Computer networking MCQ

1111. DNS represents..... structure.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: DNS (Domain Name System) represents a hierarchical structure, which is often visualized as a tree structure.

Common Mistakes: Students may confuse DNS with other network topologies like bus, loop, or ring, which are physical network layouts rather than hierarchical structures.

Explanations: DNS is a hierarchical naming system for computers, services, or other resources connected to the Internet or a private network. The structure of DNS is organized in a tree-like hierarchy, with the root domain at the top and subdomains branching out below it. This hierarchical structure allows for efficient and scalable management of domain names and their associated IP addresses.

Option Analysis:

Option A: DNS does not represent a bus structure, which is a type of network topology where all devices are connected to a single communication line.
Option B: DNS does not represent a loop structure, which is a network topology where devices are connected in a circular configuration.
Option C: DNS represents a tree structure, which is a hierarchical structure with a root domain and subdomains branching out.
Option D: DNS does not represent a ring structure, which is a network topology where devices are connected in a closed loop.

Mnemonic: DNS Tree: Domains Nest Subdomains

1112. An employee at a branch office is creating a quote for a customer. In order to do this, the employee needs to access confidential pricing information from internal servers at the Head Office. What type of network would the employee access?

Correct Answer: Correct answer is: (A) An Intranet.

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Moderate

Concept notes: An intranet is a private network that is used within an organization, allowing employees to access internal resources securely.

Common Mistakes: Students may confuse an intranet with the internet, which is a public network, or an extranet, which is a private network that extends to external users.

Explanations: The employee needs to access confidential pricing information from internal servers at the Head Office. An intranet is the appropriate network for this purpose as it is a private network used within an organization, ensuring secure access to internal resources.

Option Analysis:

Option A: Correct. An intranet is a private network used within an organization, suitable for accessing confidential information.
Option B: Incorrect. The internet is a public network and not suitable for accessing confidential internal information.
Option C: Incorrect. An extranet is a private network that extends to external users, not appropriate for internal confidential information.
Option D: Incorrect. A local area network (LAN) is limited to a specific location and does not typically span across different office locations.

Mnemonic: Intranet: Internal Network

1113. Parallel transmission is good in speed but it is very

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

Exam Relevance: Computer Science Exams, Networking Exams, Data Communication Exams

Difficulty: Moderate

Concept notes: Parallel transmission involves sending multiple bits simultaneously over multiple lines, which increases speed but requires more physical lines and hardware, making it costly.

Common Mistakes: Students may confuse parallel transmission with serial transmission, which is less costly but slower.

Explanations: Parallel transmission requires multiple lines to send data simultaneously, which increases the speed of data transfer. However, this setup is costly due to the need for additional hardware and physical lines. Therefore, while parallel transmission is faster, it is also more expensive compared to serial transmission.

Option Analysis:

Option A: Parallel transmission is not cheap because it requires multiple lines and hardware.
Option B: Parallel transmission is costly due to the need for multiple lines and hardware.
Option C: Parallel transmission is not time-consuming; it is actually faster than serial transmission.
Option D: While parallel transmission is costly, it is not necessarily time-consuming.

1114. A wireless network interface can work in

Correct Answer: Correct answer is: (C) Both a and b.

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

Difficulty: Easy

Concept notes: A wireless network interface can operate in both infrastructure mode and ad hoc mode.

Common Mistakes: Students may mistakenly believe that a wireless network interface can only operate in one mode at a time.

Explanations: In infrastructure mode, wireless devices connect to a central access point, which provides connectivity to other devices and the internet. In ad hoc mode, wireless devices communicate directly with each other without the need for an access point. Therefore, a wireless network interface can function in both modes, making option C the correct answer.

Option Analysis:

Option A: Infrastructure mode is one of the correct modes, but it is not the only mode.
Option B: Ad hoc mode is also a correct mode, but it is not the only mode.
Option C: Both infrastructure and ad hoc modes are correct, making this the comprehensive answer.
Option D: This option is incorrect as both infrastructure and ad hoc modes are valid.

1115. Which of the following statements is TRUE about CSMA/CD?

Correct Answer: Correct answer is: (C) CSMA/CD is not suitable for a high propagation delay network like satellite network.

Exam Relevance: CCNA, CompTIA Network+, IEEE 802 standards

Difficulty: Moderate

Concept notes: CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is a protocol used in Ethernet networks to manage data transmission and detect collisions. It is not suitable for networks with high propagation delays, such as satellite networks, due to the time it takes for signals to travel and return.

Common Mistakes: Students often misunderstand that CSMA/CD can be used in any network environment, not realizing the limitations imposed by high propagation delays.

Explanations: CSMA/CD relies on the ability to detect collisions within a short time frame. In a network with high propagation delay, such as a satellite network, the time it takes for a signal to travel to the receiver and back is significant. This delay can cause the protocol to fail in detecting collisions promptly, leading to inefficiencies and potential data loss. Therefore, CSMA/CD is not suitable for networks with high propagation delays.

Option Analysis:

Option A: IEEE 802.11 wireless LAN does not use CSMA/CD; it uses CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance).
Option B: Ethernet is based on the CSMA/CD protocol for managing data transmission and collision detection.
Option C: CSMA/CD is not suitable for networks with high propagation delays, such as satellite networks, due to the time it takes for signals to travel and return.
Option D: CSMA/CD involves contention for the shared medium, where multiple devices compete to transmit data.

1116. Fragmentation means.....

Correct Answer: Correct answer is: (B) Breaking large packet into small packets.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: Fragmentation is the process of breaking down large data packets into smaller, more manageable units to facilitate transmission over a network.

Common Mistakes: Students often confuse fragmentation with packet combining or forwarding, which are different processes in network communication.

Explanations: Fragmentation is necessary when a large packet exceeds the maximum transmission unit (MTU) of a network segment. The large packet is divided into smaller fragments that can be transmitted individually. Each fragment is then reassembled at the destination to reconstruct the original packet.

Option Analysis:

Option A: This describes the opposite of fragmentation, which is combining small packets into a larger one, not fragmentation.
Option B: This correctly describes fragmentation as the process of breaking large packets into smaller packets.
Option C: This describes the process of combining large packets into a single packet, which is not fragmentation.
Option D: This describes packet forwarding, which is a different process from fragmentation.

1117. A list of protocols used by a syste, M one protocol per layer, is called

Correct Answer: Correct answer is: (B) Protocol stack.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: A protocol stack is a set of protocols used by a system, with one protocol per layer, typically arranged in a hierarchical order.

Common Mistakes: Students may confuse protocol stack with protocol suite, which refers to a collection of protocols that work together but are not necessarily organized by layers.

Explanations: A protocol stack is the correct term for a list of protocols used by a system, with each protocol corresponding to a specific layer in the network model. This hierarchical arrangement ensures that each layer communicates with its corresponding layer on the other end of the network, facilitating structured communication.

Option Analysis:

Option A: Protocol architecture is not a standard term used to describe a list of protocols per layer.
Option B: Protocol stack is the correct term for a list of protocols used by a system, with one protocol per layer.
Option C: Protocol suite refers to a collection of protocols that work together but does not necessarily imply a layered structure.
Option D: None of the mentioned is incorrect as protocol stack is a valid and widely used term.

Mnemonic: Stack it up, layer by layer.

1118. The IEEE designation for Fast Ethernet is ?

Correct Answer: Correct answer is: (C) 802.3.

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

Difficulty: Easy

Concept notes: The IEEE 802.3 standard specifies the physical and data link layer protocols for Ethernet networks, including Fast Ethernet.

Common Mistakes: Students may confuse the IEEE 802.3 standard with other IEEE standards, such as 802.1 for bridging and management, or 802.11 for wireless LANs.

Explanations: The IEEE 802.3 standard is the correct designation for Fast Ethernet. This standard covers the physical and data link layer protocols for Ethernet networks, including Fast Ethernet which operates at 100 Mbps. The other options (802.1, 801.2, and 803.2) are not valid IEEE designations for Fast Ethernet.

Option Analysis:

Option A: 802.1 is incorrect as it pertains to bridging and management, not Ethernet.
Option B: 801.2 is not a valid IEEE standard.
Option C: 802.3 is the correct standard for Ethernet, including Fast Ethernet.
Option D: 803.2 is not a valid IEEE standard.

1119. Roaming is feature of

Correct Answer: Correct answer is: (A) Cellular Telephony.

Exam Relevance: GATE, GRE, GMAT, JE

Difficulty: Easy

Concept notes: Roaming is a feature that allows a mobile device to maintain connectivity when it moves outside its home network area and connects to a different network.

Common Mistakes: Students may confuse roaming with other cellular features such as handover or signal strength.

Explanations: Roaming is a feature of cellular telephony that enables a mobile device to connect to a different network when it is outside its home network area. This feature is essential for maintaining connectivity when traveling. The other options (Cellular End-Caller, Cellular Frames, Cellular Signals) do not directly relate to the concept of roaming.

Option Analysis:

Option A: Correct. Roaming is a feature of cellular telephony.
Option B: Incorrect. Cellular End-Caller is not a recognized term in the context of roaming.
Option C: Incorrect. Cellular Frames are not related to the concept of roaming.
Option D: Incorrect. Cellular Signals are a part of cellular telephony but do not define the feature of roaming.

1120. Domain Name System (DNS), allows domains to be divided further into

Correct Answer: Correct answer is: (D) Sub-Domains.

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Easy

Concept notes: The Domain Name System (DNS) allows domains to be divided into smaller, more specific segments known as sub-domains.

Common Mistakes: Students may confuse sub-domains with other domain-related terms such as top-level domains or second-level domains.

Explanations: The DNS system enables the creation of sub-domains, which are additional segments added to a domain name to create more specific or specialized addresses. For example, "blog.example.com" is a sub-domain of "example.com". This hierarchical structure allows for a more organized and detailed naming system within a domain.

Option Analysis:

Option A: Large-Domains is not a recognized term in DNS terminology.
Option B: Down-Domains is not a recognized term in DNS terminology.
Option C: Super-Domains is not a recognized term in DNS terminology.
Option D: Sub-Domains is the correct term used in DNS to describe the division of domains into smaller segments.

Mnemonic: Sub-Domains: "Sub" for "Subordinate" or "Secondary" domains.

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Computer networking MCQ - Set 112

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