Computer networking MCQ – Change your future

561. What is the value of acknowledgement field in a segment

Correct Answer: Correct answer is: (C) Number of next bytes to receive.

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Moderate

Concept notes: The acknowledgement field in a TCP segment indicates the sequence number of the next byte the receiver expects to receive.

Common Mistakes: Students often confuse the acknowledgement field with the total number of bytes received or the number of previous bytes received.

Explanations: In TCP, the acknowledgement field is used to indicate the sequence number of the next byte the receiver expects to receive. This ensures that the sender knows which byte to send next, maintaining the order and integrity of the data transmission. The acknowledgement field does not represent the total number of bytes received or the number of previous bytes received, but rather the sequence number of the next byte expected.

Option Analysis:

Option A: Incorrect, as the acknowledgement field does not represent the number of previous bytes received.
Option B: Incorrect, as the acknowledgement field does not represent the total number of bytes received.
Option C: Correct, as the acknowledgement field indicates the sequence number of the next byte expected to be received.
Option D: Incorrect, as the acknowledgement field is a numerical value, not a sequence of zeros and ones.

Mnemonic: ACK = Next Byte Expected

562. Which two encryption protocols might be used to provide secure transmissions for browser and web server communications?

Correct Answer: Correct answer is: (B) SSL & TLS.

Exam Relevance: CISSP, CompTIA Security+, CCNA Security

Difficulty: Moderate

Concept notes: Secure Socket Layer (SSL) and Transport Layer Security (TLS) are encryption protocols used to secure communications between a browser and a web server.

Common Mistakes: Students may confuse HTTP and HTTPS as encryption protocols, but they are not. HTTPS uses SSL/TLS for encryption.

Explanations: SSL and TLS are the encryption protocols used to secure data transmissions between a browser and a web server. SSL was the predecessor to TLS, and both protocols ensure that data is encrypted and transmitted securely. HTTP and HTTPS are not encryption protocols; HTTPS uses SSL/TLS to secure the HTTP protocol.

Option Analysis:

Option A: HTTP and HTTPS are not encryption protocols; HTTPS uses SSL/TLS for encryption.
Option B: SSL and TLS are the correct encryption protocols used to secure browser and web server communications.
Option C: SSL is an encryption protocol, but HTTP is not. HTTPS uses SSL/TLS for encryption.
Option D: TCP and UDP are transport layer protocols, not encryption protocols.

563. Unicast is considered a one to one type of communication?

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

Exam Relevance: CCNA, Network+, CompTIA Network+

Difficulty: Very Easy

Concept notes: Unicast communication involves sending data from one source to a single destination.

Common Mistakes: Students may confuse unicast with broadcast or multicast, which involve sending data to multiple destinations.

Explanations: Unicast is a one-to-one communication method where data is sent from a single source to a single destination. This is in contrast to broadcast, which sends data to all devices on a network, and multicast, which sends data to a group of devices. Therefore, the statement that unicast is a one-to-one type of communication is true.

Option Analysis:

Option A: Correct, as unicast is indeed a one-to-one communication method.
Option B: Incorrect, as unicast is not a one-to-many or many-to-many communication method.

Mnemonic: U for Unicast, U for Unique

564. When you create a HOTSPOT from your phone, you are creating which network type?

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

Exam Relevance: Networking Fundamentals, CCNA, CISSP

Difficulty: Easy

Concept notes: A Personal Area Network (PAN) is a network for interconnecting devices centered around an individual's workspace or personal environment. When you create a hotspot from your phone, you are creating a network that allows nearby devices to connect to the internet through your phone's data connection, which is a form of a PAN.

Common Mistakes: Students may confuse a PAN with a LAN (Local Area Network), which is a network that connects computers and devices within a limited geographical area such as a home, school, or office building.

Explanations: A Personal Area Network (PAN) is designed to connect devices within a small area, typically within a few meters. When you create a hotspot from your phone, you are creating a network that allows nearby devices to connect to the internet through your phone's data connection. This network is centered around the individual using the phone, making it a PAN.

Option Analysis:

Option A: LAN (Local Area Network) is incorrect because it refers to a network that connects devices within a larger area, such as a home or office building, not just around an individual.
Option B: WAN (Wide Area Network) is incorrect because it refers to a network that spans a large geographical area, such as a city or country, not a small personal area.
Option C: MAN (Metropolitan Area Network) is incorrect because it refers to a network that spans a city or metropolitan area, not a small personal area.
Option D: PAN (Personal Area Network) is correct because it refers to a network that connects devices within a small area centered around an individual, which is what a phone hotspot does.

Mnemonic: PAN: Personal Area Network, Phone hotspot connects nearby devices.

565. Which class of network addresses is used by government, ISPs and large universities.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: Class A network addresses are used by large organizations such as government agencies, ISPs, and large universities due to their ability to support a large number of devices.

Common Mistakes: Students may confuse Class A with Class B or C, which are used for smaller networks.

Explanations: Class A addresses are designed to support a large number of devices, making them suitable for large organizations such as government agencies, ISPs, and large universities. These organizations often require extensive networking capabilities to support their operations.

Option Analysis:

Option A: Correct. Class A addresses are used by large organizations due to their extensive network capabilities.
Option B: Incorrect. Class B addresses are used for medium-sized networks, not large organizations.
Option C: Incorrect. Class C addresses are used for small networks, not large organizations.
Option D: Incorrect. Class D addresses are reserved for multicast groups and are not used for large organizations.

Mnemonic: A for Agencies, ISPs, Universities

566. 1 bps is a great bandwidth.

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

Exam Relevance: AP Computer Science Principles, SAT Subject Test in Physics

Difficulty: Easy

Concept notes: 1 bps (bit per second) is an extremely low bandwidth, insufficient for most modern data transmission needs.

Common Mistakes: Students may mistakenly believe that 1 bps is a reasonable bandwidth for common data transmission tasks.

Explanations: 1 bps is the rate at which one bit of data is transmitted per second. This is far too slow for practical use in modern communication systems, where even basic internet connections require much higher bandwidths. Therefore, 1 bps is not considered a great bandwidth.

Option Analysis:

Option A: This option is incorrect because 1 bps is not a great bandwidth for modern data transmission needs.
Option B: This option is correct because 1 bps is an extremely low bandwidth, insufficient for most practical applications.

567. Most business FTP servers require user name and passwords because that data is confidential

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

Exam Relevance: CISSP, CompTIA Security+, Network+

Difficulty: Moderate

Concept notes: FTP (File Transfer Protocol) is a standard network protocol used for the transfer of files from one host to another over a TCP-based network, such as the Internet. FTP servers often require user names and passwords to ensure that only authorized users can access and transfer files.

Common Mistakes: Students may confuse FTP with other protocols like HTTP or HTTPS, which are primarily used for web browsing and do not typically require user names and passwords for file transfers.

Explanations: FTP servers require user names and passwords to ensure secure access to confidential data. This authentication mechanism helps prevent unauthorized access and ensures that only authorized users can upload, download, or modify files on the server.

Option Analysis:

Option A: Email Protocol is not used for file transfers and does not typically require user names and passwords for file transfers.
Option B: HTTPS is a secure version of HTTP used for web browsing and does not typically require user names and passwords for file transfers.
Option C: HTTP is used for web browsing and does not typically require user names and passwords for file transfers.
Option D: FTP is the correct answer because it is a protocol specifically designed for file transfers and often requires user names and passwords for secure access.

Mnemonic: FTP: Files Transferred Privately

568. Which of the following network types is made up of nodes connected to a central switch or hub

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

Exam Relevance: CCNA, CompTIA Network+, A+

Difficulty: Easy

Concept notes: In a star network topology, all nodes are connected to a central hub or switch.

Common Mistakes: Students may confuse the star topology with the bus topology, where nodes are connected to a single backbone cable.

Explanations: In a star network, each node is directly connected to a central hub or switch. This central connection point allows for easier management and isolation of network issues. The star topology is widely used in local area networks (LANs) due to its simplicity and reliability.

Option Analysis:

Option A: A mesh network has nodes that are interconnected with many redundant interconnections between network nodes.
Option B: A star network has nodes connected to a central hub or switch.
Option C: A bus network has nodes connected to a single backbone cable.
Option D: A ring network has nodes connected in a circular configuration.

Mnemonic: Star = Central Sun

569. A network consists of a single central cable, which connects all the computers and other devices is known as .....

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

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

Difficulty: Easy

Concept notes: In a bus network, all devices are connected to a single central cable, known as the bus. This cable serves as the backbone of the network, allowing data to be transmitted to all devices connected to it.

Common Mistakes: Students may confuse the bus topology with the star topology, where devices are connected to a central hub rather than a single cable.

Explanations: A bus network is characterized by a single central cable that connects all devices. This cable acts as a shared communication medium, allowing data to be transmitted to all devices connected to it. This matches the description given in the question, making the bus topology the correct answer.

Option Analysis:

Option A: In a star topology, devices are connected to a central hub, not a single cable.
Option B: In a ring topology, devices are connected in a circular loop, not to a single central cable.
Option C: In a bus topology, all devices are connected to a single central cable, which matches the description in the question.
Option D: In a tree topology, devices are connected in a hierarchical structure, not to a single central cable.

Mnemonic: Bus = One Cable, All Devices

570. PAN covers a range of

Correct Answer: Correct answer is: (B) Less than 10 meters.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: PAN (Personal Area Network) is a type of network that connects devices within a very short range, typically around a person.

Common Mistakes: Students may confuse PAN with other types of networks like LAN (Local Area Network) or WLAN (Wireless Local Area Network), which have larger coverage areas.

Explanations: PAN is designed to connect devices within a very limited range, usually within a few meters. The correct answer is that PAN covers a range of less than 10 meters, which aligns with the typical operational range of devices like Bluetooth and infrared connections.

Option Analysis:

Option A: Incorrect, as PAN typically covers a range less than 10 meters, not less than 20 meters.
Option B: Correct, as PAN covers a range of less than 10 meters.
Option C: Incorrect, as PAN covers a range less than 10 meters, not less than 15 meters.
Option D: Incorrect, as PAN covers a range less than 10 meters, not less than 5 meters.

Mnemonic: PAN: Personal Area Network, "P" for "Personal" means "Private" and "Proximity" (less than 10 meters).

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Computer networking MCQ - Set 57

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