Computer networking MCQ – Change your future

311. In DNS meaagaes a section consisting of one or more resource records is called

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: In DNS messages, the section containing one or more resource records is known as the Answer Section.

Common Mistakes: Students may confuse the Answer Section with the Question Section, which contains the query details.

Explanations: The Answer Section in a DNS message contains the resource records that directly answer the query. These records provide the requested information, such as IP addresses for domain names. The Question Section, on the other hand, contains the query details, not the resource records.

Option Analysis:

Option A: The Question Section contains the query details, not the resource records.
Option B: There is no Template Section in DNS messages.
Option C: The term "Resource Section" is not a standard DNS term.
Option D: The Answer Section contains the resource records that answer the query.

Mnemonic: A for Answer, A for Answer Section.

312. FCS field of Media Access Control frame contains CRC-32

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

Exam Relevance: Computer Networks, Data Communication, Network Security

Difficulty: Moderate

Concept notes: The FCS (Frame Check Sequence) field in a Media Access Control (MAC) frame is used to detect errors in the frame. It typically contains a CRC-32 (Cyclic Redundancy Check) value.

Common Mistakes: Students may confuse the FCS with error correction mechanisms, but the FCS is specifically for error detection, not correction.

Explanations: The FCS field in a MAC frame contains a CRC-32 value, which is a type of error detection code. This sequence is calculated over the entire frame and appended to the end. Upon reception, the receiver recalculates the CRC-32 and compares it with the received FCS. If they do not match, an error is detected. This mechanism ensures that the frame has not been corrupted during transmission, but it does not provide the capability to correct the errors.

Option Analysis:

Option A: The FCS does not provide error correction; it only detects errors.
Option B: The FCS contains a CRC-32 value, which is used for error detection.
Option C: The FCS is not related to flow control mechanisms.
Option D: The FCS is specifically for error detection, not general error control.

Mnemonic: CRC-32 detects, not corrects.

313. The ..... is the largest WAN in existence.

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Very Easy

Concept notes: The Internet is the largest Wide Area Network (WAN) in existence, connecting millions of smaller networks and devices worldwide.

Common Mistakes: Students may confuse the Internet with other large networks, such as TV networks, which are not WANs.

Explanations: The Internet is a global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide. It is the largest WAN, connecting millions of smaller networks and devices. TV networks, while extensive, do not qualify as WANs in the context of computer networking.

Option Analysis:

Option A: Correct. The Internet is the largest WAN.
Option B: Incorrect. TV networks are not WANs in the context of computer networking.
Option C: Incorrect. The Internet is the correct answer, not TV networks.
Option D: Incorrect. The Internet is the correct answer.

314. What does UTP stands for?

Correct Answer: Correct answer is: (A) Unshielded Twisted pair.

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

Difficulty: Very Easy

Concept notes: UTP stands for Unshielded Twisted Pair, which is a type of cable used in telecommunications and networking.

Common Mistakes: Students may confuse UTP with STP (Shielded Twisted Pair), which is a similar but different type of cable.

Explanations: UTP stands for Unshielded Twisted Pair. This type of cable is commonly used in Ethernet networks and consists of pairs of wires twisted together to reduce crosstalk and electromagnetic interference. The term "unshielded" indicates that the cable does not have an additional protective layer to shield it from external interference.

Option Analysis:

Option A: Correct. UTP stands for Unshielded Twisted Pair.
Option B: Incorrect. "Uniformly twisted pair" is not a standard term in networking or telecommunications.
Option C: Incorrect. "Unshielded Connecter pair" is not a standard term in networking or telecommunications.
Option D: Incorrect. This option suggests that none of the provided answers are correct, which is false.

315. In control field, first bit defines the

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

Exam Relevance: Computer Networks, Data Communication, Network Protocols

Difficulty: Easy

Concept notes: In control fields, the first bit typically defines the type of control message.

Common Mistakes: Students may confuse the first bit with sequence or acknowledgment numbers, which are different fields in the control field.

Explanations: The first bit in the control field is designated to identify the type of control message, such as whether it is a data frame, acknowledgment frame, or other control frames. This bit is crucial for determining the function and purpose of the frame in the communication process.

Option Analysis:

Option A: The first bit does not define the sequence number. Sequence numbers are typically found in other parts of the frame header.
Option B: The first bit does not define the acknowledgment number. Acknowledgment numbers are also located in different parts of the frame header.
Option C: The first bit defines the type of control message, which is correct.
Option D: The first bit does not define information. Information is typically carried in the data payload of the frame.

316. Computers use this to get connected to internet via telephone lines

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

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: A modem is a device that modulates and demodulates signals to enable data transmission over telephone lines.

Common Mistakes: Students may confuse a modem with a server or firewall, which have different functions in a network.

Explanations: A modem is used to connect a computer to the internet via telephone lines. It converts digital data from the computer into analog signals that can be transmitted over the telephone lines and vice versa. This function is essential for establishing an internet connection over telephone lines.

Option Analysis:

Option A: Correct. A modem is used to connect a computer to the internet via telephone lines.
Option B: Incorrect. A server is a computer system that provides services to other computers over a network, not for connecting to the internet via telephone lines.
Option C: Incorrect. A firewall is a security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules, not for connecting to the internet via telephone lines.
Option D: Incorrect. None of the above is not correct as a modem is the correct answer.

Mnemonic: Modem: Modulate, Demodulate, Connect

317. In forward transmission of Interim Standard 95 (IS-95), result of scrambler is combined using

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

Exam Relevance: Wireless Communications, Digital Communications, Telecommunications Engineering

Difficulty: Moderate

Concept notes: In IS-95, the scrambler output is combined with the encoded data using CDMA (Code Division Multiple Access) techniques.

Common Mistakes: Students may confuse CDMA with other multiple access techniques like TDMA or FSK, which are not used for combining the scrambler output in IS-95.

Explanations: In IS-95, the scrambler output is combined with the encoded data using CDMA techniques. CDMA is a spread-spectrum multiple access technique that allows multiple users to communicate over the same frequency band simultaneously. The scrambler output is used to spread the encoded data over a wider bandwidth, which is a key feature of CDMA. This spread spectrum technique helps in reducing interference and improving the overall system capacity.

Option Analysis:

Option A: FSK (Frequency Shift Keying) is a modulation technique, not a multiple access technique used for combining scrambler output in IS-95.
Option B: TDMA (Time Division Multiple Access) is a different multiple access technique that divides the available time into different time slots for different users, not used for combining scrambler output in IS-95.
Option C: CDMA (Code Division Multiple Access) is the correct technique used in IS-95 for combining the scrambler output with the encoded data.
Option D: CDMA and AMPS (Advanced Mobile Phone System) is incorrect because AMPS is an older analog cellular system and not used in IS-95 for combining scrambler output.

318. The..... is a true end to end layer protocol, from source to destination.

Correct Answer: Correct answer is: (D) Transport Layer.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The Transport Layer is responsible for end-to-end communication between applications on different hosts.

Common Mistakes: Students may confuse the Network Layer with the Transport Layer, as both are involved in data transmission.

Explanations: The Transport Layer is the only layer that provides end-to-end communication between applications on different hosts. It ensures that data is delivered reliably and in the correct order, handling segmentation, reassembly, and error checking. The Network Layer, Data Link Layer, and Data Layer do not provide this end-to-end service.

Option Analysis:

Option A: The Network Layer is responsible for routing data between different networks, but it does not provide end-to-end communication between applications.
Option B: The Data Link Layer is responsible for transmitting data between adjacent network nodes, but it does not provide end-to-end communication between applications.
Option C: The Data Layer is not a standard OSI layer and is not recognized in the OSI model.
Option D: The Transport Layer provides end-to-end communication between applications on different hosts, making it the correct answer.

319. Computer network topology in which user connects each network node to a central device hub is called

Correct Answer: Correct answer is: (C) Star topology.

Exam Relevance: CCNA, Network+ Certification, High School Computer Science Exams

Difficulty: Easy

Concept notes: In a star topology, all network nodes are connected to a central hub or switch.

Common Mistakes: Students may confuse star topology with bus topology, where nodes are connected to a single linear cable.

Explanations: In a star topology, each network node is directly connected to a central hub or switch. This central device acts as a mediator for all communications. This configuration ensures that a failure in one node does not affect the rest of the network, making it a reliable and commonly used topology.

Option Analysis:

Option A: Bus topology connects all nodes to a single linear cable, not a central hub.
Option B: Ring topology connects nodes in a circular configuration, not to a central hub.
Option C: Star topology connects each node to a central hub, which is the correct configuration described in the question.
Option D: Mesh topology connects each node to every other node, not to a central hub.

Mnemonic: Star = Central Hub

320. Header plus trailer of Ethernet is

Correct Answer: Correct answer is: (D) 18 Bytes.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Moderate

Concept notes: The Ethernet frame structure includes a header and trailer. The header consists of the destination MAC address (6 bytes), source MAC address (6 bytes), and the Type/Length field (2 bytes). The trailer includes the Frame Check Sequence (FCS) which is 4 bytes long.

Common Mistakes: Students often confuse the total size of the header and trailer with just the header size, which is 14 bytes.

Explanations: The Ethernet frame structure includes a header and trailer. The header is composed of the destination MAC address (6 bytes), source MAC address (6 bytes), and the Type/Length field (2 bytes), totaling 14 bytes. The trailer includes the Frame Check Sequence (FCS) which is 4 bytes long. Therefore, the total size of the header plus trailer is 14 bytes (header) + 4 bytes (trailer) = 18 bytes.

Option Analysis:

Option A: 12 Bytes is incorrect because it does not account for the full header and trailer sizes.
Option B: 14 Bytes is incorrect because it only accounts for the header size and not the trailer.
Option C: 16 Bytes is incorrect because it does not accurately reflect the total size of the header and trailer.
Option D: 18 Bytes is correct because it includes both the header (14 bytes) and the trailer (4 bytes).

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Computer networking MCQ - Set 32

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