Computer networking MCQ

991. Bluetooth network consists of one primary device and up to

Correct Answer: Correct answer is: (B) 7 Devices.

Exam Relevance: Computer Networks, Wireless Communication, Network Protocols

Difficulty: Easy

Concept notes: A Bluetooth network, also known as a piconet, can consist of one primary device and up to seven secondary devices.

Common Mistakes: Students may confuse the number of devices in a Bluetooth network with other wireless network standards or may not be familiar with the specific limit of Bluetooth piconets.

Explanations: A Bluetooth network, or piconet, is designed to support one primary device (the master) and up to seven secondary devices (slaves). This configuration ensures that the network remains small and manageable, allowing for efficient communication and coordination among the devices.

Option Analysis:

Option A: Incorrect, as the maximum number of devices in a Bluetooth network is not 5.
Option B: Correct, as the maximum number of devices in a Bluetooth network is 7.
Option C: Incorrect, as the maximum number of devices in a Bluetooth network is not 9.
Option D: Incorrect, as the maximum number of devices in a Bluetooth network is not 11.

Mnemonic: Piconet, 1 Master, 7 Slaves.

992. The process-to-process delivery of the entire message is the responsibility of the..... layer.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The transport layer is responsible for end-to-end delivery of messages between processes on different hosts.

Common Mistakes: Students may confuse the transport layer with the network layer, which is responsible for routing packets between different networks.

Explanations: The transport layer ensures that the entire message is delivered reliably from the source process to the destination process. It handles segmentation, reassembly, flow control, and error checking. The network layer, on the other hand, is responsible for routing packets across different networks, but does not guarantee end-to-end delivery of the entire message.

Option Analysis:

Option A: The network layer is responsible for routing packets between different networks, not for the end-to-end delivery of messages between processes.
Option B: The transport layer is responsible for the end-to-end delivery of messages between processes, ensuring reliability and integrity of the entire message.
Option C: The application layer is the highest layer in the OSI model and deals with user applications, not with the delivery of messages between processes.
Option D: The physical layer is responsible for the transmission of raw bit streams over a physical medium, not for the delivery of messages between processes.

993. ..... cable is used for voice and data communications.

Correct Answer: Correct answer is: (C) Twisted-pair.

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

Difficulty: Easy

Concept notes: Twisted-pair cables are commonly used for both voice and data communications due to their cost-effectiveness and suitability for short to medium distances.

Common Mistakes: Students may confuse twisted-pair cables with coaxial cables, which are primarily used for cable television and some types of data transmission.

Explanations: Twisted-pair cables are widely used in local area networks (LANs) and telephone systems. They consist of pairs of insulated wires twisted together to reduce crosstalk and electromagnetic interference. This makes them suitable for both voice and data transmission over short to medium distances.

Option Analysis:

Option A: Coaxial cables are primarily used for cable television and some data transmission, but not commonly for voice communications.
Option B: Fiber-optic cables are used for high-speed data transmission over long distances, but are not typically used for voice communications in standard telephone systems.
Option C: Twisted-pair cables are used for both voice and data communications, making them the correct choice.
Option D: This option is incorrect as twisted-pair cables are indeed used for voice and data communications.

Mnemonic: Think "T" for "Twisted-pair" and "T" for "Telephone" and "Technology".

994. An internet is a

Correct Answer: Correct answer is: (B) Network of networks.

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Easy

Concept notes: An internet is a large-scale network that connects multiple smaller networks, allowing them to communicate and share resources.

Common Mistakes: Students may confuse the internet with a collection of LANs or WANs, overlooking the broader concept of interconnected networks.

Explanations: The internet is fundamentally a network of networks, connecting various local area networks (LANs) and wide area networks (WANs) globally. This interconnected structure allows for the sharing of information and resources across different geographical locations and organizational boundaries.

Option Analysis:

Option A: Incorrect, as the internet is not limited to a collection of WANs.
Option B: Correct, as the internet is a network of interconnected networks.
Option C: Incorrect, as the internet is not limited to a collection of LANs.
Option D: Incorrect, as the internet is not limited to identical LANs and WANs.

995. Transport layer of OSI model lies between Network and..... layer.

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

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

Difficulty: Easy

Concept notes: The transport layer in the OSI model is responsible for end-to-end communication between applications. It lies between the network layer, which handles the routing of data, and the session layer, which manages sessions between applications.

Common Mistakes: Students may confuse the transport layer with the data link layer, which is responsible for physical transmission of data over a network.

Explanations: The transport layer is directly above the network layer and directly below the session layer. The network layer is responsible for routing data packets across networks, while the session layer manages the establishment, maintenance, and termination of sessions between applications. Therefore, the transport layer lies between the network and session layers.

Option Analysis:

Option A: The application layer is the topmost layer in the OSI model, not adjacent to the transport layer.
Option B: The data link layer is below the network layer, not adjacent to the transport layer.
Option C: The session layer is directly above the transport layer, making this the correct answer.
Option D: The presentation layer is above the session layer, not adjacent to the transport layer.

996. In the Internet, the domain name space (tree) is divided into..... different sections:

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: The domain name space in the Internet is divided into three main sections: generic top-level domains (gTLDs), country code top-level domains (ccTLDs), and infrastructure top-level domains.

Common Mistakes: Students may confuse the division of the domain name space with the hierarchical structure of domain names, which includes multiple levels such as second-level and third-level domains.

Explanations: The domain name space in the Internet is divided into three main sections: generic top-level domains (gTLDs), country code top-level domains (ccTLDs), and infrastructure top-level domains. This division is fundamental to understanding the structure of the Internet's domain name system.

Option Analysis:

Option A: Correct. The domain name space is divided into three main sections.
Option B: Incorrect. The division is not into two sections.
Option C: Incorrect. The division is not into four sections.
Option D: Incorrect. The division is not into five sections.

Mnemonic: GCI: Generic, Country, Infrastructure

997. If delays are recorded as 10 bit numbers in a 50 router network, and delay vectors are exchanged twice a second, how much bandwidth per fill duplex line is occupied by the distributed routing algorithm?

Correct Answer: Correct answer is: (D) 1000 bps.

Exam Relevance: Computer Networks, Data Communications, Network Protocols

Difficulty: Moderate

Concept notes: In a distributed routing algorithm, each router sends its delay vector to all other routers. The delay vector contains the delay information for each router in the network.

Common Mistakes: Students may overlook the fact that delay vectors are exchanged twice per second, leading to an incorrect calculation of bandwidth.

Explanations: Each delay is recorded as a 10-bit number. In a 50-router network, each router sends a delay vector containing 50 delay values. Therefore, each delay vector is 500 bits (50 routers * 10 bits per delay). Since delay vectors are exchanged twice per second, the total bandwidth used per full duplex line is 1000 bps (500 bits * 2 exchanges per second).

Option Analysis:

Option A: 500 bps is incorrect because it does not account for the two exchanges per second.
Option B: 1500 bps is incorrect because it overestimates the bandwidth required.
Option C: 5 bps is incorrect because it significantly underestimates the bandwidth required.
Option D: 1000 bps is correct as it accurately reflects the bandwidth used for two exchanges per second.

998. In Stream Control Transmission Protocol (SCTP), checksum is of

Correct Answer: Correct answer is: (B) 32 Bits.

Exam Relevance: Computer Networks, Data Communication, Network Security

Difficulty: Easy

Concept notes: The Stream Control Transmission Protocol (SCTP) uses a 32-bit checksum for error detection.

Common Mistakes: Students may confuse SCTP with other protocols that use different checksum sizes, such as TCP which uses a 16-bit checksum.

Explanations: SCTP employs a 32-bit checksum to ensure data integrity. This checksum is calculated over the entire SCTP packet, including the header and data, to detect any errors that may have occurred during transmission. The 32-bit size provides a balance between error detection capability and computational overhead.

Option Analysis:

Option A: 16 Bits is incorrect because SCTP uses a larger checksum for better error detection.
Option B: 32 Bits is correct as it is the standard size for SCTP checksums.
Option C: 64 Bits is incorrect because it is larger than necessary for SCTP's error detection requirements.
Option D: 128 Bits is incorrect as it is excessively large for SCTP checksums.

999. A(n)..... is the interface between a user and an ATM switch.

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

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

Difficulty: Easy

Concept notes: The UNI (User Network Interface) is the interface between a user and an ATM switch.

Common Mistakes: Students may confuse UNI with NNI (Network-to-Network Interface), which is the interface between two ATM switches.

Explanations: The UNI is the point where a user's equipment connects to the ATM network. It is the interface that allows users to access the services provided by the ATM switch. The NNI, on the other hand, is used for interconnection between different ATM switches within the network.

Option Analysis:

Option A: Correct. UNI is the correct interface between a user and an ATM switch.
Option B: Incorrect. NNI is the interface between two ATM switches, not between a user and an ATM switch.
Option C: Incorrect. NNN is not a standard term in ATM networks.
Option D: Incorrect. The correct answer is provided in the options.

Mnemonic: UNI: User Network Interface

1000. In OSI network architecture, the routing is performed by

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: In the OSI model, the Network layer is responsible for routing data packets between different networks.

Common Mistakes: Students often confuse the Network layer with the Data Link layer, which is responsible for node-to-node delivery within the same network.

Explanations: The Network layer is responsible for routing data packets between different networks. It determines the best path for data to travel from the source to the destination, using routing protocols and algorithms. This layer is crucial for inter-network communication, ensuring that data packets are efficiently and correctly delivered across multiple networks.

Option Analysis:

Option A: Correct. The Network layer is responsible for routing data packets between different networks.
Option B: Incorrect. The Data Link layer is responsible for node-to-node delivery within the same network, not routing between different networks.
Option C: Incorrect. The Transport layer is responsible for end-to-end communication and does not handle routing between different networks.
Option D: Incorrect. The Session layer is responsible for establishing, maintaining, and terminating connections between applications, not for routing.

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Computer networking MCQ - Set 100

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