Computer networking MCQ – Change your future

301. In the.....Protocol, if no acknowledgment for a frame has arrived, we resend all outstanding frames.

Correct Answer: Correct answer is: (B) Go-Back-N ARQ.

Exam Relevance: Computer Networks, Data Communications, Network Protocols

Difficulty: Moderate

Concept notes: In Go-Back-N ARQ, if an acknowledgment for a frame is not received, all unacknowledged frames are retransmitted.

Common Mistakes: Students may confuse Go-Back-N ARQ with Selective-Repeat ARQ, where only the specific unacknowledged frames are retransmitted.

Explanations: Go-Back-N ARQ operates by sending multiple frames before waiting for an acknowledgment. If an acknowledgment for a frame is not received, the sender retransmits all frames that have not yet been acknowledged. This ensures that any lost or corrupted frames are resent, maintaining the integrity of the data transmission.

Option Analysis:

Option A: Stop-and-Wait ARQ only resends the last frame sent if an acknowledgment is not received.
Option B: Go-Back-N ARQ resends all unacknowledged frames if an acknowledgment is not received.
Option C: Selective-Repeat ARQ only resends the specific frames that were not acknowledged.
Option D: This option is incorrect as Go-Back-N ARQ is the correct protocol for the described behavior.

Mnemonic: G-B-N: Go-Back-N, Go Back to the Beginning and Resend.

302. Consider the following Statements: Firewalls remove viruses A LAN or (local area network) connects computers across the world. A computer network require both hardware and software. Which of the following statement(s) is/are true?

Correct Answer: Correct answer is: (C) Only 3.

Exam Relevance: AP Computer Science Principles, CompTIA Network+

Difficulty: Easy

Concept notes: Firewalls do not remove viruses; they primarily control network traffic based on security rules. A LAN connects computers within a limited area, not across the world. A computer network does require both hardware and software to function.

Common Mistakes: Students may incorrectly believe that firewalls can remove viruses or that a LAN can connect computers globally.

Explanations: Firewalls are designed to monitor and control network traffic based on security rules, not to remove viruses. A LAN (Local Area Network) connects computers within a limited area, such as a home or office, not across the world. A computer network requires both hardware (like routers and switches) and software (like network protocols) to function properly.

Option Analysis:

Option A: Incorrect because firewalls do not remove viruses and a LAN does not connect computers across the world.
Option B: Incorrect because firewalls do not remove viruses.
Option C: Correct because a computer network requires both hardware and software.
Option D: Incorrect because firewalls do not remove viruses and a LAN does not connect computers across the world.

303. IGMP helps a..... router create and update a list of loyal members related to each router interface.

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

Exam Relevance: CCNA, CCNP, Network+

Difficulty: Moderate

Concept notes: IGMP (Internet Group Management Protocol) is used in multicast environments to manage group membership and track multicast group members on a network.

Common Mistakes: Students may confuse IGMP with other protocols like ARP or ICMP, which are not related to multicast group management.

Explanations: IGMP is specifically designed to help routers manage multicast group membership. It allows routers to maintain a list of devices that are interested in receiving multicast traffic on each interface. This is crucial for efficient multicast traffic distribution, ensuring that data is only sent to devices that have expressed interest in receiving it.

Option Analysis:

Option A: Broadcast is not specific to multicast group management.
Option B: Unicast is not related to multicast group management.
Option C: Multicast is the correct context for IGMP, as it manages group membership for multicast traffic.
Option D: None of the above is incorrect because multicast is the correct context for IGMP.

304. For which one of the following reasons does Internet Protocol (IP) use the time-to-live (TTL) field in the IP datagram header

Correct Answer: Correct answer is: (C) Prevent packets from looping indefinitely.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The time-to-live (TTL) field in the IP datagram header is used to prevent packets from looping indefinitely in the network.

Common Mistakes: Students often confuse the TTL field with a timer that ensures packets reach their destination within a specific time frame.

Explanations: The TTL field is decremented by each router that forwards the packet. If the TTL reaches zero, the packet is discarded. This mechanism ensures that packets do not circulate indefinitely in the network, which could otherwise lead to congestion and inefficiency.

Option Analysis:

Option A: The TTL does not ensure packets reach the destination within a specific time; it is not a timer for delivery.
Option B: The TTL does not discard packets based on a specific time; it discards packets when the TTL value reaches zero.
Option C: The TTL prevents packets from looping indefinitely by decrementing the value with each router hop and discarding the packet when the TTL reaches zero.
Option D: The TTL does not limit the time a packet is queued in intermediate routers; it is a mechanism to prevent infinite looping.

305. MAC Address is used by which layer?

Correct Answer: Correct answer is: (B) Data Link Layer.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: The MAC (Media Access Control) address is a unique identifier assigned to network interfaces for communications at the data link layer of a network segment.

Common Mistakes: Students often confuse the MAC address with the IP address, which is used at the Network Layer.

Explanations: The MAC address is used by the Data Link Layer to uniquely identify devices on a local network. It is a hardware address that is burned into the network interface card (NIC) and is used for communication within the same network segment. The Data Link Layer is responsible for the reliable transfer of data between devices on the same network, and the MAC address plays a crucial role in this process.

Option Analysis:

Option A: The Transport Layer is responsible for end-to-end communication and does not use MAC addresses.
Option B: The Data Link Layer uses MAC addresses for device identification on a local network.
Option C: The Application Layer deals with user applications and does not use MAC addresses.
Option D: The Physical Layer deals with the transmission and reception of raw bit streams over a physical medium and does not use MAC addresses.

Mnemonic: MAC for Data Link, IP for Network.

306. What is autonegotiation?

Correct Answer: Correct answer is: (A) A procedure by which two connected devices choose common transmission parameters.

Exam Relevance: CCNA, Network+, CompTIA Network+

Difficulty: Easy

Concept notes: Autonegotiation is a process used in network communication to automatically configure the parameters for data transmission between two devices.

Common Mistakes: Students may confuse autonegotiation with other network protocols or algorithms, such as routing or security algorithms.

Explanations: Autonegotiation is a procedure that allows two connected devices to automatically determine and configure the best common transmission parameters, such as speed and duplex mode, to ensure optimal communication. This process is essential for ensuring compatibility and efficient data transfer between devices on a network.

Option Analysis:

Option A: Correct. Autonegotiation is indeed a procedure by which two connected devices choose common transmission parameters.
Option B: Incorrect. A security algorithm is a set of rules for securing data, not for configuring transmission parameters.
Option C: Incorrect. A routing algorithm is used to determine the best path for data to travel across a network, not for configuring transmission parameters.
Option D: Incorrect. This option is not applicable as the correct answer is provided in Option A.

307. VLANs create..... domains.

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

Exam Relevance: CCNA, CompTIA Network+, Cisco Certified Network Associate

Difficulty: Moderate

Concept notes: VLANs (Virtual Local Area Networks) are used to logically segment a network into multiple broadcast domains.

Common Mistakes: Students often confuse VLANs with creating unicast or multicast domains, but VLANs specifically isolate broadcast traffic.

Explanations: VLANs create broadcast domains by isolating broadcast traffic within each VLAN. This means that broadcast frames sent by a device in one VLAN are not forwarded to other VLANs, effectively creating separate broadcast domains for each VLAN.

Option Analysis:

Option A: Unicast traffic is not isolated by VLANs; it is forwarded based on MAC addresses.
Option B: Multicast traffic is not specifically isolated by VLANs; it is managed by multicast routing protocols.
Option C: VLANs create separate broadcast domains, isolating broadcast traffic within each VLAN.
Option D: This option is incorrect as VLANs do create broadcast domains.

Mnemonic: VLANs = Vastly Limiting All Network Broadcasts

308. LAN or WAN?A business has expanded into another country and needs its offices connected together.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: A WAN (Wide Area Network) connects networks over a large geographical area, such as different countries, making it suitable for connecting offices in different countries.

Common Mistakes: Students may confuse LAN (Local Area Network) with WAN, thinking that LAN can also connect offices in different countries.

Explanations: A WAN is designed to connect networks over large geographical distances, such as different countries. This makes it the appropriate choice for connecting offices in different countries. A LAN, on the other hand, is designed to connect devices within a limited geographical area, such as a single building or campus. Therefore, a WAN is the correct choice for the business's requirement to connect offices in another country.

Option Analysis:

Option A: LAN is not suitable for connecting offices in different countries as it is designed for local networks within a limited area.
Option B: WAN is the correct choice as it is designed to connect networks over large geographical distances, such as different countries.
Option C: Either (A) or (B) is incorrect because LAN is not suitable for connecting offices in different countries.
Option D: Neither (A) nor (B) is incorrect because WAN is the appropriate choice for connecting offices in different countries.

Mnemonic: WAN = Wide Area Network, connects far

309. A browser can retrieve and run an HTML file that has embedded address of

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

Exam Relevance: Web Development Exams, Computer Science Exams

Difficulty: Moderate

Concept notes: HTML files can embed applets, which are small programs that can be executed within a web page.

Common Mistakes: Students may confuse applets with other embedded content like images or scripts.

Explanations: HTML files can include embedded applets using the tag, which allows the browser to retrieve and run the applet code. This capability enables dynamic and interactive content within web pages.

Option Analysis:

Option A: Correct. HTML can embed applets using the tag.
Option B: Incorrect. Language is too broad and not specific to embedded content.
Option C: Incorrect. HTML is the language used to create the file, not an embedded address.
Option D: Incorrect. HTTP is a protocol for transferring files, not an embedded address within HTML.

Mnemonic: A for Applets, A for

310. Network that covers a broad area using telecommunication lines

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: WAN stands for Wide Area Network, which covers a broad area using telecommunication lines.

Common Mistakes: Students may confuse WAN with LAN (Local Area Network) or MAN (Metropolitan Area Network), which cover smaller geographical areas.

Explanations: WAN is the correct answer because it is designed to cover a broad area, often spanning cities, countries, or even continents. It uses telecommunication lines to connect various locations, making it suitable for large-scale network coverage.

Option Analysis:

Option A: LAN (Local Area Network) covers a small geographical area, such as a single building or campus, and is not suitable for broad area coverage.
Option B: MAN (Metropolitan Area Network) covers a larger area than LAN but is still limited to a city or metropolitan area, not broad enough for the question's context.
Option C: WAN (Wide Area Network) is designed to cover a broad area using telecommunication lines, making it the correct answer.
Option D: None of the above is incorrect because WAN is the appropriate network type for broad area coverage.

Mnemonic: WAN - Wide Area Network, "W" for "Worldwide"

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Computer networking MCQ - Set 31

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