Computer networking MCQ – Change your future

381. Which domain category respresents Germany?

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

Exam Relevance: IC3, CompTIA A+, CCNA

Difficulty: Very Easy

Concept notes: The domain category .de represents Germany.

Common Mistakes: Students may confuse .de with other country codes, such as .ch for Switzerland or .uk for the United Kingdom.

Explanations: The domain category .de is the country code top-level domain (ccTLD) for Germany. It is used for websites and email addresses associated with Germany.

Option Analysis:

Option A: .de is the correct country code for Germany.
Option B: .ch is the country code for Switzerland.
Option C: .uk is the country code for the United Kingdom.
Option D: .ge is the country code for Georgia.

382. Value of frame body field of Media Access Control frame is in between

Correct Answer: Correct answer is: (C) 0 to 2312 bytes.

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Moderate

Concept notes: The frame body field in a Media Access Control (MAC) frame can vary in size, but it is constrained by the maximum transmission unit (MTU) of the network. For Ethernet, the MTU is typically 1500 bytes, but the total frame size, including the header and trailer, can be up to 1518 bytes. However, the frame body itself can be larger in some cases, up to 2312 bytes, which includes the data payload and any padding.

Common Mistakes: Students often confuse the maximum frame size with the maximum frame body size, leading to incorrect assumptions about the range of the frame body field.

Explanations: The frame body field in a MAC frame can range from 0 bytes (when there is no data payload) to a maximum of 2312 bytes. This maximum is determined by the Ethernet standard, which allows for a total frame size of up to 2312 bytes, including the header and trailer. The other options (0 to 512 bytes, 0 to 1214 bytes, and 0 to 3450 bytes) do not align with the Ethernet standard for the maximum frame body size.

Option Analysis:

Option A: This range is too small and does not account for the typical data payload sizes in Ethernet frames.
Option B: This range is also too small and does not cover the maximum possible frame body size in Ethernet.
Option C: This range correctly reflects the maximum frame body size allowed by the Ethernet standard.
Option D: This range exceeds the maximum frame body size allowed by the Ethernet standard.

383. A network in a home is what type of network?

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

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

Difficulty: Easy

Concept notes: A network in a home is typically a Local Area Network (LAN), which connects devices within a limited area such as a residence.

Common Mistakes: Students may confuse LAN with WAN, thinking that a home network could be a Wide Area Network due to the internet connection.

Explanations: A Local Area Network (LAN) is a computer network that interconnects computers within a limited area such as a residence, school, or office building. Home networks are designed to connect devices like computers, smartphones, and printers within a single household, fitting the definition of a LAN.

Option Analysis:

Option A: Correct. LAN stands for Local Area Network, which is the type of network used in homes.
Option B: Incorrect. BAN stands for Body Area Network, which is used for devices worn on the body.
Option C: Incorrect. WAN stands for Wide Area Network, which covers a broad area such as cities or countries.
Option D: Incorrect. VAN stands for Virtual Area Network, which is not a standard network type and is not typically used in home settings.

Mnemonic: LAN: Local Area Network, think "Local Living Area Network" for home use.

384. High data rate capability of fiber optic cable can be achieved by

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

Exam Relevance: GATE, ECE, EE, Optical Networking Exams

Difficulty: Moderate

Concept notes: WDM (Wavelength Division Multiplexing) allows multiple data streams to be transmitted simultaneously over a single fiber by using different wavelengths of light. This significantly increases the data rate capability of fiber optic cables.

Common Mistakes: Students may confuse WDM with other multiplexing techniques like TDM (Time Division Multiplexing) or FDM (Frequency Division Multiplexing), which do not directly apply to fiber optic data transmission.

Explanations: WDM increases the data rate capability of fiber optic cables by transmitting multiple data streams simultaneously using different wavelengths of light. Each wavelength can carry a separate data stream, effectively multiplying the capacity of the fiber. This technique is widely used in high-speed optical networks to achieve very high data rates.

Option Analysis:

Option A: COMA is not a recognized acronym in the context of fiber optic data transmission.
Option B: WDM (Wavelength Division Multiplexing) is the correct answer as it allows multiple data streams to be transmitted simultaneously over a single fiber using different wavelengths of light.
Option C: TDM (Time Division Multiplexing) is a technique used in digital communications but does not directly apply to increasing the data rate in fiber optic cables.
Option D: FDM (Frequency Division Multiplexing) is used in analog communications and is not applicable to fiber optic data transmission.

Mnemonic: WDM: Wavelengths Divide Multiplexing

385. For stop-and-wait flow control, for n data packets sent, how many acknowledgments are needed?

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

Exam Relevance: Computer Networks, Data Communication, Network Protocols

Difficulty: Easy

Concept notes: In stop-and-wait flow control, each data packet sent requires an acknowledgment from the receiver before the next packet can be sent.

Common Mistakes: Students may mistakenly think that additional acknowledgments are needed for the protocol to function, leading to incorrect options like N+1 or 2N.

Explanations: For each data packet sent, one acknowledgment is required. Therefore, for n data packets, n acknowledgments are needed. This is because the sender waits for an acknowledgment before sending the next packet, ensuring that each packet is individually confirmed.

Option Analysis:

Option A: Correct. Each data packet requires one acknowledgment.
Option B: Incorrect. N-1 would imply one less acknowledgment than the number of packets, which is not the case.
Option C: Incorrect. 2N would imply twice the number of acknowledgments, which is not necessary.
Option D: Incorrect. N+1 would imply one extra acknowledgment, which is not required.

386. During datagram switching, the packets are placed in..... to wait until the given transmission line becomes available.

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

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Easy

Concept notes: In datagram switching, packets are placed in a queue to wait for transmission.

Common Mistakes: Students may confuse the queue with a stack, thinking that packets are processed in a last-in-first-out manner.

Explanations: Datagram switching involves breaking data into packets, each of which is routed independently. These packets are placed in a queue to wait for the transmission line to become available. Queues operate on a first-in-first-out (FIFO) principle, ensuring that packets are transmitted in the order they arrive.

Option Analysis:

Option A: A stack is a data structure that operates on a last-in-first-out (LIFO) principle, which is not suitable for packet transmission in datagram switching.
Option B: A queue is the correct data structure used in datagram switching to manage packets waiting for transmission.
Option C: A hash is a data structure used for fast lookups, not for managing the order of packet transmission.
Option D: A routing table is used to determine the path for packet transmission, not to queue packets.

Mnemonic: Queue = Quickly Undergoes Uninterrupted Enqueueing

387. What is a Network adapter used for and how many bits does it have hard-coded?

Correct Answer: Correct answer is: (B) Is a 48-bit number hard-coded on the card and network adapter is used for physical connection/network.

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

Difficulty: Moderate

Concept notes: A network adapter, also known as a network interface card (NIC), is a hardware component that allows a computer to connect to a network. It has a unique physical address, known as the MAC (Media Access Control) address, which is a 48-bit number hard-coded on the card.

Common Mistakes: Students often confuse the MAC address with the IP address, which is a logical address used at the network layer, not the physical layer.

Explanations: A network adapter is used for physical connection to a network, and it has a 48-bit MAC address hard-coded on the card. This address is unique to each network interface and is used for communication at the data link layer of the OSI model.

Option Analysis:

Option A: Incorrect because the network adapter is not specifically for wireless connections and the MAC address is 48-bit, not 32-bit.
Option B: Correct because it accurately describes the 48-bit MAC address and the function of the network adapter.
Option C: Incorrect because it does not mention the physical connection aspect of the network adapter.
Option D: Incorrect because a network adapter is not a modem, and the MAC address is 48-bit, not 32-bit.

Mnemonic: MAC 48, Network Connect

388. Small device that connects computers together

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

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

Difficulty: Easy

Concept notes: A hub is a small device that connects multiple computers together in a network.

Common Mistakes: Students may confuse a hub with a router or switch, which also connect devices but have different functionalities.

Explanations: A hub is a simple networking device that connects multiple computers or devices together in a network. It forwards data to all connected devices, making it a basic form of network connectivity. This makes it the correct answer for a small device that connects computers together.

Option Analysis:

Option A: Wifi is a wireless technology for connecting devices, not a physical device that connects computers.
Option B: A server is a computer system that provides services to other computers, but it is not a small device specifically designed to connect multiple computers together.
Option C: A queue is a data structure for managing data, not a device that connects computers.
Option D: A hub is a small device that connects multiple computers together in a network, making it the correct answer.

Mnemonic: Hub = Hub connects, not much hubbub.

389. In IPv6, another example of Congestion-Controlled Traffic is

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: TCP (Transmission Control Protocol) is a congestion-controlled transport protocol in IPv6, ensuring data is transmitted reliably and efficiently by managing network congestion.

Common Mistakes: Students may confuse TCP with UDP, which is a connectionless protocol and not congestion-controlled.

Explanations: TCP is designed to manage congestion in the network by adjusting the rate of data transmission based on network conditions. This makes it a prime example of congestion-controlled traffic in IPv6. ICMP (Internet Control Message Protocol) and IPv4 are not transport protocols and do not manage congestion control. UDP (User Datagram Protocol) is a connectionless protocol and does not perform congestion control.

Option Analysis:

Option A: TCP is a congestion-controlled protocol, making it the correct answer.
Option B: ICMP is used for error reporting and diagnostics, not for congestion control.
Option C: IPv4 is an older version of the Internet Protocol and not a transport protocol.
Option D: UDP is a connectionless protocol and does not perform congestion control.

Mnemonic: TCP: Transmission Control Protocol, Think Congestion Prevention

390. PAN is .....

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

Exam Relevance: Networking exams, Computer Science exams, IT certifications

Difficulty: Easy

Concept notes: PAN stands for Personal Area Network, which is a type of computer network used for data transmission among devices such as computers, telephones, and tablets within a limited range.

Common Mistakes: Students may confuse PAN with other types of networks like LAN (Local Area Network) or WAN (Wide Area Network).

Explanations: PAN is a network for interconnecting devices within a small area, typically within a person's reach. It is used for short-range communication between devices such as smartphones, laptops, and wearable technology. The term "Personal Area Network" accurately describes its function and scope.

Option Analysis:

Option A: Incorrect. People Area Network is not a recognized term in networking.
Option B: Correct. Personal Area Network is the correct term for PAN.
Option C: Incorrect. Public Area Network is not a recognized term in networking.
Option D: Incorrect. Pressure Area Network is not a recognized term in networking.

Mnemonic: PAN: Personal Area Network

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Computer networking MCQ - Set 39

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