Computer networking MCQ – Change your future

691. Modulation is used to:

Correct Answer: Correct answer is: (C) Ensure that information may be transmitted over long distances.

Exam Relevance: EE, ECE, Telecommunications Engineering

Difficulty: Moderate

Concept notes: Modulation is a process that allows information to be transmitted over long distances by altering a carrier wave.

Common Mistakes: Students may confuse modulation with other signal processing techniques, such as filtering or amplification.

Explanations: Modulation is essential for transmitting information over long distances because it allows the information to be encoded onto a carrier wave that can travel efficiently through various media, such as air or cables. Without modulation, the information would be too weak to travel long distances and would be susceptible to interference and attenuation. By modulating the information onto a carrier wave, the signal can be amplified and transmitted over long distances with minimal loss of information.

Option Analysis:

Option A: Modulation does not reduce the bandwidth; it can actually increase it depending on the modulation scheme used.
Option B: While modulation can help separate different transmissions, this is not its primary purpose.
Option C: Modulation ensures that information can be transmitted over long distances by encoding it onto a carrier wave.
Option D: Modulation does not directly allow the use of practicable antennas; it is the carrier wave that determines the antenna requirements.

692. In modulo-2 arithmetic, we use the..... operation for both addition and subtraction.

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

Exam Relevance: Computer Science Exams, Digital Logic Exams, Cryptography Exams

Difficulty: Easy

Concept notes: In modulo-2 arithmetic, the XOR operation is used for both addition and subtraction.

Common Mistakes: Students may confuse XOR with other logical operations like AND or OR, which do not have the same properties in modulo-2 arithmetic.

Explanations: In modulo-2 arithmetic, the XOR operation is equivalent to addition and subtraction because it performs the operation without carrying over. The XOR operation returns 1 if the bits are different and 0 if they are the same, which aligns with the properties of addition and subtraction in modulo-2 arithmetic.

Option Analysis:

Option A: Correct. XOR is used for both addition and subtraction in modulo-2 arithmetic.
Option B: Incorrect. OR operation does not perform the same function as addition or subtraction in modulo-2 arithmetic.
Option C: Incorrect. AND operation does not perform the same function as addition or subtraction in modulo-2 arithmetic.
Option D: Incorrect. XOR is the correct operation for both addition and subtraction in modulo-2 arithmetic.

Mnemonic: XOR for both, not OR or AND.

693. Cannot use Internet and phone line at the same time.

Correct Answer: Correct answer is: (A) Dial-up.

Exam Relevance: General Computer Science Exams, Networking Exams

Difficulty: Easy

Concept notes: Dial-up internet requires the use of a telephone line to connect to the internet, which means the line is occupied during the connection.

Common Mistakes: Students may confuse dial-up with other internet connection types that do not require exclusive use of the phone line.

Explanations: Dial-up internet uses the same telephone line for both internet and phone calls. When a dial-up connection is active, the phone line is in use, preventing simultaneous phone calls. Other connection types like DSL, fiber-optic, and satellite do not have this limitation.

Option Analysis:

Option A: Dial-up uses the phone line exclusively for internet, preventing simultaneous phone calls.
Option B: DSL allows simultaneous use of the phone line for both internet and phone calls.
Option C: Fiber-optic does not use the phone line, so it can be used simultaneously with phone calls.
Option D: Satellite internet does not use the phone line, so it can be used simultaneously with phone calls.

Mnemonic: Dial-up, Dial-up, Dial-up: Phone line busy, no calls.

694. PURE ALOHA

Correct Answer: Correct answer is: (A) Does not require global time synchronization.

Exam Relevance: Computer Networks, Data Communications, Network Protocols

Difficulty: Easy

Concept notes: Pure ALOHA is a simple random access protocol for wireless networks that does not require all nodes to be synchronized to a global clock.

Common Mistakes: Students may mistakenly believe that Pure ALOHA requires global time synchronization because they confuse it with other protocols that do require synchronization.

Explanations: Pure ALOHA operates by allowing nodes to transmit data frames at any time without coordination with other nodes. If a collision occurs, nodes will retransmit after a random delay. This process does not require all nodes to be synchronized to a global clock, making it a decentralized protocol.

Option Analysis:

Option A: Correct. Pure ALOHA does not require global time synchronization.
Option B: Incorrect. Pure ALOHA does not require global time synchronization.
Option C: Incorrect. Both options cannot be correct simultaneously.
Option D: Incorrect. The correct answer is provided.

695. In the OSI model, physical addressing takes place at the:

Correct Answer: Correct answer is: (A) Data link layer.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: Physical addressing in the OSI model is handled by the data link layer, which is responsible for the physical addressing of devices on a network.

Common Mistakes: Students often confuse the data link layer with the physical layer, which deals with the physical transmission of data.

Explanations: The data link layer is responsible for physical addressing through the use of MAC addresses. These addresses uniquely identify devices on a local network. The physical layer, on the other hand, deals with the physical transmission of data, such as voltage levels and physical connections. Layer 4 is the transport layer, which handles end-to-end communication. The session layer (Layer 5) manages sessions between applications.

Option Analysis:

Option A: Correct. The data link layer is responsible for physical addressing using MAC addresses.
Option B: Incorrect. Layer 4 is the transport layer, which is not responsible for physical addressing.
Option C: Incorrect. The physical layer deals with the physical transmission of data, not addressing.
Option D: Incorrect. The session layer manages sessions between applications, not physical addressing.

Mnemonic: Data Link Layer: "D" for "Directly connected devices"

696. IANA has divided port numbers into

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: IANA (Internet Assigned Numbers Authority) divides port numbers into three distinct ranges: well-known ports, registered ports, and dynamic or private ports.

Common Mistakes: Students may confuse the number of ranges with the number of port types or the structure of the ranges themselves.

Explanations: IANA divides port numbers into three ranges: well-known ports (0-1023), registered ports (1024-49151), and dynamic or private ports (49152-65535). This division helps in managing and assigning ports for various services and applications.

Option Analysis:

Option A: Incorrect because IANA does not divide port numbers into pair ranges.
Option B: Correct because IANA divides port numbers into three ranges: well-known, registered, and dynamic or private.
Option C: Incorrect because IANA does not divide port numbers into a pair of four ranges.
Option D: Incorrect because it combines an incorrect option (A) with an incorrect option (C).

Mnemonic: W-R-D: Well-known, Registered, Dynamic

697. Which agency developed standards for physical connection interfaces and electronic signaling specifications?

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

Exam Relevance: IEEE, CompTIA, EIA

Difficulty: Moderate

Concept notes: The Electronic Industries Alliance (EIA) developed standards for physical connection interfaces and electronic signaling specifications.

Common Mistakes: Students may confuse the EIA with other standards organizations like ITU-T, ANSI, or ISO, which also develop standards but in different areas.

Explanations: The EIA, now known as the Association for Advancing Automation (A3), is responsible for developing standards for physical connection interfaces and electronic signaling specifications. These standards ensure compatibility and interoperability between different electronic devices and systems. The EIA has historically focused on telecommunications and electronics, making it the correct choice for this question.

Option Analysis:

Option A: Correct. The EIA developed standards for physical connection interfaces and electronic signaling specifications.
Option B: Incorrect. The ITU-T focuses on telecommunications standards but not specifically on physical connection interfaces and electronic signaling specifications.
Option C: Incorrect. ANSI develops standards for a wide range of industries but not specifically for physical connection interfaces and electronic signaling specifications.
Option D: Incorrect. ISO develops international standards across various fields but not specifically for physical connection interfaces and electronic signaling specifications.

Mnemonic: EIA: Electronics Interface Alliance

698. The combination of an IP address and port number is called as?

Correct Answer: Correct answer is: (A) Socket address.

Exam Relevance: Networking exams, Computer Science exams, CCNA, CISSP

Difficulty: Easy

Concept notes: A socket address is a combination of an IP address and a port number, used to uniquely identify a communication endpoint in a network.

Common Mistakes: Students may confuse a socket address with a port address, which only refers to the port number and not the IP address.

Explanations: A socket address is defined as the combination of an IP address and a port number. This combination uniquely identifies a communication endpoint in a network, allowing data to be sent to and from specific applications running on specific devices. The IP address specifies the device, while the port number specifies the application or service on that device.

Option Analysis:

Option A: Correct. A socket address is the combination of an IP address and a port number.
Option B: Incorrect. A port address only refers to the port number, not the IP address.
Option C: Incorrect. A MAC address is a hardware address used to uniquely identify a network interface, not a combination of IP address and port number.
Option D: Incorrect. A host address typically refers to the IP address of a host, not the combination of IP address and port number.

Mnemonic: Socket = IP + Port

699. The speed of a network connection is measured

Correct Answer: Correct answer is: (B) How many bits can be transferred in one second.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: The speed of a network connection is typically measured in bits per second (bps).

Common Mistakes: Students may confuse bits with bytes, as both are units of data.

Explanations: The speed of a network connection is measured by the number of bits that can be transferred in one second. This is because bits are the fundamental unit of data in digital communication, and the rate at which these bits are transmitted determines the speed of the connection.

Option Analysis:

Option A: Bytes are a larger unit of data, consisting of 8 bits. While bytes are commonly used to measure file sizes, network speed is measured in bits per second.
Option B: Bits per second (bps) is the standard unit for measuring network speed, as it directly reflects the rate of data transfer.
Option C: Nibbles are not a standard unit for measuring network speed. A nibble consists of 4 bits, but network speed is measured in bits per second.
Option D: The number of files transferred per second is not a standard measure of network speed, as file sizes can vary greatly. Network speed is measured in bits per second.

Mnemonic: Bits per second, not bytes, bits, or files.

700. What does the java.net.InetAddress class represent?

Correct Answer: Correct answer is: (B) IP Address.

Exam Relevance: Java Certification, Computer Science Exams, Networking Exams

Difficulty: Easy

Concept notes: The java.net.InetAddress class in Java represents an IP address.

Common Mistakes: Students may confuse the InetAddress class with other networking classes like Socket or Protocol, which are related but distinct.

Explanations: The InetAddress class in Java is used to represent an IP address. It provides methods to create and manipulate IP addresses, and it can be used to obtain the IP address of a host by name or to get the host name for a given IP address. This class does not represent a socket, protocol, or MAC address, which are different components of network communication.

Option Analysis:

Option A: Socket is a different class in Java that represents a connection between two endpoints for data transfer, not an IP address.
Option B: IP Address is the correct representation of what the InetAddress class is used for in Java.
Option C: Protocol refers to a set of rules for data communication, not an IP address.
Option D: MAC Address is a hardware address used in network interfaces, not an IP address.

Mnemonic: InetAddress = IP Address

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Computer networking MCQ - Set 70

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