Computer networking MCQ – Change your future

251. In IPv6, the..... field in the base header and the sender IP address combine to indicate a unique path identifier for a specific flow of data.

Correct Answer: Correct answer is: (A) Flow label.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The flow label in IPv6 is a 20-bit field in the base header that, when combined with the source IP address, can be used to identify a specific flow of data packets.

Common Mistakes: Students may confuse the flow label with the next header field, which specifies the type of extension header that follows the base header.

Explanations: The flow label in IPv6 is designed to identify a specific flow of data packets. When combined with the sender's IP address, it can be used to indicate a unique path identifier for that flow. This allows for efficient handling of data flows, such as prioritizing certain types of traffic or ensuring that packets from the same flow follow the same path through the network.

Option Analysis:

Option A: Correct. The flow label, when combined with the sender's IP address, can indicate a unique path identifier for a specific flow of data.
Option B: Incorrect. The next header field specifies the type of extension header that follows the base header, not a unique path identifier.
Option C: Incorrect. The hop limit field specifies the maximum number of hops a packet can traverse before being discarded, not a unique path identifier.
Option D: Incorrect. The destination IP address specifies where the packet is going, not a unique path identifier for a specific flow of data.

Mnemonic: Flow Label: "FL" for "Flow Label"

252. A DEVICE WHICH ESTABLISHES A TEMPORARY CONNECTION ONLY BETWEEN THE INTENDED NODES FOR TRANSMISSION OF DATA .

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

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Moderate

Concept notes: A switch establishes a temporary connection between intended nodes for data transmission.

Common Mistakes: Students may confuse switches with hubs, which broadcast data to all connected devices rather than establishing a direct connection.

Explanations: A switch creates a temporary connection between the intended nodes for data transmission. This means that when a switch receives data, it forwards the data only to the intended recipient, rather than broadcasting it to all connected devices. This targeted approach increases efficiency and reduces network congestion. A router, on the other hand, routes data between different networks, and a hub simply broadcasts data to all connected devices without establishing a direct connection.

Option Analysis:

Option A: Correct. A switch establishes a temporary connection between intended nodes for data transmission.
Option B: Incorrect. A router routes data between different networks, not between intended nodes within a single network.
Option C: Incorrect. A hub broadcasts data to all connected devices, not establishing a temporary connection between intended nodes.
Option D: Incorrect. The correct answer is provided in the options.

Mnemonic: S-T-R: Switch Temporarily Routes

253. ..... system is used for ground based radio broadcasting.

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

Exam Relevance: GATE, GRE, IEEE exams

Difficulty: Moderate

Concept notes: ALOHA is a random access protocol used in computer networks and radio broadcasting systems. It allows multiple users to share a common communication channel without prior coordination.

Common Mistakes: Students may confuse ALOHA with other channel allocation methods like static or dynamic channel allocation, which are not typically used in ground-based radio broadcasting.

Explanations: ALOHA is used for ground-based radio broadcasting because it allows multiple transmitters to share a common channel without the need for centralized control. This makes it suitable for scenarios where multiple transmitters need to communicate without prior coordination, such as in ground-based radio broadcasting systems.

Option Analysis:

Option A: Static channel allocation is not suitable for ground-based radio broadcasting as it requires predefined channel assignments, which is not practical for multiple transmitters.
Option B: Dynamic channel allocation requires a central controller to manage channel assignments, which is not typically used in ground-based radio broadcasting.
Option C: ALOHA is a random access protocol that allows multiple transmitters to share a common channel without prior coordination, making it suitable for ground-based radio broadcasting.
Option D: CSMA (Carrier Sense Multiple Access) is another random access protocol, but ALOHA is specifically mentioned as the correct answer in this context.

Mnemonic: ALOHA: Always Listen Or Hold And Attempt

254. The Corporate router receives an IP packet with a source IP address of 192.168.214.20 and a destination address of 192.168.22.3. Looking at the output from the Corporate router, what will the router do with this packet? Corp#sh ip route [output cut] R 192.168.215.0 [120/2] via 192.168.20.2, 00:00:23, Serial0/0 R 192.168.115.0 [120/1] via 192.168.20.2, 00:00:23, Serial0/0 R 192.168.30.0 [120/1] via 192.168.20.2, 00:00:23, Serial0/0 C 192.168.20.0 is directly connected, Serial0/0 C 192.168.214.0 is directly connected, FastEthernet0/0

Correct Answer: Correct answer is: (A) The packet will be discarded.

Exam Relevance: CCNA, Network+

Difficulty: Moderate

Concept notes: The router will discard the packet if it does not have a route to the destination network.

Common Mistakes: Students may mistakenly think the packet will be routed out the Fa0/0 interface because the source IP address is in the directly connected network.

Explanations: The destination IP address 192.168.22.3 does not match any of the routes listed in the routing table. The router has no route to the destination network 192.168.22.0/24. Therefore, the packet will be discarded.

Option Analysis:

Option A: Correct. The packet will be discarded because there is no route to the destination network.
Option B: Incorrect. The packet will not be routed out the S0/0 interface as there is no route to the destination network.
Option C: Incorrect. The router will not broadcast looking for the destination as it does not perform broadcasts for unknown destinations.
Option D: Incorrect. The packet will not be routed out the Fa0/0 interface as the destination network is not directly connected to this interface.

Mnemonic: No mnemonic provided.

255. The set of rules that govern how packets are transmitted over a network

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: IP (Internet Protocol) is the set of rules that govern how packets are transmitted over a network.

Common Mistakes: Students may confuse IP with other protocols like ICMP, SMTP, or POP, which have specific functions but do not govern packet transmission rules.

Explanations: IP is responsible for defining the structure of packets and the rules for addressing and routing packets across networks. It ensures that data is sent from a source to a destination, making it the correct answer for the set of rules governing packet transmission.

Option Analysis:

Option A: IP is the correct answer as it defines the rules for packet transmission.
Option B: ICMP (Internet Control Message Protocol) is used for error reporting and diagnostics, not for governing packet transmission rules.
Option C: SMTP (Simple Mail Transfer Protocol) is used for sending email messages, not for governing packet transmission rules.
Option D: POP (Post Office Protocol) is used for receiving email messages, not for governing packet transmission rules.

Mnemonic: IP: Internet Packets

256. Most new readers present newsgroups articles in

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

Exam Relevance: GRE, GMAT, IT Certification Exams

Difficulty: Easy

Concept notes: Newsgroups articles are typically organized into threads, which group related messages together.

Common Mistakes: Students may confuse threads with mail or columns, which are different organizational structures.

Explanations: Newsgroups articles are presented in threads to maintain the context and continuity of discussions. Threads allow users to follow a specific conversation or topic, making it easier to read and respond to related messages.

Option Analysis:

Option A: Mail is not the correct answer as it refers to individual messages rather than a structured discussion format.
Option B: Column is not the correct answer as it does not represent the typical organization of newsgroup articles.
Option C: Threads are the correct answer as they are the standard way to organize and present newsgroup articles.
Option D: None of the above is incorrect because threads are indeed the correct way to present newsgroup articles.

Mnemonic: Think "Thread" as the "T" in "Talks Together."

257. A problem with a bus topology is that

Correct Answer: Correct answer is: (B) Performance gets worse with more computers/traffic.

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Moderate

Concept notes: In a bus topology, all devices share a single communication line. As more devices are added or traffic increases, the shared line can become congested, leading to decreased performance.

Common Mistakes: Students may mistakenly believe that the bus topology is the most expensive or requires the most cabling, which are not accurate.

Explanations: In a bus topology, all devices are connected to a single communication line. When more devices are added or the traffic increases, the shared line can become congested, leading to increased latency and decreased performance. This is because the communication line must handle all the data from every device, and as the number of devices or the amount of data increases, the line becomes a bottleneck.

Option Analysis:

Option A: This is incorrect because a bus topology typically requires less cabling compared to other topologies like star or mesh.
Option B: This is correct because the shared communication line in a bus topology can become congested with more devices or traffic, leading to decreased performance.
Option C: This is incorrect because a bus topology is generally less expensive to install compared to other topologies.
Option D: This is incorrect because managing a bus topology is relatively straightforward, as all devices are connected to a single line.

Mnemonic: Bus gets bogged down with more traffic.

258. A VPN is.....

Correct Answer: Correct answer is: (A) A secure connection over a public network (the internet).

Exam Relevance: CISSP, CompTIA Security+, CCNA Security

Difficulty: Easy

Concept notes: A Virtual Private Network (VPN) is a technology that creates a secure connection over a public network, such as the internet, to provide privacy and anonymity.

Common Mistakes: Students may confuse a VPN with a dedicated physical connection or think it is only accessible within a company's Local Area Network (LAN).

Explanations: A VPN is designed to provide a secure connection over a public network, such as the internet. It encrypts data and routes it through a secure tunnel, ensuring that the information transmitted is protected from unauthorized access. This makes it distinct from a dedicated physical connection, which is a separate and isolated network link. It also differs from unsecured information transmission and is not limited to a company's LAN.

Option Analysis:

Option A: Correct. A secure connection over a public network (the internet) accurately describes a VPN.
Option B: Incorrect. A dedicated separate physical connection is not a characteristic of a VPN.
Option C: Incorrect. A VPN encrypts data, making it secure, not unsecured.
Option D: Incorrect. A VPN can be used by anyone with internet access, not just within a company's LAN.

259. Select one of server application in an office

Correct Answer: Correct answer is: (C) Print Server.

Exam Relevance: IT Essentials, CompTIA A+, Network+

Difficulty: Easy

Concept notes: A print server is a server application that manages print jobs and directs them to the appropriate printer in a networked environment.

Common Mistakes: Students may confuse a print server with other types of servers, such as application servers or image servers, which have different functions.

Explanations: A print server is specifically designed to manage and distribute print jobs across a network. It acts as an intermediary between the computers sending print jobs and the printers that execute them. This makes it a common and essential component in an office setting where multiple users need to print documents.

Option Analysis:

Option A: A game server is used for multiplayer online games and is not typically found in an office environment.
Option B: An image server is used for storing and serving images and is not a standard office application.
Option C: A print server is used to manage print jobs in a networked office environment, making it a common and necessary server application.
Option D: An application server hosts and runs applications for client devices, which is not the same as managing print jobs.

Mnemonic: Print Server: "Prints Serve Office Needs"

260. An agent is a host or computer that runs the SNMP..... process.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: An agent in the context of SNMP (Simple Network Management Protocol) is a software process that runs on a managed device, such as a router or switch, and provides information to a management station.

Common Mistakes: Students may confuse the agent with a client process, thinking it requests information rather than provides it.

Explanations: The agent in SNMP is a server process because it listens for requests from a management station (the client) and responds with information about the managed device. The agent does not initiate requests but rather serves the information to the client upon request.

Option Analysis:

Option A: Incorrect, as the agent does not act as a client in SNMP. It does not initiate requests but responds to them.
Option B: Correct, as the agent is a server process that responds to requests from a management station.
Option C: Incorrect, as the agent is specifically a server process, not both a client and a server.
Option D: Incorrect, as the agent is specifically a server process.

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Computer networking MCQ - Set 26

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