Computer networking MCQ

1121. Computer network is a collection of

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: A computer network is a collection of interconnected computing devices that can exchange data and share resources.

Common Mistakes: Students may mistakenly think that a computer network is only composed of servers or clients, overlooking the broader definition that includes all types of computing devices.

Explanations: A computer network is defined as a collection of computers that are connected to each other to share resources and data. While servers and clients are components of a network, the network itself is fundamentally a collection of computers. This includes various types of computing devices such as desktops, laptops, and servers.

Option Analysis:

Option A: Servers are part of a network but do not encompass the entire network.
Option B: Clients are part of a network but do not encompass the entire network.
Option C: Applications run on computers but are not the network itself.
Option D: Computers are the fundamental components that make up a network.

1122. ..... provides authentication at the IP level.

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

Exam Relevance: CISSP, CCNA Security, CompTIA Security+

Difficulty: Moderate

Concept notes: Authentication Header (AH) provides authentication at the IP level, ensuring the integrity and authenticity of the IP packet.

Common Mistakes: Students may confuse AH with ESP, which provides confidentiality and integrity but not authentication at the IP level.

Explanations: AH provides authentication at the IP level by adding a header to the IP packet that includes a hash of the packet's contents. This hash is used to verify the integrity and authenticity of the packet, ensuring that it has not been tampered with during transmission.

Option Analysis:

Option A: AH provides authentication at the IP level.
Option B: ESP provides confidentiality and integrity but not authentication at the IP level.
Option C: PGP is used for email encryption and does not operate at the IP level.
Option D: SSL operates at the transport layer and not at the IP level.

1123. Twisted pair cable in which metal casing improves penetration of noise or crosstalk is called

Correct Answer: Correct answer is: (B) Shielded twisted pair cable.

Exam Relevance: Network+, CompTIA A+, CCNA

Difficulty: Easy

Concept notes: Shielded twisted pair (STP) cable includes a metal casing that helps to reduce electromagnetic interference (EMI) and crosstalk.

Common Mistakes: Students may confuse shielded twisted pair with unshielded twisted pair, which lacks the metal casing.

Explanations: Shielded twisted pair cable has a metal casing that acts as a shield to protect the cable from external electromagnetic interference and crosstalk. This shielding improves the cable's ability to resist noise penetration, making it suitable for environments with high levels of electromagnetic interference.

Option Analysis:

Option A: Insulated twisted pair cable does not have a metal casing to shield against noise.
Option B: Shielded twisted pair cable includes a metal casing that reduces noise and crosstalk.
Option C: Unshielded twisted pair cable lacks the metal casing to protect against noise.
Option D: Both A and B is incorrect because only B is the correct type of cable with the metal casing.

1124. The physical layer translates logical communication requests from the..... into hardware specific operations.

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

Exam Relevance: Networking Fundamentals, CCNA, CISSP

Difficulty: Easy

Concept notes: The physical layer is responsible for converting logical communication requests into hardware-specific operations. It interfaces directly with the hardware and the transmission medium.

Common Mistakes: Students may confuse the physical layer with the data link layer, which is responsible for error-free transfer of data frames between nodes on the same network.

Explanations: The physical layer translates logical communication requests from the data link layer into hardware-specific operations. The data link layer is the layer immediately above the physical layer in the OSI model and is responsible for the reliable transfer of data frames. The physical layer then takes these frames and converts them into electrical, optical, or radio signals for transmission.

Option Analysis:

Option A: Correct. The physical layer translates logical communication requests from the data link layer into hardware-specific operations.
Option B: Incorrect. The network layer is responsible for routing and addressing, not for translating logical communication requests into hardware-specific operations.
Option C: Incorrect. The transport layer is responsible for end-to-end communication and flow control, not for translating logical communication requests into hardware-specific operations.
Option D: Incorrect. The application layer is the highest layer in the OSI model and is responsible for providing services to the user, not for translating logical communication requests into hardware-specific operations.

1125. This is a type of computer network that spans a small area, building or group of buildings. It is usually owned, managed, and controlled by a single entity or organization.

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

Exam Relevance: CCNA, CompTIA Network+, ITIL Foundation

Difficulty: Easy

Concept notes: A Local Area Network (LAN) is a computer network that connects computers and devices within a limited area such as a home, school, or office building.

Common Mistakes: Students may confuse LAN with WAN (Wide Area Network), which covers a larger geographical area.

Explanations: A Local Area Network (LAN) is a type of computer network that spans a small area, such as a building or group of buildings. It is typically owned, managed, and controlled by a single entity or organization. This matches the description given in the question, making it the correct answer.

Option Analysis:

Option A: Computer Networks is a broad term that includes various types of networks, not specific to the small area described.
Option B: Local Area Network (LAN) is the correct term for a network that spans a small area and is owned by a single entity.
Option C: Wide Area Network (WAN) covers a larger geographical area, which does not match the description in the question.
Option D: Wi-Fi is a wireless technology used for network connections, but it does not define the type of network described in the question.

Mnemonic: LAN - Local Area Network

1126. Which is true regarding EIGRP successor routes? 1. A successor route is used by EIGRP to forward traffic to a destination. 2. Successor routes are saved in the topology table to be used if the primary route fails. 3. Successor routes are flagged as "active" in the routing table. 4. A successor route may be backed up by a feasible successor route. 5. Successor routes are stored in the neighbor table following the discovery process.

Correct Answer: Correct answer is: (C) 1 and 4.

Exam Relevance: CCNA, CCNP, Network+

Difficulty: Moderate

Concept notes: In EIGRP, a successor route is the best path to a destination and is used to forward traffic. A feasible successor route is a backup path that can be used if the successor route fails.

Common Mistakes: Students often confuse the roles of successor and feasible successor routes, thinking that feasible successors are the primary routes used for traffic forwarding.

Explanations: A successor route is the best path to a destination and is used by EIGRP to forward traffic. This makes statement 1 true. A feasible successor route is a backup path that can be used if the primary route (successor) fails. This makes statement 4 true. Statements 2, 3, and 5 are incorrect because successor routes are not saved in the topology table as backups, are not flagged as "active" in the routing table, and are not stored in the neighbor table.

Option Analysis:

Option A: Incorrect because statement 3 is false.
Option B: Incorrect because statement 2 is false.
Option C: Correct because statements 1 and 4 are true.
Option D: Incorrect because statements 3 and 5 are false.

Mnemonic: S-F: Successor forwards, Feasible follows.

1127. User Datagram Protocol (UDP) is stored in an IP datagram with a total length of

Correct Answer: Correct answer is: (D) 65, 535 bytes.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The maximum size of a UDP datagram, including the UDP header and data, is limited by the maximum size of an IP datagram.

Common Mistakes: Students often confuse the maximum size of a UDP datagram with the maximum size of the UDP header alone, which is much smaller.

Explanations: The maximum size of an IP datagram is 65,535 bytes, which is the maximum value that can be represented by the 16-bit total length field in the IP header. Since UDP datagrams are encapsulated within IP datagrams, the maximum size of a UDP datagram, including the 8-byte UDP header, is also 65,535 bytes.

Option Analysis:

Option A: 65, 505 bytes is incorrect because it is below the maximum size of an IP datagram.
Option B: 65, 515 bytes is incorrect because it is below the maximum size of an IP datagram.
Option C: 65, 525 bytes is incorrect because it is below the maximum size of an IP datagram.
Option D: 65, 535 bytes is correct because it is the maximum size of an IP datagram, which is the upper limit for UDP datagrams as well.

1128. Methods of delivery are

Correct Answer: Correct answer is: (D) Both A & B.

Exam Relevance: CAT, GMAT, GRE, MBA Entrance Exams

Difficulty: Easy

Concept notes: Methods of delivery can be categorized into direct and indirect delivery. Direct delivery involves the immediate transfer of goods or services to the end user, while indirect delivery involves intermediaries or channels between the producer and the end user.

Common Mistakes: Students may mistakenly believe that only one type of delivery method exists, overlooking the distinction between direct and indirect delivery.

Explanations: Direct delivery involves the producer sending goods or services directly to the consumer without any intermediaries. Indirect delivery involves the use of intermediaries such as distributors, wholesalers, or retailers to deliver goods or services to the consumer. Both methods are valid and commonly used, hence the correct answer is both A and B.

Option Analysis:

Option A: Direct Delivery is a valid method of delivery.
Option B: Indirect Delivery is also a valid method of delivery.
Option C: Random Delivery is not a recognized method of delivery.
Option D: Both A and B are correct, as both direct and indirect delivery are valid methods.

Mnemonic: Direct = D, Indirect = I, Both = D & I

1129. . ..... allows LAN users to share computer programs and data.

Correct Answer: Correct answer is: (C) File server.

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

Difficulty: Moderate

Concept notes: A file server is a computer or device on a network that is dedicated to storing, managing, and providing access to files and data for other computers on the network.

Common Mistakes: Students may confuse a file server with a print server, which is specifically designed to manage printing tasks rather than file sharing.

Explanations: A file server allows LAN users to share computer programs and data by providing centralized storage and access to files. This enables multiple users to access and modify the same files, promoting collaboration and efficient resource management.

Option Analysis:

Option A: A communication server is designed to facilitate communication between different devices on a network, not specifically for sharing files and programs.
Option B: A print server manages printing tasks and does not primarily focus on sharing files and programs.
Option C: A file server is the correct choice as it is designed to store and share files and programs among multiple users on a network.
Option D: A network is a system of interconnected devices, but it does not specifically refer to a device that shares files and programs.

Mnemonic: File Server: "Files Shared Everywhere, Really"

1130. In DNS solution to problems is to distribute information among many computers known as

Correct Answer: Correct answer is: (B) DNS Server.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: DNS (Domain Name System) servers are responsible for translating domain names into IP addresses. They are distributed across the internet to ensure that the DNS system can handle a large volume of requests and provide redundancy.

Common Mistakes: Students may confuse DNS servers with DNS clients, which are the devices that request DNS resolution, not the ones that provide it.

Explanations: DNS servers are the computers that store and distribute DNS information. They are part of a distributed system that ensures that domain name resolution is efficient and reliable. DNS clients send requests to these servers to resolve domain names into IP addresses.

Option Analysis:

Option A: DNS Client is incorrect because clients request DNS resolution, not distribute information.
Option B: DNS Server is correct because servers are the computers that store and distribute DNS information.
Option C: DNS Provider is incorrect because it is not a standard term in DNS architecture.
Option D: DNS Recipient is incorrect because recipients do not distribute DNS information.

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Computer networking MCQ - Set 113

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