Computer networking MCQ – Change your future

891. An ISP provides access to the ..... infrastructure for the users.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: An Internet Service Provider (ISP) provides access to the Internet infrastructure for users.

Common Mistakes: Students may confuse the role of an ISP with providing specific protocols or hardware like routers.

Explanations: An ISP's primary function is to provide users with access to the Internet, which is a global network of interconnected computer networks. The ISP does not provide access to protocols, routers, or layers directly; instead, it facilitates the connection to the broader Internet infrastructure.

Option Analysis:

Option A: Correct. An ISP provides access to the Internet infrastructure.
Option B: Incorrect. Protocols are part of the Internet but not the infrastructure provided by an ISP.
Option C: Incorrect. A router is a device used within the network but not the infrastructure provided by an ISP.
Option D: Incorrect. Layers refer to the OSI model or TCP/IP stack, not the infrastructure provided by an ISP.

892. Which of the following devices takes data sent from one network device and forwards it to the destination node based on MAC address?

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

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

Difficulty: Moderate

Concept notes: A switch is a network device that forwards data based on MAC addresses.

Common Mistakes: Students may confuse a switch with a hub, which broadcasts data to all connected devices rather than forwarding it based on MAC addresses.

Explanations: A switch operates at the data link layer of the OSI model and uses MAC addresses to determine the destination of data packets. It maintains a MAC address table to efficiently forward data to the correct destination port, unlike a hub which broadcasts data to all ports.

Option Analysis:

Option A: A hub is a simple device that broadcasts data to all connected devices, not based on MAC addresses.
Option B: A switch forwards data based on MAC addresses, making it the correct choice.
Option C: A gateway is used to connect different networks and operates at the network layer, not based on MAC addresses.
Option D: A modem is used to convert digital signals to analog and vice versa for transmission over telephone lines, not for forwarding data based on MAC addresses.

Mnemonic: Switch = Smart Forwarding

893. Each packet is routed independently in.....

Correct Answer: Correct answer is: (C) Datagram subnet.

Exam Relevance: Computer Networks, Data Communications, Networking Fundamentals

Difficulty: Moderate

Concept notes: In a datagram subnet, each packet is routed independently, meaning that each packet can take a different path to reach its destination.

Common Mistakes: Students often confuse datagram subnets with virtual circuit subnets, where packets follow a predetermined path.

Explanations: In a datagram subnet, each packet is treated as an independent entity. The routing decision for each packet is made independently at each router, based on the destination address in the packet header. This contrasts with virtual circuit subnets, where a path is established before any packets are sent, and all packets follow this path. Therefore, the correct answer is the datagram subnet.

Option Analysis:

Option A: Virtual circuit subnet does not route packets independently; it establishes a path before packet transmission.
Option B: Short circuit subnet is not a standard term in networking and does not apply to packet routing.
Option C: Datagram subnet routes each packet independently, making it the correct answer.
Option D: ATM subnet uses virtual circuits, not independent packet routing.

Mnemonic: Datagram = Data + Gram (each packet is a separate "gram")

894. Addresses of classes A, B and C are

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: Addresses of classes A, B, and C are used for unicast communication in the Internet Protocol (IP) addressing scheme.

Common Mistakes: Students may confuse unicast with multicast or reserved addresses, which are different types of IP address classifications.

Explanations: In the IP addressing scheme, classes A, B, and C are designated for unicast communication. Unicast addresses are used for one-to-one communication between a single sender and a single receiver. Multicast addresses (Class D) are used for one-to-many communication, and reserved addresses are not used for regular communication. Therefore, the addresses of classes A, B, and C are unicast.

Option Analysis:

Option A: Multicast addresses are in Class D, not A, B, or C.
Option B: Reserved addresses are not used for regular communication and are not in Classes A, B, or C.
Option C: Classes A, B, and C are used for unicast communication.
Option D: Not all of the above are correct; only unicast addresses apply to Classes A, B, and C.

Mnemonic: A, B, C - Unicast, Directly Connect

895. Technique to simplify routing is called the

Correct Answer: Correct answer is: (D) Default Method.

Exam Relevance: CCNA, Network+, CompTIA Network+

Difficulty: Moderate

Concept notes: The default method in networking is a technique used to simplify routing by setting a default route that handles all traffic not specifically addressed by other routes.

Common Mistakes: Students often confuse the default method with other routing techniques such as static or dynamic routing, which do not simplify routing in the same way.

Explanations: The default method simplifies routing by setting a default route that handles all traffic not specifically addressed by other routes. This method is particularly useful in smaller networks where detailed routing tables are not necessary. It reduces the complexity of the routing table and minimizes the need for frequent updates.

Option Analysis:

Option A: The Network Method is not a recognized term for simplifying routing.
Option B: The Error-Control Method is related to ensuring data integrity, not routing simplification.
Option C: The Route Method is a general term and does not specifically refer to simplifying routing.
Option D: The Default Method is the correct term for simplifying routing by setting a default route.

Mnemonic: Default Route, Simplify, All Others

896. Which of the following is considered to be the address after translation?

Correct Answer: Correct answer is: (C) Inside global.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: In network address translation (NAT), the inside global address is the public IP address that is used to represent the private IP address of an internal host on the external network.

Common Mistakes: Students often confuse inside global with outside local, thinking that the outside local address is the translated address used on the external network.

Explanations: The inside global address is the public IP address that is used to represent the private IP address of an internal host on the external network. This address is the one that is visible to external networks after translation, making it the correct answer.

Option Analysis:

Option A: Inside local refers to the private IP address of an internal host before translation.
Option B: Outside local is not a standard term in NAT and is often confused with inside global.
Option C: Inside global is the public IP address used to represent the private IP address on the external network.
Option D: Outside global is the public IP address of an external host, not the translated address of an internal host.

Mnemonic: Inside Global: "IG" for "Internet Gateway"

897. Types of network includes

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

Exam Relevance: IT Essentials, CompTIA Network+, CCNA

Difficulty: Easy

Concept notes: Network types include WAN (Wide Area Network) and LAN (Local Area Network).

Common Mistakes: Students may overlook BAN (Body Area Network) as a less common type, leading to confusion.

Explanations: WANs cover large geographical areas, such as cities or countries, while LANs cover smaller areas like a single building or campus. Both are valid types of networks, making option D the correct answer.

Option Analysis:

Option A: WAN is a valid type of network, but it is not the only type.
Option B: LAN is also a valid type of network, but it is not the only type.
Option C: BAN (Body Area Network) is a less common type of network, but it is not included in the correct answer.
Option D: Both WAN and LAN are valid types of networks, making this the correct answer.

Mnemonic: WANs are Wide, LANs are Local.

898. The main advantage of UDP is

Correct Answer: Correct answer is: (C) Less overload.

Exam Relevance: Computer Networks, Data Communications, Network Security

Difficulty: Easy

Concept notes: UDP (User Datagram Protocol) is a connectionless protocol that does not establish a connection before sending data. This results in less overhead compared to TCP (Transmission Control Protocol), which requires a three-way handshake and maintains a connection.

Common Mistakes: Students often confuse UDP with TCP, thinking that UDP is more reliable because it is used in many applications. However, reliability is not a feature of UDP; it is designed for speed and simplicity.

Explanations: UDP is less overloaded because it does not require the overhead of establishing and maintaining a connection. It sends data packets without checking for acknowledgment, which reduces the amount of data and processing required, making it faster and less resource-intensive.

Option Analysis:

Option A: More overload is incorrect because UDP is designed to minimize overhead.
Option B: Reliable is incorrect because UDP does not guarantee delivery or order of packets.
Option C: Less overload is correct because UDP does not require the overhead of connection establishment and maintenance.
Option D: Fast is a characteristic of UDP, but the question specifically asks for the main advantage, which is less overload.

899. The most important part of a multiple DHCP configurations is to make sure you don't have which of the following in the different scopes? Select the best answer.

Correct Answer: Correct answer is: (A) Duplicate addresses.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Moderate

Concept notes: In a multiple DHCP configurations scenario, ensuring that there are no duplicate addresses across different scopes is crucial to avoid IP address conflicts.

Common Mistakes: Students often confuse duplicate addresses with duplicate pools or subnets, which are less critical issues in DHCP configurations.

Explanations: Duplicate addresses can lead to IP conflicts where multiple devices on a network are assigned the same IP address, causing connectivity issues. While duplicate pools or subnets can be managed through proper configuration, duplicate addresses directly impact the network's functionality. Therefore, ensuring no duplicate addresses in different scopes is the most important part of multiple DHCP configurations.

Option Analysis:

Option A: Correct. Duplicate addresses can cause IP conflicts, which are critical issues in network configurations.
Option B: Incorrect. Duplicate pools can be managed and do not cause the same level of conflict as duplicate addresses.
Option C: Incorrect. Duplicate subnets can be configured to work together, but they do not cause the same level of conflict as duplicate addresses.
Option D: Incorrect. Duplicate default gateways can be managed and do not cause the same level of conflict as duplicate addresses.

900. Hardware documentation normally involves two sets of

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

Exam Relevance: GRE, GMAT, PMP, CISSP

Difficulty: Easy

Concept notes: Hardware documentation typically involves two sets of documentation: one for the hardware itself and another for the installation and maintenance procedures.

Common Mistakes: Students may confuse documentation with other processes like reconciliation or restoration, which are not directly related to the creation of written or digital records about hardware.

Explanations: Hardware documentation is essential for understanding and maintaining hardware systems. It includes technical specifications, user manuals, and maintenance guides. The two sets of documentation usually refer to the technical documentation for the hardware components and the procedural documentation for installation and maintenance.

Option Analysis:

Option A: Reconciliation is not directly related to hardware documentation. It typically involves verifying the accuracy of financial records.
Option B: Documentation is the correct answer as it involves creating and maintaining written or digital records about hardware systems.
Option C: Restoration refers to the process of recovering data or systems, not creating documentation.
Option D: Reconfiguration involves changing the setup or configuration of a system, not creating documentation.

Mnemonic: Docu-Set, Docu-Set

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Computer networking MCQ - Set 90

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