Computer networking MCQ

1821. A device that connects two local-area networks (LANs), or two segments of the same LAN. The two LANs being connected can be alike or dissimilar.

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

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

Difficulty: Easy

Concept notes: A bridge is a networking device that connects two local-area networks (LANs) or two segments of the same LAN. It operates at the data link layer (Layer 2) of the OSI model.

Common Mistakes: Students may confuse a bridge with a router, which operates at the network layer (Layer 3) and can connect different types of networks.

Explanations: A bridge is the correct answer because it is specifically designed to connect two LANs or segments of the same LAN. It filters and forwards data frames based on MAC addresses, improving network performance by reducing traffic and preventing loops.

Option Analysis:

Option A: Correct. A bridge connects two LANs or segments of the same LAN.
Option B: Incorrect. "Link" is a general term for a connection between two points and does not specifically refer to a device.
Option C: Incorrect. "Connector" is a physical component used to join cables, not a networking device.
Option D: Incorrect. "Cat5e" is a type of Ethernet cable, not a networking device.

Mnemonic: Bridge = LAN Linker

1822. Identifier that is actually used for data transfer is called the

Correct Answer: Correct answer is: (A) Virtual-circuit identifier.

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Moderate

Concept notes: In a virtual circuit network, the virtual-circuit identifier (VCI) is used to identify a specific connection or path between two endpoints for data transfer.

Common Mistakes: Students may confuse the virtual-circuit identifier with the global address, which is used for routing but not for data transfer.

Explanations: In a virtual circuit network, data is transferred using a predefined path identified by a virtual-circuit identifier. This identifier is unique to the connection and is used to ensure that data packets follow the correct path from source to destination. The global address, local address, and header are not used directly for data transfer in this context.

Option Analysis:

Option A: Correct. The virtual-circuit identifier is used for data transfer in a virtual circuit network.
Option B: Incorrect. The global address is used for routing but not for data transfer.
Option C: Incorrect. The local address is used for addressing within a local network but not for data transfer.
Option D: Incorrect. The header contains control information but is not the identifier used for data transfer.

Mnemonic: VCI for Data, VCI for Path

1823. Number of rounds in Data Encryption Standard algorithm?

Correct Answer: Correct answer is: (C) 16 rounds.

Exam Relevance: CISSP, CompTIA Security+, CCNA Security

Difficulty: Easy

Concept notes: The Data Encryption Standard (DES) algorithm uses a specific number of rounds to encrypt data. Each round involves a series of operations that transform the input data using a key.

Common Mistakes: Students often confuse the number of rounds in DES with other encryption algorithms, such as AES, which uses a different number of rounds.

Explanations: The Data Encryption Standard (DES) algorithm consists of 16 rounds of encryption. Each round involves a series of operations including permutation, substitution, and key mixing. The 16 rounds are a fundamental part of the DES algorithm's design, ensuring a high level of security through multiple iterations of these operations.

Option Analysis:

Option A: 8 rounds is incorrect because DES uses 16 rounds, not 8.
Option B: 12 rounds is incorrect because DES uses 16 rounds, not 12.
Option C: 16 rounds is correct as it is the standard number of rounds in the DES algorithm.
Option D: 24 rounds is incorrect because DES uses 16 rounds, not 24.

Mnemonic: DES Sixteen, Secure Routine

1824. To achieve reliable transport in TCP, ..... is used to check the safe and sound arrival of data.

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

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Easy

Concept notes: In TCP, acknowledgment is used to ensure reliable data transmission by confirming the receipt of data packets.

Common Mistakes: Students may confuse acknowledgment with other mechanisms like checksums or sequence numbers, which are also used in TCP but serve different purposes.

Explanations: TCP uses acknowledgment to verify that data has been received correctly. When a segment of data is sent, the receiver sends an acknowledgment back to the sender, indicating that the data was received successfully. This mechanism ensures that data is transmitted reliably and that any lost or corrupted data can be retransmitted.

Option Analysis:

Option A: Packet is a unit of data transmitted over a network, but it does not ensure reliable transport.
Option B: Buffer is a temporary storage area for data, but it does not ensure reliable transport.
Option C: Segment is a unit of data in TCP, but it does not ensure reliable transport.
Option D: Acknowledgment is used to confirm the receipt of data, ensuring reliable transport.

Mnemonic: A for Acknowledgment, A for Assurance.

1825. ISP is .....

Correct Answer: Correct answer is: (A) Internet Service Provider.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Very Easy

Concept notes: ISP stands for Internet Service Provider, which is a company that provides individuals and businesses with access to the internet.

Common Mistakes: Students may confuse ISP with other acronyms that start with "I" and "S," such as Internet Subscriber Provider.

Explanations: ISP is the correct term for a company that provides internet access. The acronym stands for Internet Service Provider, which accurately describes the role of these companies in providing internet services to customers.

Option Analysis:

Option A: Correct. ISP stands for Internet Service Provider.
Option B: Incorrect. ISP does not stand for Internet Service Partner.
Option C: Incorrect. ISP does not stand for Internet Subscriber Provider.
Option D: Incorrect. ISP does not stand for Internet Subscriber Partner.

1826. In Frequency Hopping Spread Spectrum (FHSS), sender and receiver can have privacy if hopping period is

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

Exam Relevance: IEEE 802.11, Wireless Communication Exams, Network Security Exams

Difficulty: Moderate

Concept notes: In Frequency Hopping Spread Spectrum (FHSS), a short hopping period enhances privacy by making it difficult for unauthorized parties to predict the frequency sequence.

Common Mistakes: Students may mistakenly believe that a longer hopping period would provide better privacy, as it might seem to offer more time to change frequencies.

Explanations: A short hopping period in FHSS ensures that the frequency changes rapidly, making it challenging for eavesdroppers to intercept the communication. This rapid change in frequency sequence reduces the window of opportunity for unauthorized parties to decode the signal, thereby enhancing privacy.

Option Analysis:

Option A: Correct. A short hopping period increases privacy by making frequency prediction difficult.
Option B: Incorrect. A long hopping period would not provide the same level of privacy as a short one.
Option C: Incorrect. A zero hopping period would mean no frequency hopping, thus no privacy benefit.
Option D: Incorrect. An infinite hopping period is not practical and would not provide privacy benefits.

Mnemonic: Short Hops, Tight Security

1827. Which term is described as a "worldwide network of computers made up of cables, routers, and other pieces of hardware used to connect devices together"? a) World Wide Web b) Internetc) Local networkd) 4G

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

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

Difficulty: Easy

Concept notes: The Internet is a global network of interconnected computers and devices that communicate with each other using standardized protocols.

Common Mistakes: Students may confuse the Internet with the World Wide Web, which is a service that operates over the Internet.

Explanations: The Internet is defined as a worldwide network of computers connected by cables, routers, and other hardware. It enables devices to communicate and share data across the globe. The World Wide Web, on the other hand, is a service that operates over the Internet and provides access to web pages and other resources.

Option Analysis:

Option A: Correct. The Internet is the correct term for the global network of computers and devices.
Option B: Incorrect. A local network is a smaller network confined to a specific location, such as a home or office.
Option C: Incorrect. 4G refers to a mobile network technology, not a global network of computers.
Option D: Incorrect. The World Wide Web is a service that operates over the Internet, not the network itself.

1828. A..... is an extension of an enterprise's private intranet across a public network such as the internet, creating a secure private connection.

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

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Easy

Concept notes: A Virtual Private Network (VPN) extends an enterprise's private intranet across a public network, such as the internet, creating a secure private connection.

Common Mistakes: Students may confuse the term with other network acronyms like VNP, VSN, or VSPN, which are not standard terms.

Explanations: A Virtual Private Network (VPN) is a technology that creates a secure connection over a less secure network, such as the internet. It allows remote users to securely access a private network and its resources. The term "VPN" is the correct acronym for this technology, which extends an enterprise's private intranet across a public network, ensuring secure communication.

Option Analysis:

Option A: VNP is not a standard term and does not refer to a secure network extension.
Option B: VPN is the correct term for a secure network extension over a public network.
Option C: VSN is not a standard term and does not refer to a secure network extension.
Option D: VSPN is not a standard term and does not refer to a secure network extension.

1829. Routing tables of a router keeps track of

Correct Answer: Correct answer is: (D) Routes to use for forwarding data to its destination.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: Routing tables in a router contain information about the best paths to forward data packets to their destinations.

Common Mistakes: Students may confuse routing tables with other network tables such as ARP tables or DHCP tables.

Explanations: Routing tables are essential components of routers that store information about the best paths to forward data packets to their destinations. They do not manage MAC address assignments, port assignments, or IP address distribution. Instead, they keep track of routes to use for forwarding data to its destination.

Option Analysis:

Option A: MAC Address Assignments are managed by ARP tables, not routing tables.
Option B: Port Assignments to network devices are handled by the network's configuration and not by routing tables.
Option C: Distributing IP addresses to network devices is the responsibility of DHCP servers, not routing tables.
Option D: Routing tables keep track of routes to use for forwarding data to its destination, which is the correct function.

1830. Transmission media are directly controlled by the

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

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Easy

Concept notes: The physical layer is responsible for the transmission and reception of unstructured raw data between a device and a physical 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 is directly responsible for the transmission and reception of raw data over the physical medium. It deals with the electrical, mechanical, and functional specifications for the physical layer. This includes the type of cables, connectors, and signals used for data transmission. Therefore, the physical layer directly controls the transmission media.

Option Analysis:

Option A: Correct. The physical layer is responsible for the transmission and reception of raw data over the physical medium.
Option B: Incorrect. The data link layer is responsible for error-free transfer of data frames between nodes on the same network, not the transmission media.
Option C: Incorrect. The network layer is responsible for the routing of data packets between different networks, not the transmission media.
Option D: Incorrect. The session layer is responsible for establishing, managing, and terminating sessions between applications, not the transmission media.

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Computer networking MCQ - Set 183

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