Computer networking MCQ – Change your future

141. In Audio and Video Compression, term RBG expresses

Correct Answer: Correct answer is: (A) Red, Blue, Green.

Exam Relevance: Computer Science, Electrical Engineering, Multimedia Systems

Difficulty: Very Easy

Concept notes: RBG stands for Red, Blue, Green, which are the primary colors used in additive color mixing, particularly in digital displays and video systems.

Common Mistakes: Students may confuse RBG with RGB (Red, Green, Blue), which is the correct acronym for the primary colors used in digital displays.

Explanations: RBG is a common typo for RGB, which represents the primary colors used in additive color mixing. In digital displays and video systems, the colors red, blue, and green are combined in various intensities to produce a wide range of colors. The correct acronym is RGB, but the question specifically asks for RBG, which is a typographical error.

Option Analysis:

Option A: Correct. RBG is a typo for RGB, which stands for Red, Blue, Green.
Option B: Incorrect. Red, Black, Grey are not the primary colors used in additive color mixing.
Option C: Incorrect. Rate, Bit, Giga bit are unrelated to color representation in digital displays.
Option D: Incorrect. Red, Bluish, Greyish are not standard terms used in color representation.

142. What ISP stands for:

Correct Answer: Correct answer is: (C) Internet Service Provider.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Very Easy

Concept notes: ISP stands for Internet Service Provider, which is a company that provides individuals and businesses access to the internet.

Common Mistakes: Students may confuse ISP with other acronyms that start with "I" and relate to technology or security.

Explanations: ISP is the correct acronym for Internet Service Provider. This term refers to a company that offers internet access to customers, enabling them to connect to the internet and access online services.

Option Analysis:

Option A: Identyfication System Provisioning is not a standard term and does not relate to internet services.
Option B: Internal Security Path is not a standard term and does not relate to internet services.
Option C: Internet Service Provider is the correct term for a company that provides internet access.
Option D: Independent Secret Police is not related to internet services and is not a standard term.

143. Which of these describes an IPv4 address?

Correct Answer: Correct answer is: (B) Four sets of numbers between 0 and 255, separated with a full stop.

Exam Relevance: CCNA, CompTIA Network+, A+ Certification

Difficulty: Easy

Concept notes: An IPv4 address is a 32-bit number represented in dotted-decimal notation.

Common Mistakes: Students may confuse IPv4 with IPv6, which uses hexadecimal numbers and colons.

Explanations: An IPv4 address consists of four octets, each a decimal number ranging from 0 to 255. These octets are separated by periods (full stops). This format is known as dotted-decimal notation.

Option Analysis:

Option A: This describes an IPv6 address, not an IPv4 address.
Option B: This correctly describes an IPv4 address.
Option C: This does not match the format of an IPv4 address.
Option D: This does not match the format of an IPv4 address.

144. UTP cables are

Correct Answer: Correct answer is: (B) Unshielded Cables.

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

Difficulty: Easy

Concept notes: UTP stands for Unshielded Twisted Pair, which indicates that these cables do not have any shielding.

Common Mistakes: Students may confuse UTP with STP (Shielded Twisted Pair) cables, which do have shielding.

Explanations: UTP cables are unshielded, meaning they do not have any protective shielding around the twisted pairs of wires. This makes them distinct from shielded cables, which do have a protective layer to reduce electromagnetic interference.

Option Analysis:

Option A: Incorrect, as UTP cables are not shielded.
Option B: Correct, as UTP cables are unshielded.
Option C: Incorrect, as UTP cables are not fiber optics cables.
Option D: Incorrect, as UTP cables are specifically unshielded cables.

145. The..... layer is responsible for the source-to-destination delivery of a packet across multiple network links.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The Network layer is responsible for the source-to-destination delivery of a packet across multiple network links.

Common Mistakes: Students often confuse the Network layer with the Transport layer, which is responsible for end-to-end communication between applications.

Explanations: The Network layer is responsible for the source-to-destination delivery of a packet across multiple network links. This layer handles routing and forwarding of packets through different networks, ensuring that data reaches its intended destination. The Transport layer, on the other hand, is responsible for end-to-end communication between applications, ensuring reliable data transfer.

Option Analysis:

Option A: The Transport layer is responsible for end-to-end communication between applications, not for routing packets across multiple network links.
Option B: The Network layer is responsible for the source-to-destination delivery of a packet across multiple network links, making it the correct answer.
Option C: The Data link layer is responsible for the transfer of data between adjacent network nodes in a wide area network (WAN) or between nodes on the same local area network (LAN), not for routing across multiple network links.
Option D: The Physical layer is responsible for the transmission and reception of unstructured raw data between a device and a physical transmission medium, not for routing packets across multiple network links.

146. Which one of the following is an SMTP server configured in such a way that anyone on the internet can send e-mail through it?

Correct Answer: Correct answer is: (A) Open mail relay.

Exam Relevance: CISSP, CompTIA Security+, Network+

Difficulty: Easy

Concept notes: An open mail relay is an SMTP server that allows anyone on the internet to send email through it, without requiring authentication or other restrictions.

Common Mistakes: Students may confuse open mail relay with open mail reception, which is not a standard term and does not describe the same concept.

Explanations: An open mail relay is an SMTP server that allows anyone on the internet to send email through it without any restrictions. This makes it a potential tool for spammers and malicious actors to send unsolicited emails. The term "open mail relay" specifically refers to this configuration, making it the correct answer.

Option Analysis:

Option A: Correct. An open mail relay is an SMTP server that allows anyone on the internet to send email through it without restrictions.
Option B: Incorrect. "Wide mail reception" is not a standard term in SMTP server configurations.
Option C: Incorrect. "Open mail reception" is not a standard term and does not describe the same concept as an open mail relay.
Option D: Incorrect. The correct answer is provided in option A.

147. A domain name "hello.customer.info." Is

Correct Answer: Correct answer is: (B) Generic domain.

Exam Relevance: ICANN certification, CompTIA Network+, CCNA

Difficulty: Easy

Concept notes: The domain name "hello.customer.info." is classified as a generic domain because it uses a generic top-level domain (gTLD) such as ".info".

Common Mistakes: Students may confuse the term "generic domain" with "generic top-level domain" and overlook the structure of the domain name.

Explanations: The domain name "hello.customer.info." is a generic domain because it uses ".info" as the top-level domain, which is a generic top-level domain. The structure of the domain name does not indicate a city, country, or sub-domain classification.

Option Analysis:

Option A: Incorrect because "hello.customer.info." does not indicate a city domain.
Option B: Correct because ".info" is a generic top-level domain.
Option C: Incorrect because "hello.customer.info." does not indicate a country domain.
Option D: Incorrect because "hello.customer.info." is not a sub-domain but a full domain name.

148. Fiber optics posses following properties

Correct Answer: Correct answer is: (D) All of the mentioned.

Exam Relevance: GATE, ECE, EE

Difficulty: Moderate

Concept notes: Fiber optics are known for their unique properties that make them highly effective in telecommunications and data transmission.

Common Mistakes: Students may overlook the comprehensive nature of fiber optics properties and incorrectly assume only one or two properties are correct.

Explanations: Fiber optics are immune to electromagnetic interference because light signals are not affected by external electromagnetic fields. They exhibit very low signal attenuation, meaning the signal strength diminishes minimally over long distances. Additionally, fiber optics are very hard to tap into without disrupting the signal, making them secure for data transmission. Therefore, all the mentioned properties are correct.

Option Analysis:

Option A: Fiber optics are immune to electromagnetic interference, which is a key property.
Option B: Fiber optics have very low signal attenuation, which is another important property.
Option C: Fiber optics are very hard to tap, enhancing their security.
Option D: All of the mentioned properties are correct, making this the comprehensive answer.

149. Which networking device would be needed to connect to a WAN?

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

Exam Relevance: CCNA, Network+, CIW

Difficulty: Easy

Concept notes: A router is necessary to connect to a Wide Area Network (WAN) because it can route data packets between different networks.

Common Mistakes: Students may confuse a switch with a router, as both are networking devices. However, a switch operates at the data link layer and is used for local network communication, while a router operates at the network layer and is used for connecting different networks.

Explanations: A router is the correct choice because it is designed to connect different networks, including a local network to a WAN. It uses routing protocols to determine the best path for data to travel between networks, making it essential for WAN connectivity.

Option Analysis:

Option A: A router is the correct choice for connecting to a WAN as it can route data between different networks.
Option B: A switch is used for connecting devices within a local network and does not have the capability to connect to a WAN.
Option C: A server is a computer system that provides services to other computers on a network but does not have the capability to connect to a WAN.
Option D: A hub is a simple networking device that broadcasts data to all connected devices and does not have the capability to connect to a WAN.

Mnemonic: Routers Route, Switches Switch, Servers Serve, Hubs Hub.

150. What is the basic purpose of a repeater in a network?

Correct Answer: Correct answer is: (A) To regenerate a signal to improve its strength over transmission distances.

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

Difficulty: Easy

Concept notes: A repeater is a device used in networking to amplify or regenerate a signal to extend its transmission distance.

Common Mistakes: Students may confuse a repeater with a switch or router, which perform different functions in a network.

Explanations: A repeater is used to regenerate a signal to improve its strength over transmission distances. This is because signals can weaken as they travel over long distances, leading to potential data loss or corruption. By regenerating the signal, a repeater ensures that the data can be transmitted reliably over longer distances without degradation.

Option Analysis:

Option A: Correct. A repeater regenerates a signal to improve its strength over transmission distances.
Option B: Incorrect. Joining multiple computers together within the same local area network (LAN) is the function of a switch or hub, not a repeater.
Option C: Incorrect. Transmitting both data and power along a single cable is the function of Power over Ethernet (PoE), not a repeater.
Option D: Incorrect. Inspecting and forwarding data traffic using layer 3 of the OSI model is the function of a router, not a repeater.

Mnemonic: R for Repeater, R for Regenerate.

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Computer networking MCQ - Set 15

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