Computer networking MCQ

1141. In 10Base5, maximum length of coaxial cable is

Correct Answer: Correct answer is: (C) 500 meter.

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Moderate

Concept notes: 10Base5 is a type of Ethernet technology that uses thick coaxial cable. The "5" in 10Base5 refers to the maximum cable length of 500 meters.

Common Mistakes: Students may confuse 10Base5 with other Ethernet standards, such as 10Base2, which has a maximum cable length of 185 meters.

Explanations: 10Base5 specifies the use of thick coaxial cable (RG-8) with a maximum segment length of 500 meters. This standard is designed to support a 10 Mbps data rate over a baseband transmission. The "5" in 10Base5 directly indicates the maximum cable length, making 500 meters the correct answer.

Option Analysis:

Option A: 10 meters is incorrect as it is far too short for 10Base5.
Option B: 250 meters is incorrect as it is less than the maximum length specified by 10Base5.
Option C: 500 meters is the correct maximum length for 10Base5.
Option D: 5000 meters is incorrect as it exceeds the maximum length specified by 10Base5.

1142. A distributed database that links computer names and their IP addresses

Correct Answer: Correct answer is: (A) DNS (Domain Name Service).

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: DNS (Domain Name Service) is a distributed database system that translates human-readable domain names into IP addresses.

Common Mistakes: Students may confuse DNS with other network components like ISPs or MAC addresses, which do not perform the function of translating domain names to IP addresses.

Explanations: DNS is the correct answer because it is specifically designed to link computer names (domain names) with their corresponding IP addresses. This service is essential for the functioning of the internet, as it allows users to access websites using domain names rather than IP addresses.

Option Analysis:

Option A: Correct. DNS is the distributed database that links computer names and their IP addresses.
Option B: Incorrect. An ISP (Internet Service Provider) provides internet access but does not link computer names to IP addresses.
Option C: Incorrect. A MAC address is a unique identifier for a network interface but does not link computer names to IP addresses.
Option D: Incorrect. Modem numbers are related to the hardware used to connect to the internet but do not link computer names to IP addresses.

Mnemonic: DNS: Domain Names to IP Numbers System

1143. In STS, multiplexing can also take place at higher

Correct Answer: Correct answer is: (A) Data Rates.

Exam Relevance: Networking Exams, Telecommunications Exams, Data Communication Exams

Difficulty: Moderate

Concept notes: In Synchronous Transport Signal (STS), multiplexing can occur at higher data rates to combine multiple lower-rate signals into a single higher-rate signal.

Common Mistakes: Students may confuse the concept of multiplexing with other signal processing techniques, such as framing or clocking, which are not directly related to the data rate.

Explanations: Multiplexing in STS involves combining multiple lower-rate signals into a single higher-rate signal. This process can take place at higher data rates, allowing for efficient transmission of multiple data streams over a single channel. The other options (Frame Rates, Clock Rates, and SONET Rates) are not directly related to the process of multiplexing in the context of STS.

Option Analysis:

Option A: Data Rates is the correct answer as multiplexing in STS can occur at higher data rates.
Option B: Frame Rates are not directly related to the multiplexing process in STS.
Option C: Clock Rates are not directly related to the multiplexing process in STS.
Option D: SONET Rates are specific to SONET standards and not directly related to the multiplexing process in STS.

1144. To transmit digital signals over the telephone lines which transmit analog signals, a device is used known as

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

Exam Relevance: GATE, GRE, CCNA

Difficulty: Easy

Concept notes: A modem is a device that converts digital signals into analog signals and vice versa, enabling digital data to be transmitted over analog communication lines such as telephone lines.

Common Mistakes: Students may confuse a modem with a converter, which is a more general term and does not specifically refer to the conversion between digital and analog signals.

Explanations: A modem is specifically designed to convert digital signals into analog signals for transmission over telephone lines, and then convert the analog signals back into digital signals at the receiving end. This makes it the correct device for transmitting digital signals over analog telephone lines.

Option Analysis:

Option A: Correct. A modem is the device that converts digital signals to analog and vice versa, making it suitable for transmitting digital data over analog telephone lines.
Option B: Incorrect. A converter is a general term and does not specifically refer to the conversion between digital and analog signals.
Option C: Incorrect. A router is used to direct data traffic between different networks and does not perform the conversion between digital and analog signals.
Option D: Incorrect. A transmitter is a device that sends signals but does not necessarily perform the conversion between digital and analog signals.

1145. Which of the following network types have a designated router and a backup designated router assigned? 1. Broadcast 2. Point-to-point 3. NBMA 4. NBMA point-to-point

Correct Answer: Correct answer is: (B) 1 and 3.

Exam Relevance: CCNA, CCNP, Network+

Difficulty: Moderate

Concept notes: In OSPF (Open Shortest Path First), designated routers (DR) and backup designated routers (BDR) are assigned in certain network types to reduce the number of adjacencies and to facilitate efficient flooding of link-state updates.

Common Mistakes: Students often confuse the network types that require a DR and BDR. They may incorrectly assume that all network types require these roles.

Explanations: Broadcast networks (1) and NBMA (3) require a designated router (DR) and a backup designated router (BDR) to manage the flooding of link-state updates. Point-to-point networks (2) and NBMA point-to-point (4) do not require a DR or BDR because they have a simpler adjacency structure.

Option Analysis:

Option A: Incorrect because point-to-point networks do not require a DR or BDR.
Option B: Correct because broadcast and NBMA networks require a DR and BDR.
Option C: Incorrect because NBMA point-to-point networks do not require a DR or BDR.
Option D: Incorrect because not all network types require a DR or BDR.

Mnemonic: DR-Broadcast-NBMA

1146. A.....is a network that connects an area larger than a LAN such as a city or an area upto 100 sq km.

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

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Easy

Concept notes: A Metropolitan Area Network (MAN) is a network that connects computers and other devices within a city or a large campus, typically covering an area up to 100 square kilometers.

Common Mistakes: Students may confuse MAN with WAN, as both cover larger areas than LANs, but WANs cover much larger geographical areas, often spanning countries or continents.

Explanations: A MAN is designed to connect multiple LANs within a city or a large campus. It is larger than a LAN but smaller than a WAN. The correct answer is MAN because it fits the description of a network that connects an area larger than a LAN but not as large as a WAN.

Option Analysis:

Option A: Correct. MAN is the correct term for a network that connects an area larger than a LAN but not as large as a WAN.
Option B: Incorrect. WAN (Wide Area Network) covers much larger geographical areas, often spanning countries or continents.
Option C: Incorrect. PAN (Personal Area Network) is a network for interconnecting devices centered around an individual's workspace and typically covers a very small area, such as within a few meters.
Option D: Incorrect. This option is not applicable as MAN is the correct answer.

Mnemonic: MAN: Metropolitan Area Network, think "Metropolis" for a city-sized network.

1147. What is the main function of DSLAM?

Correct Answer: Correct answer is: (A) Convert analog signal into digital signal.

Exam Relevance: CCNA, CompTIA Network+, IEEE exams

Difficulty: Moderate

Concept notes: DSLAM (Digital Subscriber Line Access Multiplexer) is a device used in telecommunications networks to convert analog signals from the subscriber's line into digital signals for transmission over a digital network.

Common Mistakes: Students often confuse the function of DSLAM with that of a modem, which also converts signals but typically operates at a different level in the network hierarchy.

Explanations: DSLAM is used in the local exchange to convert the analog signals received from the subscriber's line into digital signals. This conversion is necessary because the backbone of the telecommunications network operates on digital signals. The DSLAM aggregates multiple subscriber lines and multiplexes them onto a high-speed digital line for transmission to the Internet or other digital networks.

Option Analysis:

Option A: Correct. DSLAM converts analog signals from the subscriber's line into digital signals.
Option B: Incorrect. This is the function of a modem, not DSLAM.
Option C: Incorrect. This is a function related to network management and not specific to DSLAM.
Option D: Incorrect. The correct function is described in Option A.

1148. In 8B6T, each signal pattern has a weight of 0 or

Correct Answer: Correct answer is: (A) 1.

Exam Relevance: Telecommunications Engineering, Digital Communications, Information Theory

Difficulty: Moderate

Concept notes: In 8B6T encoding, each signal pattern is designed to have a weight of either 0 or 1. This ensures that the signal patterns maintain a balanced transmission, which is crucial for minimizing interference and ensuring reliable data transmission.

Common Mistakes: Students often confuse the weight of the signal patterns with the actual binary values being transmitted, leading to incorrect assumptions about the weight.

Explanations: 8B6T encoding is a line coding scheme used in telecommunications to encode 8 bits of data into 6 signal elements. Each signal pattern in 8B6T is designed to have a weight of either 0 or 1. This weight is not the same as the binary value of the data but rather a characteristic of the signal pattern itself. The weight of 0 or 1 ensures that the signal patterns are balanced, which helps in reducing the overall DC component and minimizing interference. Therefore, the correct weight for each signal pattern in 8B6T is 1.

Option Analysis:

Option A: Correct. The weight of each signal pattern in 8B6T is 0 or 1.
Option B: Incorrect. The weight is not -1.
Option C: Incorrect. The weight is not -2.
Option D: Incorrect. The weight is not infinity.

1149. In Token Ring, Which of the following is not a transceiver function?

Correct Answer: Correct answer is: (C) Addition and subtraction of header.

Exam Relevance: CCNA, Network+, CompTIA Network+

Difficulty: Moderate

Concept notes: In Token Ring networks, transceivers are responsible for the physical transmission and receipt of data, checking line voltages, and handling collisions. However, the addition and subtraction of headers are typically handled by the network interface card (NIC) or the network protocol stack, not the transceiver.

Common Mistakes: Students may mistakenly believe that transceivers handle all aspects of data transmission, including header manipulation, due to the transceiver's role in the physical layer of the network.

Explanations: Transceivers in Token Ring networks are primarily responsible for the physical layer functions such as transmission and receipt of data, checking line voltages, and managing collisions. The addition and subtraction of headers are higher-level functions that are typically managed by the network interface card (NIC) or the network protocol stack. Therefore, the function of adding and subtracting headers is not a responsibility of the transceiver.

Option Analysis:

Option A: Transmission and receipt of data are core functions of a transceiver in Token Ring networks.
Option B: Checking line voltages is another function performed by the transceiver to ensure proper signal integrity.
Option C: Addition and subtraction of headers are not transceiver functions but are handled by higher-level network components.
Option D: Collision detection and management are part of the transceiver's responsibilities in Token Ring networks.

1150. TCP/IP model was developed ..... the OSI model.

Correct Answer: Correct answer is: (A) Prior to.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: The TCP/IP model was developed before the OSI model.

Common Mistakes: Students often confuse the chronological order of the development of the TCP/IP and OSI models.

Explanations: The TCP/IP model was developed in the late 1960s and early 1970s, primarily by Vint Cerf and Bob Kahn. The OSI model, on the other hand, was developed in the late 1970s and early 1980s by the International Organization for Standardization (ISO). Therefore, the TCP/IP model predates the OSI model.

Option Analysis:

Option A: Correct. The TCP/IP model was developed prior to the OSI model.
Option B: Incorrect. The OSI model was developed after the TCP/IP model.
Option C: Incorrect. The TCP/IP and OSI models were not developed simultaneously.
Option D: Incorrect. The TCP/IP model and OSI model are related in terms of their development timeline.

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Computer networking MCQ - Set 115

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