Computer networking MCQ – Change your future

741. Artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication

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

Exam Relevance: AP Physics, SAT Subject Test in Physics, AS/A-Level Physics

Difficulty: Easy

Concept notes: A satellite is an artificial object placed in orbit around a celestial body, such as the Earth or Moon, to collect data or facilitate communication.

Common Mistakes: Students might confuse the term "satellite" with other technological terms like "Ethernet" or "Client," which are unrelated to space technology.

Explanations: A satellite is an artificial body designed to orbit celestial bodies like the Earth or Moon. It is used for various purposes, including collecting information and facilitating communication. The other options, such as Ethernet, Country, and Client, do not fit the description of an object in orbit.

Option Analysis:

Option A: Ethernet is a technology for connecting computers in a local area network and is not related to space technology.
Option B: Country refers to a nation or territory and is not an artificial body placed in orbit.
Option C: Client is a term used in computing to describe a device or program that requests services from a server and is not related to space technology.
Option D: Satellite is the correct term for an artificial body placed in orbit around a celestial body for various purposes, including data collection and communication.

742. The PSTN is an example of a..... network.

Correct Answer: Correct answer is: (B) Circuit switched.

Exam Relevance: Computer Networks, Telecommunications, Network Fundamentals

Difficulty: Easy

Concept notes: The PSTN (Public Switched Telephone Network) is a traditional telephone network that uses circuit switching to establish a dedicated communication path between two points for the duration of a call.

Common Mistakes: Students may confuse the PSTN with packet switching, which is used in modern data networks like the Internet.

Explanations: The PSTN uses circuit switching, where a dedicated path is established between two points for the duration of the call. This ensures a consistent and reliable connection for voice communication. Packet switching, on the other hand, breaks data into packets and routes them independently, which is not suitable for real-time voice communication.

Option Analysis:

Option A: Packet switching is used in data networks like the Internet, not in the PSTN.
Option B: Circuit switching is the correct choice for the PSTN, as it establishes a dedicated path for the duration of the call.
Option C: Message switching is an older method where messages are stored and forwarded, not used in the PSTN.
Option D: This option is incorrect as the PSTN is a well-defined circuit-switched network.

Mnemonic: Circuit Switched: "Call Set Up, Stay Connected"

743. The first line of HTTP request message is called.....

Correct Answer: Correct answer is: (A) Request line.

Exam Relevance: Computer Networks, Web Development, Software Engineering

Difficulty: Easy

Concept notes: The first line of an HTTP request message contains the method, the request-URI, and the HTTP version. This line is known as the request line.

Common Mistakes: Students often confuse the request line with the header line, which follows the request line and contains additional information about the request.

Explanations: The first line of an HTTP request message is called the request line. It includes the HTTP method (such as GET, POST), the request-URI (the resource being requested), and the HTTP version (such as HTTP/1.1). This line is distinct from the header line, which follows the request line and contains additional metadata about the request.

Option Analysis:

Option A: Correct. The first line of an HTTP request message is the request line.
Option B: Incorrect. The header line follows the request line and contains additional information about the request.
Option C: Incorrect. The status line is part of the HTTP response, not the request.
Option D: Incorrect. There is no entity line in an HTTP request message.

Mnemonic: Remember: "R" for Request line, "H" for Header line, "S" for Status line.

744. In a multiplexed syste, M..... lines share the bandwidth of..... link.

Correct Answer: Correct answer is: (C) N; 1.

Exam Relevance: GATE, IEEE, ECE exams

Difficulty: Moderate

Concept notes: In a multiplexed system, multiple lines (N) share the bandwidth of a single link (1). This allows efficient use of the link by dividing the bandwidth among several channels.

Common Mistakes: Students often confuse the number of lines with the number of links, leading to incorrect selection of options.

Explanations: Multiplexing is a technique where multiple signals or data streams are combined and transmitted over a single communication channel. In this context, N lines share the bandwidth of a single link, making option C the correct answer. This ensures efficient use of the link by allowing multiple data streams to be transmitted simultaneously.

Option Analysis:

Option A: Incorrect because it suggests only one line shares the bandwidth of multiple links, which is not the principle of multiplexing.
Option B: Incorrect because it suggests only one line shares the bandwidth of a single link, which does not utilize the concept of multiplexing.
Option C: Correct because it accurately represents the principle of multiplexing where multiple lines share the bandwidth of a single link.
Option D: Incorrect because it suggests multiple lines share the bandwidth of multiple links, which is not the principle of multiplexing.

Mnemonic: N lines, 1 link, share and save.

745. A section connecting two neighbor devices is called

Correct Answer: Correct answer is: (C) Optical Link.

Exam Relevance: Networking Exams, Optical Communication Exams, Telecommunications Exams

Difficulty: Easy

Concept notes: An optical link is a physical connection between two devices that uses optical fibers to transmit data.

Common Mistakes: Students may confuse optical link with optical channel link, which refers to a specific frequency band within an optical fiber.

Explanations: An optical link is the correct term for a section connecting two neighboring devices using optical fibers. This connection facilitates the transmission of data between the devices.

Option Analysis:

Option A: An optical station is not a term used for the connection between devices.
Option B: An optical server is a device, not a connection between devices.
Option C: An optical link is the correct term for the connection between two devices using optical fibers.
Option D: An optical channel link refers to a specific frequency band within an optical fiber, not the entire connection between devices.

746. Networks where end user workstations are tied to LAN servers to share resources and application processing.

Correct Answer: Correct answer is: (D) Client/Server networks.

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Moderate

Concept notes: Client/Server networks involve end user workstations (clients) that connect to central servers to share resources and application processing.

Common Mistakes: Students may confuse Client/Server networks with peer-to-peer networks, where each computer can act as both a client and a server.

Explanations: In Client/Server networks, end user workstations (clients) are tied to LAN servers to share resources and application processing. This architecture centralizes data and processing tasks on the server, allowing clients to access shared resources and applications efficiently. The correct answer, Client/Server networks, accurately describes this network configuration.

Option Analysis:

Option A: Internetworked enterprise refers to a network of interconnected networks within an organization, not specifically to the client/server model.
Option B: Information super highway is a term for the internet, not a specific network architecture.
Option C: Business applications of telecommunications refers to the use of telecommunications in business, not a specific network configuration.
Option D: Client/Server networks correctly describes the network where end user workstations are tied to LAN servers to share resources and application processing.

747. In Stream Control Transmission Protocol (SCTP), only DATA chunks consume

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

Exam Relevance: Computer Networks, Network Protocols, SCTP

Difficulty: Moderate

Concept notes: In SCTP, TSN (Transmission Sequence Number) is used to track the sequence of DATA chunks. Only DATA chunks consume TSNs, as they are the primary units of data transmission in SCTP.

Common Mistakes: Students often confuse TSN with other sequence numbers like SSN (Stream Sequence Number) or SI (Stream Identifier), which are used for different purposes in SCTP.

Explanations: TSN is specifically designed to ensure the correct order and reliability of DATA chunks. Each DATA chunk is assigned a TSN, which is incremented for each new DATA chunk sent. This ensures that the receiver can reassemble the data in the correct order, even if packets are lost or arrive out of order. Other chunks like CONTROL chunks do not consume TSNs because they do not carry user data.

Option Analysis:

Option A: PSTN is not related to SCTP and is a term used in traditional telephony.
Option B: TSN is the correct answer as it is used to track the sequence of DATA chunks in SCTP.
Option C: SSN is used to track the sequence of DATA chunks within a specific stream, but it does not consume TSNs.
Option D: SI is used to identify the stream within which a DATA chunk is sent, but it does not consume TSNs.

Mnemonic: TSN tracks DATA, not CONTROL.

748. B8ZS substitutes eight consecutive zeros with

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

Exam Relevance: GATE, ECE, EE, Telecommunications Engineering Exams

Difficulty: Moderate

Concept notes: B8ZS (Bipolar with 8-zero substitution) is a line code used in digital communications to ensure that long sequences of zeros do not cause synchronization issues. It substitutes eight consecutive zeros with a specific pattern to maintain signal integrity.

Common Mistakes: Students often confuse the exact pattern used in B8ZS with other line coding schemes, such as HDB3, which uses a different substitution pattern.

Explanations: B8ZS substitutes eight consecutive zeros with the pattern OOOVBOVB. This pattern ensures that the signal does not contain long sequences of zeros, which can cause synchronization problems in the receiver. The pattern OOOVBOVB includes both positive and negative voltage levels, which helps maintain the signal's integrity and allows the receiver to maintain synchronization.

Option Analysis:

Option A: Incorrect because the pattern OOOVB1VB does not match the B8ZS substitution rule.
Option B: Correct because OOOVBOVB is the correct pattern used in B8ZS to substitute eight consecutive zeros.
Option C: Incorrect because the pattern 111VBOVB does not match the B8ZS substitution rule.
Option D: Incorrect because the pattern O1OVBOVB does not match the B8ZS substitution rule.

Mnemonic: B8ZS: "OOOVBOVB" - "Oh Oh Oh Very Big Oh Very Big"

749. Different computers are connected to a LAN by a cable and a/an

Correct Answer: Correct answer is: (B) Interface card.

Exam Relevance: AP Computer Science Principles, CompTIA Network+, CCNA

Difficulty: Easy

Concept notes: An interface card, also known as a network interface card (NIC), is used to connect a computer to a local area network (LAN).

Common Mistakes: Students may confuse the function of a modem with that of an interface card, as both are used for network connections.

Explanations: An interface card is specifically designed to connect a computer to a LAN. It provides the necessary hardware and software to enable communication between the computer and the network. A modem, on the other hand, is used to connect to a wide area network (WAN) or the internet, typically over telephone lines or cable connections. Special wires and telephone lines are not specific devices for connecting to a LAN.

Option Analysis:

Option A: A modem is used for connecting to the internet or WAN, not specifically for LAN connections.
Option B: An interface card is the correct device for connecting a computer to a LAN.
Option C: Special wires are not a specific device; they are part of the physical connection but do not provide the necessary interface.
Option D: Telephone lines are used for connecting to the internet or WAN, not for LAN connections.

Mnemonic: NIC for LAN, not WAN.

750. Which one of these does not lie in the Link Layer of the TCP/IP Model?

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The TCP/IP model divides network communication into four layers: Application, Transport, Internet, and Link. The Link Layer is responsible for the physical transmission of data over a network medium. IP (Internet Protocol) operates at the Internet Layer, not the Link Layer.

Common Mistakes: Students may confuse IP with Link Layer protocols because IP is often associated with networking, which can include physical connections.

Explanations: IP operates at the Internet Layer of the TCP/IP model, where it handles addressing and routing of packets between different networks. The Link Layer, on the other hand, deals with the physical transmission of data over a network medium, such as Ethernet or Wi-Fi. Therefore, IP does not lie in the Link Layer.

Option Analysis:

Option A: DSL (Digital Subscriber Line) is a technology for transmitting digital data over telephone lines, which operates at the Link Layer.
Option B: IP (Internet Protocol) operates at the Internet Layer, not the Link Layer.
Option C: SONET (Synchronous Optical Network) is a standard for transmitting multiple digital signals at high speeds over optical fiber, which operates at the Link Layer.
Option D: 802.11 is a set of standards for wireless local area networks (WLANs), which operates at the Link Layer.

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Computer networking MCQ - Set 75

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