Computer networking MCQ – Change your future

631. Which layer in the OSI model do MAC addresses and switches use?

Correct Answer: Correct answer is: (B) Data Link.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: MAC addresses and switches operate at the Data Link layer of the OSI model.

Common Mistakes: Students may confuse the Data Link layer with the Physical layer, as both deal with hardware addresses and network devices.

Explanations: The Data Link layer is responsible for the reliable transfer of data between nodes on the same network segment. MAC addresses are used to uniquely identify devices on a local network, and switches use these addresses to forward data frames to the correct destination. This layer handles the physical addressing and switching of data packets within a network.

Option Analysis:

Option A: The Physical layer deals with the physical transmission of data, not with MAC addresses or switching.
Option B: The Data Link layer is where MAC addresses and switches operate.
Option C: The Network layer deals with logical addressing and routing between different networks, not with MAC addresses or switching.
Option D: The Transport layer is responsible for end-to-end communication and does not handle MAC addresses or switching.

Mnemonic: MAC stands for Media Access Control, which is a key function of the Data Link layer.

632. ANALOG TO DIGITAL CONVERSION IS KNOWN AS .....

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

Exam Relevance: EE, ECE, Digital Signal Processing

Difficulty: Easy

Concept notes: Modulation is the process of converting an analog signal into a digital signal.

Common Mistakes: Students often confuse modulation with demodulation, which is the reverse process of converting a digital signal back into an analog signal.

Explanations: Modulation is the process of converting an analog signal into a digital signal. This is the correct term for analog to digital conversion. Demodulation, on the other hand, is the process of converting a digital signal back into an analog signal. Therefore, the correct answer is modulation.

Option Analysis:

Option A: Correct. Modulation is the process of converting an analog signal into a digital signal.
Option B: Incorrect. Demodulation is the reverse process of converting a digital signal back into an analog signal.
Option C: Incorrect. The correct answer is not either of the options, but specifically modulation.
Option D: Incorrect. The correct answer is modulation, not neither of the options.

Mnemonic: A to D, M to D

633. What is an example of network media?

Correct Answer: Correct answer is: (A) Networking CAT5 cable.

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Easy

Concept notes: Network media refers to the physical components used to transmit data between devices in a network. Examples include cables, wireless signals, and other transmission mediums.

Common Mistakes: Students may confuse network media with network devices, such as switches or routers, which are not the physical means of data transmission.

Explanations: Networking CAT5 cable is a type of network media used to physically connect devices in a network, allowing data to be transmitted between them. It is a physical medium that enables the transfer of data, making it a correct example of network media.

Option Analysis:

Option A: Correct. CAT5 cable is a physical medium used for data transmission in networks.
Option B: Incorrect. A desktop computer is a device, not a network media.
Option C: Incorrect. A laptop is a device, not a network media.
Option D: Incorrect. A network switch is a device, not a network media.

634. The term that is used to define the end of the frame and the beginning of the next frame is called

Correct Answer: Correct answer is: (D) Variable size framing.

Exam Relevance: Computer Networks, Data Communication, Network Engineering

Difficulty: Moderate

Concept notes: Variable size framing is a method used in data communication to define the end of one frame and the beginning of the next. It allows frames to vary in size, which can be useful in different network environments.

Common Mistakes: Students often confuse variable size framing with fixed size framing, which uses a predetermined frame size.

Explanations: Variable size framing is the correct term because it defines the end of one frame and the beginning of the next, allowing for flexibility in frame size. This method is used to efficiently manage data transmission in networks where frame sizes may vary.

Option Analysis:

Option A: Byte stuffing is a technique used to ensure that certain byte sequences are not misinterpreted as frame boundaries, but it does not define the end of the frame itself.
Option B: Byte unstuffing is the reverse process of byte stuffing, used to remove stuffed bytes, but it does not define the end of the frame.
Option C: Fixed size framing uses a predetermined frame size, which does not allow for variability in frame size.
Option D: Variable size framing is the correct term as it allows for frames of different sizes and defines the end of one frame and the beginning of the next.

635. State whether true or false. i) A connection oriented protocol can only use unicast addresses. ii) The any cast service is included in IPV6.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: Connection-oriented protocols establish a dedicated path for communication, which typically uses unicast addresses. AnyCast is a feature of IPv6 that allows a single IP address to be associated with multiple network interfaces.

Common Mistakes: Students may confuse connection-oriented protocols with connectionless protocols, which can use multicast or broadcast addresses. They may also overlook the inclusion of anycast in IPv6.

Explanations: Connection-oriented protocols require a dedicated path for communication, which is established before data transmission begins. This path is typically set up using unicast addresses, which are unique to a single device. Therefore, a connection-oriented protocol can only use unicast addresses. The second part of the statement is true because IPv6 includes the anycast service, which allows a single IP address to be associated with multiple network interfaces, enabling load balancing and redundancy.

Option Analysis:

Option A: Correct, as both statements are true.
Option B: Incorrect, as the second statement is true.
Option C: Incorrect, as the first statement is true.
Option D: Incorrect, as both statements are true.

636. The program that accepts the commands for composing, receiving and replying to messages, as well as for manipulating mail boxes is.....

Correct Answer: Correct answer is: (A) User agent.

Exam Relevance: CISSP, CompTIA Security+, Network+

Difficulty: Easy

Concept notes: A user agent is a program that interacts with the user and provides functionalities for composing, receiving, and replying to messages, as well as for manipulating mailboxes.

Common Mistakes: Students may confuse the user agent with the message transfer agent, which is responsible for transferring messages between mail servers.

Explanations: The user agent is the software that directly interacts with the user to perform tasks such as composing, receiving, and replying to messages, as well as managing mailboxes. It is the interface through which users interact with their email system. The other options, such as browser agent, message transfer agent, and server agent, do not directly provide these user-facing functionalities.

Option Analysis:

Option A: Correct. The user agent is the program that interacts with the user for email tasks.
Option B: Incorrect. A browser agent is related to web browsing, not email management.
Option C: Incorrect. A message transfer agent is responsible for transferring messages between servers, not for user interaction.
Option D: Incorrect. A server agent typically refers to server-side software, not user-facing software.

637. In IPv6, format and length of IP address were changed along with the

Correct Answer: Correct answer is: (D) Packet Format.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: IPv6 introduced changes not only in the format and length of IP addresses but also in the packet format to accommodate new features and improvements.

Common Mistakes: Students may mistakenly believe that only the IP address format changed in IPv6, overlooking the modifications in the packet format.

Explanations: IPv6 introduced several changes to the packet format to enhance efficiency and functionality. These changes include the removal of the Fragment Offset and Flags fields, the addition of a Flow Label field, and the introduction of extension headers. These modifications are integral to the IPv6 protocol and are not limited to just the IP address format and length.

Option Analysis:

Option A: Frame format is not directly related to the changes in IPv6. Frame format pertains to the data link layer, not the network layer where IP addresses and packet formats reside.
Option B: Packet alignment is not a primary change in IPv6. It is more about the structure and fields within the packet.
Option C: Frame bits are related to the data link layer and not directly impacted by changes in IPv6, which focuses on the network layer.
Option D: Packet format is the correct answer as IPv6 introduced significant changes to the packet structure to improve efficiency and functionality.

638. ETSI stands for

Correct Answer: Correct answer is: (D) European Telecommunication Standards Institute.

Exam Relevance: GATE, GRE, GMAT, Professional Certification Exams

Difficulty: Very Easy

Concept notes: ETSI stands for European Telecommunication Standards Institute, which is a non-profit organization that develops globally applicable standards for Information and Communications Technologies (ICT).

Common Mistakes: Students may confuse the acronym with other similar organizations or misremember the exact spelling of the words.

Explanations: ETSI is the correct acronym for the European Telecommunication Standards Institute. This organization focuses on developing standards for telecommunications and information technology, making it a key player in the ICT industry.

Option Analysis:

Option A: Incorrect, as "European Telephone Standards Institute" is not the correct full form of ETSI.
Option B: Incorrect, as "European Telecommunication Systems Institute" is not the correct full form of ETSI.
Option C: Incorrect, as "European Telecom Standards Institute" is not the correct full form of ETSI.
Option D: Correct, as "European Telecommunication Standards Institute" is the accurate full form of ETSI.

639. Main purpose of computer network is

Correct Answer: Correct answer is: (D) All of these.

Exam Relevance: Networking Fundamentals, Computer Science Exams, IT Certification Exams

Difficulty: Easy

Concept notes: The main purpose of a computer network is to facilitate the sharing of resources and information among connected devices.

Common Mistakes: Students may mistakenly believe that only one of the listed options is the main purpose of a computer network, overlooking the comprehensive nature of network functionality.

Explanations: A computer network allows for the sharing of files, printers, and hard disks among connected devices. Each of these functionalities contributes to the overall purpose of a network, which is to enhance resource sharing and communication. Therefore, the correct answer is that all of these options are valid purposes of a computer network.

Option Analysis:

Option A: File sharing is a key function of a computer network, allowing users to access and share documents and files across different devices.
Option B: Printer sharing enables multiple users to print from a single printer, reducing the need for individual printers and saving resources.
Option C: Hard disk sharing allows for the sharing of storage space, enabling users to access and store data on a networked hard drive.
Option D: This option correctly identifies that all of the above are valid purposes of a computer network.

640. In e-mail syste, M..... move the message from the source to the destination.

Correct Answer: Correct answer is: (C) Message transfer agent.

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Moderate

Concept notes: In an email system, the message transfer agent (MTA) is responsible for moving email messages from the source to the destination.

Common Mistakes: Students may confuse the message transfer agent with the user agent, which is responsible for composing and reading emails.

Explanations: The message transfer agent (MTA) is a software component that routes and delivers email messages between different mail servers. It handles the transfer of email messages over the internet, ensuring that messages are delivered to the correct destination. The MTA operates in the background and is not directly interacted with by the end user. It is distinct from the user agent, which is the software used by the end user to compose and read emails.

Option Analysis:

Option A: The user agent is the software used by the end user to compose and read emails, not to transfer messages between servers.
Option B: The browser agent is not a standard term in email systems and does not refer to a component responsible for message transfer.
Option C: The message transfer agent (MTA) is the correct component responsible for moving email messages from the source to the destination.
Option D: The server agent is not a standard term in email systems and does not refer to a component responsible for message transfer.

Mnemonic: MTA moves mail.

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Computer networking MCQ - Set 64

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