Computer networking MCQ – Change your future

271. Bus is a type of topology.

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

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: Bus topology is a network configuration where all devices are connected to a single communication line or "bus".

Common Mistakes: Students may confuse bus topology with other network topologies like ring or star.

Explanations: In a bus topology, all devices are connected to a single shared communication line, known as the bus. This line acts as a common medium for data transmission. Since the question asks if bus is a type of topology, the answer is true.

Option Analysis:

Option A: Correct, as bus is indeed a type of network topology.
Option B: Incorrect, as bus is a recognized network topology.
Option C: Incorrect, as the statement is definitively true.
Option D: Incorrect, as the statement can be verified as true.

Mnemonic: Bus = Big Unified System

272. Transmission mode in which multiple bits are sent with each clock trick is

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

Exam Relevance: Computer Networks, Digital Electronics, Data Communication

Difficulty: Easy

Concept notes: In parallel transmission, multiple bits are sent simultaneously over multiple lines with each clock tick.

Common Mistakes: Students may confuse parallel transmission with serial transmission, where bits are sent one at a time.

Explanations: Parallel transmission involves sending multiple bits at once, each on a separate line, synchronized by a clock signal. This is in contrast to serial transmission, where bits are sent one at a time over a single line.

Option Analysis:

Option A: Correct. Parallel transmission sends multiple bits simultaneously.
Option B: Incorrect. Serial transmission sends bits one at a time.
Option C: Incorrect. Synchronous transmission refers to timing, not the number of bits sent.
Option D: Incorrect. Asynchronous transmission also refers to timing, not the number of bits sent.

Mnemonic: Parallel = Many Lines, Serial = Single Line

273. This is the family of specifications for wireless local area networks (WLANs) developed by a working group of the Institute of Electrical and Electronics Engineers (IEEE).

Correct Answer: Correct answer is: (B) 802.11.

Exam Relevance: IEEE certification exams, CompTIA Network+, CCNA

Difficulty: Easy

Concept notes: The IEEE 802.11 standard defines the specifications for wireless local area networks (WLANs).

Common Mistakes: Students may confuse 802.11 with other IEEE standards like 802.3 (Ethernet) or 802.5 (Token Ring).

Explanations: The IEEE 802.11 standard is specifically designed for wireless local area networks (WLANs). It encompasses various protocols and technologies that enable wireless communication between devices within a local network. This standard is widely recognized and implemented in most wireless networking devices, making it the correct choice for the given question.

Option Analysis:

Option A: 3G is a mobile network technology, not a WLAN standard.
Option B: 802.11 is the correct standard for wireless local area networks.
Option C: 802.3 is the standard for Ethernet, which is a wired LAN technology.
Option D: 802.5 is the standard for Token Ring, another wired LAN technology.

Mnemonic: 802.11: "Wireless Wi-Fi"

274. ..... control refers to methods of error detection and correction.

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

Exam Relevance: Networking exams, Computer Science exams, Telecommunications exams

Difficulty: Easy

Concept notes: Error control refers to methods used to detect and correct errors in data transmission.

Common Mistakes: Students may confuse error control with flow control, which manages the rate of data transmission.

Explanations: Error control is specifically designed to ensure data integrity by detecting and correcting errors that occur during transmission. This is distinct from other forms of control like flow control, which focuses on managing the rate of data flow to prevent overflow or underflow in the communication channel.

Option Analysis:

Option A: Flow control manages the rate of data transmission, not error detection and correction.
Option B: Error control is the correct term for methods of error detection and correction.
Option C: Transmission control is a broader term that includes both flow control and error control, but does not specifically refer to error detection and correction.
Option D: None of the above is incorrect as error control is a valid and specific term.

Mnemonic: ECC - Error Control Correct

275. In..... forwarding, the routing table holds the address of just the next hop instead of complete route information.

Correct Answer: Correct answer is: (A) Next-hop.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: In next-hop forwarding, the routing table contains the address of the next immediate router to which a packet should be sent, rather than the complete path to the destination.

Common Mistakes: Students may confuse next-hop forwarding with default routing, where the routing table contains a single default route for all unknown destinations.

Explanations: Next-hop forwarding simplifies the routing process by only requiring the router to know the address of the next router in the path. This reduces the complexity and size of the routing table, as it does not need to store the entire route to the destination. The router forwards the packet to the next hop, which then repeats the process until the packet reaches its destination.

Option Analysis:

Option A: Correct. Next-hop forwarding involves storing the address of the next immediate router in the routing table.
Option B: Incorrect. Network-specific routing involves more detailed routing information for specific networks, not just the next hop.
Option C: Incorrect. Host-specific routing involves routing information for specific hosts, not just the next hop.
Option D: Incorrect. Default routing involves a single default route for all unknown destinations, not the next hop.

Mnemonic: Next Hop, Not Full Hop

276. Command to test the continuity of the computer network

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

Exam Relevance: CCNA, CompTIA Network+, ITIL Foundation

Difficulty: Easy

Concept notes: The ping command is used to test the reachability of a host on an Internet Protocol (IP) network.

Common Mistakes: Students may confuse the ping command with other network diagnostic tools like ipconfig, which is used to display network configuration details.

Explanations: The ping command sends ICMP Echo Request packets to a specified IP address or hostname and waits for a response. This helps in determining if the network connection is active and the latency of the connection. The other options do not serve the purpose of testing network continuity.

Option Analysis:

Option A: Cmd is a command-line interface for Windows, not a specific network testing command.
Option B: Exit is a command to close a command prompt or exit a program, not related to network testing.
Option C: Ipconfig displays IP configuration details but does not test network continuity.
Option D: Ping is the correct command to test network continuity by sending packets to a host and receiving responses.

277. An agreed-upon set of procedures and rules

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: A protocol is a set of rules and procedures that govern how data is transmitted and received over a network.

Common Mistakes: Students may confuse protocol with specific protocols like TCP or IP, which are examples of protocols rather than the general concept.

Explanations: A protocol is defined as an agreed-upon set of procedures and rules that govern the communication between devices in a network. This makes it the correct answer as it directly matches the given definition.

Option Analysis:

Option A: TCP is a specific protocol, not the general concept of a protocol.
Option B: IP is another specific protocol, not the general concept of a protocol.
Option C: WEB is not a protocol but a term related to the World Wide Web.
Option D: Protocol is the correct term for an agreed-upon set of procedures and rules.

278. The computation of the shortest path in OSPF is usually done by

Correct Answer: Correct answer is: (C) Dijkstra's algorithm.

Exam Relevance: CCNA, CCNP, Network+

Difficulty: Moderate

Concept notes: Dijkstra's algorithm is used to find the shortest path in a graph, which is essential for routing protocols like OSPF.

Common Mistakes: Students may confuse Dijkstra's algorithm with other routing algorithms like Bellman-Ford, which is also used for shortest path but in different contexts.

Explanations: OSPF (Open Shortest Path First) uses Dijkstra's algorithm to compute the shortest path between nodes in a network. This algorithm is optimal for finding the shortest path in a graph with non-negative edge weights, which is typical in network routing scenarios. Dijkstra's algorithm ensures that OSPF can efficiently determine the best path for data transmission, minimizing the cost or distance between nodes.

Option Analysis:

Option A: Bellman-ford algorithm is used for finding the shortest paths from a single source in a weighted graph, but it is not the primary algorithm used by OSPF.
Option B: Routing information protocol (RIP) is a distance-vector routing protocol, not an algorithm for computing shortest paths.
Option C: Dijkstra's algorithm is the correct choice as it is used by OSPF to compute the shortest path in a network.
Option D: Distance vector routing is a routing protocol, not an algorithm for computing shortest paths.

Mnemonic: Dijkstra's Delivers Directly

279. Which device performs the function of determining the path that messages should take through internetworks?

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: A router is a device that determines the best path for data packets to travel through a network.

Common Mistakes: Students may confuse a router with a firewall, which primarily focuses on security rather than routing.

Explanations: A router performs the function of determining the path that messages should take through internetworks. It uses routing protocols and algorithms to find the most efficient path for data packets to travel from the source to the destination. This is a core function of routers in network infrastructure.

Option Analysis:

Option A: Correct. A router determines the path that messages should take through internetworks.
Option B: Incorrect. A firewall is a security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
Option C: Incorrect. A web server is a computer system that hosts websites and serves web pages to users.
Option D: Incorrect. A DSL modem is a device that connects a computer or network to a digital subscriber line for internet access.

Mnemonic: Routers Route, Firewalls Filter

280. In a simple echo-request message, the value of the sum is 01010000 01011100. Then, value of checksum is

Correct Answer: Correct answer is: (A) 10101111 10100011.

Exam Relevance: Computer Networks, Data Communication, Network Protocols

Difficulty: Moderate

Concept notes: The checksum in an echo-request message is calculated by taking the one's complement of the sum of the message fields.

Common Mistakes: Students often confuse the one's complement with the two's complement, leading to incorrect checksum values.

Explanations: To find the checksum, we first need to take the one's complement of the given sum. The given sum is 01010000 01011100. The one's complement of a binary number is obtained by flipping all the bits (changing 0s to 1s and 1s to 0s). Therefore, the one's complement of 01010000 01011100 is 10101111 10100011. This is the correct checksum value.

Option Analysis:

Option A: This is the correct checksum value obtained by taking the one's complement of the given sum.
Option B: This is the original sum, not the checksum.
Option C: This is incorrect as it does not represent the one's complement of the given sum.
Option D: This is incorrect as it does not represent the one's complement of the given sum.

Mnemonic: One's complement: Flip all bits.

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Computer networking MCQ - Set 28

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