a method of transmitting information by varying the frequency of a carrier wave, not a method for allocating channel capacity.
Option D: Frequency-shift keying is a type of frequency modulation used for digital data transmission, not a method for allocating channel capacity.

1260. An international standard, multilevel set of protocols to promote compatibility among telecommunications networks. Select the best fit for answer:

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The OSI (Open Systems Interconnection) model is a conceptual framework used to describe the functions of a telecommunication or computing system. It is a multilevel set of protocols designed to promote compatibility among different telecommunications networks.

Common Mistakes: Students may confuse OSI with other network-related terms such as TCP/IP, which is a specific protocol suite rather than a conceptual model.

Explanations: The OSI model is an international standard that defines a framework for the coordination of telecommunications. It is a conceptual model that divides network communication into seven layers, each with specific functions. This multilevel set of protocols ensures compatibility and interoperability among different networks, making it the correct answer.

Option Analysis:

Option A: A network server is a computer system that provides services to other computers on a network, not a set of protocols.
Option B: A Virtual Private Network (VPN) is a technology for creating a secure connection over a less secure network, not a set of protocols.
Option C: A network operating system is an operating system designed to support workstation computers in a local area network, not a set of protocols.
Option D: The OSI model is a multilevel set of protocols designed to promote compatibility among telecommunications networks, making it the correct answer.

Mnemonic: OSI: Open Systems Interconnection

⬅ Previous SetSet 126Next Set ➡

Computer networking MCQ - Set 126

Leave a Reply