Data Over Cable Service Interface Specification Quiz

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  • 1/90 Questions

    If a 10 dB step attenuator is installed to reduce the amount of ingress/noise that originates in the customer premises what would be the expected improvement in carrier-to-noise C/N? 

    • 5 dB.
    • No change.
    • 10 dB.
    • 15 dB.
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About This Quiz

Data Over Cable Service Interface Specification – or simply DOCSIS – is an international telecommunications standard which permits the addition of high-bandwidth data transfer to an existing cable TV system. What can you tell us about the topic? Let’s find out.

Data Over Cable Service Interface Specification Quiz - Quiz

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  • 2. 

    Which of the following devices have diagnostic pages which can be used to confirm and verify operation of the return path? 

    • Most cable modems, test generators, and set-top boxes (STB) have diagnostic pages.

    • Most leakage detectors, cable emulators, and return path testers have diagnostic pages.

    • Most cable modems, embedded multimedia terminal adapters (EMTA), and set-top boxes (STB) have diagnostic pages.

    • Most leakage detectors, cable emulators, and test generators have diagnostic pages.

    Correct Answer
    A. Most cable modems, embedded multimedia terminal adapters (EMTA), and set-top boxes (STB) have diagnostic pages.
    Explanation
    The correct answer is that most cable modems, embedded multimedia terminal adapters (EMTA), and set-top boxes (STB) have diagnostic pages. This means that these devices can be used to confirm and verify the operation of the return path.

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  • 3. 

    The most common source of ingress and egress is located at which of the following points in the broadband cable network? 

    • At the coax interface on the node.

    • At the distribution amplifier.

    • The customer premises and the drop cable.

    • At the headend.

    Correct Answer
    A. The customer premises and the drop cable.
    Explanation
    The customer premises and the drop cable are the most common points of ingress and egress in the broadband cable network. This is because the customer premises is where the cable service is accessed and the drop cable is the physical connection between the network and the customer's location.

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  • 4. 

    The first version of the Data Over Cable Service Interface Specification (DOCSIS) was approved as an international standard by what organization? 

    • The Institute of Electrical and Electronics Engineers (IEEE).

    • The Society of Cable Telecommunications Engineers (SCTE).

    • The International Organization for Standardization (ISO).

    • The International Telecommunication Union (ITU).

    Correct Answer
    A. The International Telecommunication Union (ITU).
    Explanation
    The correct answer is The International Telecommunication Union (ITU). The ITU is a specialized agency of the United Nations that is responsible for coordinating and standardizing telecommunications and information and communication technologies (ICTs) worldwide. It plays a crucial role in developing and approving international standards for various technologies, including data over cable service interface specification (DOCSIS). Therefore, it makes sense that the first version of DOCSIS was approved as an international standard by the ITU.

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  • 5. 

    In a client/server relationship there are two types of client categories: thin clients and thick clients. What is the difference between the two client categories? 

    • Thin clients are not capable of running applications independent of the server. Thick clients are capable of downloading and running installed applications independent of a server.

    • Thin clients are small portable devices such as laptop computers and smart phones. Thick clients are stationary devices such as desktop and mainframe computers.

    • Thin clients will only work with one dedicated server. Thick clients will work with multiple servers simultaneously.

    • Thin clients are used for home applications such as game consoles or to download movies. Thick clients are used for business applications in computers.

    Correct Answer
    A. Thin clients are not capable of running applications independent of the server. Thick clients are capable of downloading and running installed applications independent of a server.
    Explanation
    Thin clients are client devices that rely on a server to perform most of their processing tasks. They are not capable of running applications independently and require a constant connection to the server to function. On the other hand, thick clients are capable of downloading and running installed applications independently of a server. They have their own processing power and can perform tasks without relying heavily on the server. Thick clients are often used in business settings where more processing power and independence are required.

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  • 6. 

    Where is a logical place to begin troubleshooting a high-speed data (HSD) problem in the customer premises? 

    • The ground block.

    • The network interface card (NIC) in the customer's computer.

    • The cable modem.

    • The customer's wireless router.

    Correct Answer
    A. The cable modem.
    Explanation
    The cable modem is a logical place to begin troubleshooting a high-speed data (HSD) problem in the customer premises because it is responsible for establishing the connection between the customer's computer and the internet service provider. If there is an issue with the cable modem, such as a faulty connection or a configuration problem, it can result in a loss of internet connectivity. Therefore, checking the cable modem would be the first step in identifying and resolving the HSD problem.

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  • 7. 

    The converged data/voice network 

    • Solutions need not accommodate features such as automatic attendant capability, teleconferencing, or caller ID.

    • Fulfills all but the most fundamental aspect of network management of integrating the transport of information cost-effectively.

    • Uses a variety of hardware and software products for voice digitization and compression that enable voice to be transported on public and private networks originally developed to transport data.

    • Is required to treat different data types exactly alike and must have high delay for voice telephony, megabit data streams for video, and high error rates for mission-critical data.

    Correct Answer
    A. Uses a variety of hardware and software products for voice digitization and compression that enable voice to be transported on public and private networks originally developed to transport data.
    Explanation
    The converged data/voice network uses a variety of hardware and software products for voice digitization and compression. This allows voice to be transported on public and private networks that were originally developed to transport data. This explanation highlights the key aspect of the correct answer, which is the use of voice digitization and compression technology to enable voice transmission on data networks.

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  • 8. 

    During which part of provisioning is the Data Over Cable Service Interface Specification (DOCSIS) modem authorized for high-speed data service?

    • Ranging and automatic adjustment.

    • Characterizing.

    • Registration

    • Synchronization of data.

    Correct Answer
    A. Registration
    Explanation
    The DOCSIS modem is authorized for high-speed data service during the registration process. This is when the modem establishes communication with the cable provider's network and provides necessary information such as its unique identifier and capabilities. Registration ensures that the modem is authorized to access the high-speed data service and enables the provider to manage and monitor the modem's usage.

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  • 9. 

    Why is it a good practice to reboot the customer's computer after you have successfully accessed an Internet site? 

    • Rebooting the computer ensures that the modem provisioning software installed on the computer remains in place.

    • Rebooting the computer confirms that any changed settings are stored in the computer's memory and that the computer and modem continue to operate together after rebooting.

    • Rebooting the computer prevents the unintentional downloading of modem-specific features into the customer's computer.

    • Rebooting the computer ensures that the modem installation client is installed in the customer's computer.

    Correct Answer
    A. Rebooting the computer confirms that any changed settings are stored in the computer's memory and that the computer and modem continue to operate together after rebooting.
    Explanation
    Rebooting the customer's computer after successfully accessing an Internet site is a good practice because it ensures that any changes made to the computer's settings are stored in its memory. This helps to maintain the proper functioning of the computer and modem as they continue to operate together after the reboot.

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  • 10. 

    Which of the following describes the methods used to determine if a set-top box (STB) is non-responsive? 

    • STBs are always in communications with the headend. A non-responsive STB generates an e-mail alert.

    • STBs send a status message to the cable modem to let it know when it loses contact with the headend.

    • STBs are polled to see if they respond and a report is created. Non-responsive STBs can result in a significant loss of revenue.

    • STBs are polled by the EMTA periodically to see if they respond. Non-responsive SIGs are replaced.

    Correct Answer
    A. STBs are polled to see if they respond and a report is created. Non-responsive STBs can result in a significant loss of revenue.
    Explanation
    STBs are polled to see if they respond and a report is created. This method is used to determine if a set-top box (STB) is non-responsive. Non-responsive STBs can result in a significant loss of revenue, so it is important to monitor their responsiveness. By polling the STBs and creating a report, it allows for easy identification of any non-responsive STBs, allowing for prompt action to be taken to address the issue and minimize revenue loss.

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  • 11. 

    When aligning the return amplifiers, which method will deliver the most accurate alignment results? 

    • A forward sweep from 54-860 MHz will deliver the most accurate alignment results.

    • A return sweep from 5-42 MHz will deliver the most accurate alignment results.

    • Injecting RF frequencies from 5-108 MHz at 6 MHz intervals will deliver the most accurate alignment results.

    • Injecting RF frequencies from 5-42 MHz at 6 MHz intervals will deliver the most accurate alignment results.

    Correct Answer
    A. A return sweep from 5-42 MHz will deliver the most accurate alignment results.
    Explanation
    A return sweep from 5-42 MHz will deliver the most accurate alignment results because it covers a narrower frequency range compared to the other options. This allows for a more focused and precise alignment process, ensuring that the return amplifiers are properly calibrated within this specific frequency range. The narrower range also reduces the potential for interference or signal distortion that may occur when aligning over a wider frequency range.

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  • 12. 

    What are some possible causes of signal reflections? 

    • Overloaded input levels to a house amplifier that are reflected back to their source.

    • The use of splitters instead of directional couplers in the drop system.

    • Unpowered house amplifiers that reflect signals back to their source.

    • Loose or bad connections at the tap or unterminated splitter ports in the drop system.

    Correct Answer
    A. Loose or bad connections at the tap or unterminated splitter ports in the drop system.
    Explanation
    Possible causes of signal reflections include loose or bad connections at the tap or unterminated splitter ports in the drop system. When there are loose or bad connections, the signal can bounce back instead of being properly transmitted, leading to signal reflections.

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  • 13. 

    Which of the following describes the primary source of attenuation in the return path? 

    • Attenuation in the return path is primarily due to fiber-optic cable.

    • Attenuation in the return path is primarily due to the coaxial cable.

    • Attenuation in the return path is primarily due to the passive devices.

    • Attenuation in the return path is primarily due to the active devices.

    Correct Answer
    A. Attenuation in the return path is primarily due to the passive devices.
    Explanation
    Question #31: Multiple Choice - choose 1 answer (page 4.7)
    Which of the following describes the primary source of attenuation in the return path?
    A) Attenuation in the return path is primarily due to fiber-optic cable.
    B) Attenuation in the return path is primarily due to the coaxial cable.
    C) Attenuation in the return path is primarily due to the passive devices.
    D) Attenuation in the return path is primarily due to the active devices.

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  • 14. 

    What would be the downstream throughput if two 256-QAM channels with a throughput of 38 megabits per second (Mbps) were bonded? 

    • 38 Mbps.

    • 152 Mbps.

    • 108 Mbps.

    • 76 Mbps.

    Correct Answer
    A. 76 Mbps.
    Explanation
    When two 256-QAM channels are bonded, their throughputs do not simply add up. Instead, the throughput is limited by the channel with the lower throughput. In this case, both channels have a throughput of 38 Mbps, so the maximum downstream throughput when they are bonded would also be 38 Mbps. Therefore, the correct answer is 38 Mbps, not 76 Mbps.

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  • 15. 

    Where in the outside plant return path is one of the largest funnel points of RF return signals in the network? 

    • At the directional coupler of the drop farthest away from the node.

    • At the return amplifier farthest away from the node.

    • At the node.

    • At the tap farthest away from the node.

    Correct Answer
    A. At the node.
    Explanation
    At the node is the correct answer because the node is the central point where the RF return signals from all the drop cables converge. This convergence creates a funnel effect, making the node one of the largest funnel points for RF return signals in the network.

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  • 16. 

    Which of the following describes thermal noise? 

    • Thermal noise is always present in a transmission path and is created by the temperature fluctuations of the laser in an optical node.

    • Thermal noise is microwave ingress in a transmission path and is caused by local public safety radio transmissions.

    • Thermal noise is intermittent in a transmission path and is caused by the occasional electrical switching device like a motor or transformer.

    • Thermal noise is caused by fluctuations in electron density within amplifier circuitry. As the signal passes through an amplifier, thermal noise is generated and added to the amplified signal.

    Correct Answer
    A. Thermal noise is caused by fluctuations in electron density within amplifier circuitry. As the signal passes through an amplifier, thermal noise is generated and added to the amplified signal.
    Explanation
    Thermal noise is caused by fluctuations in electron density within amplifier circuitry. As the signal passes through an amplifier, thermal noise is generated and added to the amplified signal. This means that the noise is inherent to the system and is not caused by external factors such as temperature fluctuations or radio transmissions.

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  • 17. 

    Which of the following is one mode of wireless access? 

    • Analog CDMA technology.

    • Analog TDMA technology.

    • Digital CDMA technology.

    • Digital FDMA technology.

    Correct Answer
    A. Digital CDMA technology.
    Explanation
    Digital CDMA technology is one mode of wireless access. CDMA stands for Code Division Multiple Access, which is a digital cellular technology that allows multiple users to share the same frequency band simultaneously. It uses spread spectrum techniques to divide the available bandwidth into multiple channels. This enables more efficient use of the spectrum and allows for increased capacity and improved call quality. Analog CDMA and TDMA technologies are outdated and have been replaced by digital technologies. Digital FDMA technology, on the other hand, does not use code division and is not a mode of wireless access.

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  • 18. 

    Wireless applications 

    • And equipment include cellular phones, pagers, cordless phones, cordless laptops, palmtops, computer peripheral devices, home entertainment control systems, and other products.

    • Require a minimum bit rate of 10 kbps to satisfy intersystem matching between wireless and wired LANs.

    • Using wireless local area network technology can offer substantially higher data rates by increasing the size of the coverage area.

    • Using cordless and wireless local area network (WLAN) technology have higher mobility and higher cost than cellular systems.

    Correct Answer
    A. And equipment include cellular phones, pagers, cordless phones, cordless laptops, palmtops, computer peripheral devices, home entertainment control systems, and other products.
    Explanation
    The given answer correctly identifies the various wireless applications and equipment such as cellular phones, pagers, cordless phones, cordless laptops, palmtops, computer peripheral devices, home entertainment control systems, and other products. It accurately lists the different devices that fall under the category of wireless applications and equipment.

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  • 19. 

    When a Data Over Cable Service Interface Specification (DOCSIS) modem is powered up and connected to the cable system it will automatically begin the initialization process. What is the first step to occur during the initialization process?

    • Scanning for downstream carrier.

    • Ranging.

    • Obtaining an IP address.

    • Downloading configuration data.

    Correct Answer
    A. Scanning for downstream carrier.
    Explanation
    The first step to occur during the initialization process of a DOCSIS modem is scanning for downstream carrier. This is because the modem needs to find and lock onto the downstream signal from the cable system before it can proceed with the rest of the initialization process, such as ranging, obtaining an IP address, and downloading configuration data.

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  • 20. 

    Which of the following statements is true regarding the wireless industry? 

    • It is evolving quickly and rather unpredictably as the products and services are changing.

    • It has no set of competing standards for communications protocols, interfaces, and networks.

    • It only uses visible light waves to carry a signal through atmospheric space rather than along a wire.

    • It has appeal because all frequencies do not require any form of licensing by the Federal Communications Commission.

    Correct Answer
    A. It is evolving quickly and rather unpredictably as the products and services are changing.
    Explanation
    The wireless industry is constantly changing and evolving at a fast pace, making it unpredictable. This is because new products and services are constantly being developed and introduced. The industry is characterized by rapid advancements, innovations, and emerging technologies, which contribute to its quick and unpredictable nature.

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  • 21. 

    Which of the following is true about cellular technologies?

    • CDMA spread spectrum technology separates users by assigning them digital codes within the available frequency.

    • CDMA makes it easy for hackers to grab orderly, meaningful data and does not ensure secure communications.

    • FDMA divides the frequency spectrum into time slots, and TDMA divides the frequency spectrum into frequency slots.

    • CDMA has the same capacity of TDMA but nearly 10 times that of FDMA.

    Correct Answer
    A. CDMA spread spectrum technology separates users by assigning them digital codes within the available frequency.
    Explanation
    CDMA spread spectrum technology separates users by assigning them digital codes within the available frequency. This means that each user is assigned a unique code, allowing multiple users to share the same frequency without interfering with each other. This technology provides a higher capacity for simultaneous communication compared to FDMA and TDMA. It also provides better security as the digital codes make it difficult for hackers to intercept and decipher the data being transmitted.

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  • 22. 

    In the token-passing process, 

    • Each station receives and then regenerates the token.

    • Network access is disorderly and response time is unpredictable.

    • If any station or node goes down, the entire network collapses only when bypass software is used.

    • When the addressed station receives the data, it cannot modify the packet's control field.

    Correct Answer
    A. Each station receives and then regenerates the token.
    Explanation
    In the token-passing process, each station receives and then regenerates the token. This means that the token, which is a special control message, is passed sequentially from one station to another in a network. Each station receives the token, performs its required actions, and then passes the token to the next station. This ensures that each station has an equal opportunity to transmit data and prevents collisions in the network. By regenerating the token, each station ensures that the token keeps circulating in the network, allowing for fair access to the network resources.

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  • 23. 

    Studies of trouble call resolution data show that the majority of ingress/noise in the upstream originates in the customer premises. What can be installed to eliminate or minimize ingress/noise that originates in the customer premises? 

    • Two-way house amplifiers, window filters, or step attenuators.

    • High-pass filters, two-way house amplifiers, or step attenuators.

    • High-pass filters, window filters, or step attenuators.

    • High-pass filters, window filters, or two-way house amplifiers.

    Correct Answer
    A. High-pass filters, window filters, or step attenuators.
    Explanation
    High-pass filters, window filters, and step attenuators can be installed to eliminate or minimize ingress/noise that originates in the customer premises. These devices are designed to filter out unwanted frequencies and attenuate the signal, reducing the interference caused by ingress/noise.

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  • 24. 

    What is the preferred connection when connecting the cable modem to the customer's computer? 

    • Using an unshielded twisted-pair (UTP) cable.

    • Using a flat silver-satin telephone cable.

    • Using a shielded twisted-pair (STP) cable.

    • Using the universal serial bus (USB) cable.

    Correct Answer
    A. Using an unshielded twisted-pair (UTP) cable.
    Explanation
    The preferred connection when connecting the cable modem to the customer's computer is using an unshielded twisted-pair (UTP) cable. This type of cable is commonly used for Ethernet connections and is designed to reduce electromagnetic interference. It is a reliable and cost-effective option for connecting the cable modem to the computer.

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  • 25. 

    Which of the following devices is the best choice when trying to isolate the cause of cable telephony or high-speed data (HSD) cable modem performance problems? 

    • A ground fault detector can easily isolate the cause of cable telephony or HSD cable modem problems in the drop system.

    • A modem emulator function in a signal level meter (SLM) can aid in troubleshooting the cause of cable telephony or HSD cable modem problems in the drop system.

    • A digital multimeter (DMM) can easily isolate the cause of cable telephony or HSD cable modem problems in the drop system.

    • A return path tester can be used to easily isolate the cause of cable telephony or HSD cable modem problems in the drop system.

    Correct Answer
    A. A modem emulator function in a signal level meter (SLM) can aid in troubleshooting the cause of cable telephony or HSD cable modem problems in the drop system.
    Explanation
    A modem emulator function in a signal level meter (SLM) can aid in troubleshooting cable telephony or high-speed data (HSD) cable modem problems in the drop system. This device can simulate the behavior of a cable modem, allowing technicians to test and diagnose potential issues without actually connecting a real modem. By using the modem emulator function, technicians can isolate the cause of the problems and determine if it is related to the cable modem or other factors in the system. This helps in efficiently identifying and resolving performance issues in cable telephony or HSD cable modem systems.

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  • 26. 

    Microwave-based local area networks 

    • Are available in analog and digital system configurations, with analog configurations dominating the current products.

    • Must use line-of-sight for the transmit/receive antennas, which cannot be more than about 30 miles apart.

    • Are not affected by atmospheric conditions such as rain and humidity.

    • Using digital technology consist of four major components on both sides of the link: modem, RF unit, waveguide, and an antenna.

    Correct Answer
    A. Must use line-of-sight for the transmit/receive antennas, which cannot be more than about 30 miles apart.
    Explanation
    Microwave-based local area networks must use line-of-sight for the transmit/receive antennas, which cannot be more than about 30 miles apart. This means that there should be a clear path between the antennas without any obstacles such as buildings or trees. This is because microwaves used in these networks have a high frequency and short wavelength, which allows them to transmit data quickly but also makes them susceptible to interference from obstacles. Therefore, the antennas need to be within a certain distance to ensure a clear and reliable connection.

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  • 27. 

    Which of the following describes why the hybrid fiber/coax (HFC) return path design is especially sensitive to ingress and noise? 

    • Ingress and noise from each drop is filtered at each common point, affecting only the signals from that drop's customer premises equipment (CPE).

    • Ingress and noise from each drop is carried independently over fiber to the headend where the noise is filtered out.

    • Ingress and noise from multiple drops along a service area funnels into a common point, affecting all signals from that service area.

    • Ingress and noise from multiple drops funnels into multiple points along the return path, affecting just the signals from the first service area.

    Correct Answer
    A. Ingress and noise from multiple drops along a service area funnels into a common point, affecting all signals from that service area.
    Explanation
    In a hybrid fiber/coax (HFC) return path design, the ingress and noise from multiple drops along a service area all converge into a common point. This means that any ingress or noise from one drop can affect all signals from that entire service area. This sensitivity to ingress and noise is due to the fact that all the signals are funneled into a single point, making it more susceptible to interference.

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  • 28. 

    In a cellular phone system, 

    • Typically, every seventh cell uses the same set of frequencies.

    • Cells use an unlimited number of transmission frequencies.

    • The base station hands off the call to the mobile switching center in the next cell into which the user is traveling.

    • Two cells can use the same frequency for different conversations as long as the cells are adjacent to each other.

    Correct Answer
    A. Typically, every seventh cell uses the same set of frequencies.
    Explanation
    In a cellular phone system, typically every seventh cell uses the same set of frequencies. This is because the cells are organized in a pattern called a frequency reuse pattern. In this pattern, the available frequencies are divided into groups, and each group is assigned to a set of cells. The cells within each group are spaced apart by a certain distance, such as six cells, so that they do not interfere with each other. This allows for efficient use of the limited frequency spectrum and helps to minimize interference between cells.

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  • 29. 

    Synchronous optical network (SONET)

    • Defines the properties of an optical bit stream that specify the characteristics of optical fiber, which allow data to move across the medium.

    • Is based upon half the fundamental rate of 150 Mbps.

    • Is identical to synchronous digital hierarchy.

    • Cannot be installed over fiber because it was designed to operate over copper cable by ensuring interoperability.

    Correct Answer
    A. Defines the properties of an optical bit stream that specify the characteristics of optical fiber, which allow data to move across the medium.
  • 30. 

    Dotted decimal notation

    • Divides a 32-bit IP address into four 8-bit (1-byte) fields, with the value of each field specified as a decimal number.

    • Expresses IP addresses via the use of three-letter identifiers with "com" or "edu" endings separated by hyphens.

    • IP addresses can be translated into meaningful and easy-to-remember domain names through the use of an EDU server.

    • For Class A addresses sets the left-hand bit position in the first byte field to five.

    Correct Answer
    A. Divides a 32-bit IP address into four 8-bit (1-byte) fields, with the value of each field specified as a decimal number.
    Explanation
    The given answer correctly explains dotted decimal notation. It states that dotted decimal notation divides a 32-bit IP address into four 8-bit (1-byte) fields, with the value of each field specified as a decimal number. This notation is commonly used to represent IP addresses and makes it easier for humans to read and understand the address.

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  • 31. 

    Which eight-position, eight-contact (8P8C) modular connector wiring scheme is recommended for residential use? 

    • ANSI/TIA/EIA-5708.

    • T568B.

    • T568A.

    • Universal Service Order Codes (USOC).

    Correct Answer
    A. T568A.
    Explanation
    The T568A wiring scheme is recommended for residential use. This wiring scheme is commonly used for Ethernet connections and is the most widely used wiring standard. It specifies the arrangement of the eight wires in the connector, ensuring that the connection is made correctly and consistently. The T568A scheme is compatible with most networking equipment and is the preferred choice for residential installations.

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  • 32. 

    Which of the following procedures will reduce impulse noise? 

    • Impulse noise can be reduced by transmitting power on the distribution amplifiers.

    • Impulse noise can be reduced by tightening all connections and installing 75 Q terminators on unused tap ports.

    • Impulse noise can be reduced by locating taps and splitters close to switching power supplies.

    • Impulse noise can be reduced by tightening all connections and installing 10 dB attenuator pads on all used tap ports.

    Correct Answer
    A. Impulse noise can be reduced by tightening all connections and installing 75 Q terminators on unused tap ports.
    Explanation
    Tightening all connections and installing 75 Q terminators on unused tap ports can reduce impulse noise. This is because loose connections can cause signal interference and create noise, while terminators on unused tap ports help to absorb and eliminate any unwanted signals or noise that may be present in the system. By implementing these measures, the overall quality and clarity of the signal can be improved, reducing the impact of impulse noise.

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  • 33. 

    What layers of the open systems interconnection (OSI) model are applied between Data Over Cable Service Interface Specification (DOCSIS) modems and the cable modem termination system (CMTS)? 

    • Layers four through seven (Transport Layer, Session Layer, Presentation Layer, and Application Layer) are applied between the DOCSIS modem and CMTS.

    • Layers one through four (Simple Network Management Protocol, Trivial File Transfer Protocol, Dynamic Host Configuration Protocol, and E-mail) are applied between the DOCSIS modem and CMTS.

    • Layers four through seven (Physical Layer, Data Link Layer, Network Layer, and Transport Layer) are applied between the DOCSIS modem and CMTS.

    • Layers one through four (Physical Layer, Data Link Layer, Network Layer, and Transport Layer) are applied between the DOCSIS modem and CMTS.

    Correct Answer
    A. Layers one through four (Physical Layer, Data Link Layer, Network Layer, and Transport Layer) are applied between the DOCSIS modem and CMTS.
    Explanation
    The correct answer is that layers one through four (Physical Layer, Data Link Layer, Network Layer, and Transport Layer) are applied between the DOCSIS modem and CMTS. This means that the communication between the DOCSIS modem and CMTS involves the physical transmission of data, the establishment of a reliable connection, the routing of data packets, and the management of end-to-end communication. These layers are responsible for ensuring that the data is properly transmitted, received, and delivered between the two devices.

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  • 34. 

    If the drop loss at the ground block is 3.2 dB and is connected to a three-way splitter's hot leg and then connected to the 9 dB leg of a directional coupler (DC), what will be the total return path loss? 

    • The drop cable loss is 3.2 dB plus 7.0 dB (the loss of a three-way splitter) plus 9 dB (DC loss), for a total of 19.2 dB in drop return path loss.

    • The drop cable loss is 3.2 dB minus 3.5 dB (the hot-leg loss of a three-way splitter) plus 9 dB (DC loss) for a total of 8.7 dB in drop return path loss.

    • The drop cable loss is 3.2 dB plus 3.5 dB (the hot-leg loss of a three-way splitter) plus 9 dB (DC loss), for a total of 15.7 dB in drop return path loss.

    • The drop cable loss is 3.2 dB plus 3.5 dB (the hot-leg loss of a three-way splitter) minus 9 dB (DC loss), for a total of -2.3dB in drop return path loss.

    Correct Answer
    A. The drop cable loss is 3.2 dB plus 3.5 dB (the hot-leg loss of a three-way splitter) plus 9 dB (DC loss), for a total of 15.7 dB in drop return path loss.
    Explanation
    The total return path loss is calculated by adding the drop cable loss (3.2 dB) to the hot-leg loss of a three-way splitter (3.5 dB) and the DC loss (9 dB). This gives a total of 15.7 dB in drop return path loss.

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  • 35. 

    What Internet protocol (IP) address modes can a Data Over Cable Service Interface Specification (DOCSIS) 3.0 modem be provisioned in? 

    • IP version 4 (IPv4), IP version 6 (IPv6), dynamic host configuration protocol (DHCP), and dual-stack mode (DPM).

    • IP version 4 (IPv4), IP version 6 (IPv6), alternate provisioning mode (APM), and dual-stack mode (DPM).

    • IP version 4 (IPv4), IP version 6 (IPv6), alternate provisioning mode (APM), and dynamic host configuration protocol (DHCP).

    • IP version 4 (IPv4), IP version 6 (IPv6), IP multicast, and dual-stack mode (DPM).

    Correct Answer
    A. IP version 4 (IPv4), IP version 6 (IPv6), alternate provisioning mode (APM), and dual-stack mode (DPM).
    Explanation
    A Data Over Cable Service Interface Specification (DOCSIS) 3.0 modem can be provisioned in IP version 4 (IPv4), IP version 6 (IPv6), alternate provisioning mode (APM), and dual-stack mode (DPM). This means that the modem can support both IPv4 and IPv6 protocols, as well as different provisioning modes such as APM and DPM. The inclusion of dual-stack mode allows the modem to handle both IPv4 and IPv6 traffic simultaneously.

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  • 36. 

    How is the data throughput of the hybrid fiber/coax (HFC) network most accurately measured?

    • From the customer's computer to the throughput server that is connected to the cable modem termination system (CMTS) in the headend or hub.

    • From the customer's computer to a Web site server on the Internet.

    • From the customer's computer to a speed test Web site on the Internet.

    • From the customer's computer to a special cable modem located in the headend or hub.

    Correct Answer
    A. From the customer's computer to the throughput server that is connected to the cable modem termination system (CMTS) in the headend or hub.
    Explanation
    The data throughput of the hybrid fiber/coax (HFC) network is most accurately measured from the customer's computer to the throughput server that is connected to the cable modem termination system (CMTS) in the headend or hub. This is because the CMTS is the central point where the network connects to the internet and where the data transmission is managed. By measuring the throughput from the customer's computer to this server, it provides an accurate representation of the network's performance and the actual data speed experienced by the customer.

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  • 37. 

    A communications satellite 

    • Contains 42 translators, which are similar to transceivers, each a dedicated communications channel.

    • Has a translator that receives a signal from an earth station, amplifies the signal, changes its frequency, and then retransmits the signal back to Earth.

    • Operating at low earth orbit (LEO) is traveling at an elevation between 1,800 and 6,500 miles.

    • Operating at a geostationary orbit (GEO) is traveling above the equator at an altitude of 22,300 miles.

    Correct Answer
    A. Operating at a geostationary orbit (GEO) is traveling above the equator at an altitude of 22,300 miles.
    Explanation
    The correct answer is that operating at a geostationary orbit (GEO) means that the satellite is traveling above the equator at an altitude of 22,300 miles. This type of orbit allows the satellite to remain in a fixed position relative to the Earth's surface, making it ideal for communication purposes. By staying in this orbit, the satellite can provide continuous coverage to a specific region on Earth.

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  • 38. 

    In Ethernet LAN configurations, 

    • The system is described as a heavy-duty network because as the number of hosts increase, the share each gets of the total available bandwidth increases.

    • The 10BaseT supports a 100 Mbps transmission rate and uses a bus topology, which is implemented by a hub or wiring concentrator.

    • Gigabit Ethernet can operate over fiber-optic, CAT-5 UTP, and coaxial cabling, typically.

    • The 100BaseT standard does not support applications and networking software running on 10BaseT networks.

    Correct Answer
    A. Gigabit Ethernet can operate over fiber-optic, CAT-5 UTP, and coaxial cabling, typically.
    Explanation
    The given answer is correct because Gigabit Ethernet is capable of operating over different types of cabling, including fiber-optic, CAT-5 UTP, and coaxial. This flexibility allows for faster transmission rates and greater bandwidth capacity compared to other Ethernet standards.

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  • 39. 

    Virtual private networks (VPNs)

    • Maintain the privacy of communications mainly by encrypting and tunneling the data forwarded between sites.

    • Continue the connection between locations even after the transmission session is terminated.

    • Are characterized by connections that occur between point-to-point secure clients and are controlled by hardware and switching made prior to the connection.

    • Are static and maintain permanent links between the end-points that make up the corporate network.

    Correct Answer
    A. Maintain the privacy of communications mainly by encrypting and tunneling the data forwarded between sites.
    Explanation
    VPNs maintain the privacy of communications by encrypting and tunneling the data forwarded between sites. Encryption ensures that the data is scrambled and cannot be easily understood if intercepted, while tunneling allows the data to be transmitted securely through public networks. By combining these two techniques, VPNs ensure that sensitive information remains private and protected from unauthorized access.

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  • 40. 

    What is channel bonding?

    • Channel bonding combines the data throughput of a single channel with a number of channels to achieve a maximum data throughput equal to the cumulative total of the bonded channels.

    • Channel bonding ties the downstream and upstream RF data carriers to fixed frequencies so that the cable modem always knows what frequency to tune to receive downstream data.

    • Channel bonding combines the data throughput of up to eight adjacent data channels to create a single wide bandwidth data channel to achieve a maximum data throughput equal to the cumulative total of the bonded channels.

    • Channel bonding ties the downstream cable modem carrier to the out-of-band (00B) data carrier sent to the digital set-top box (STB) to enable the cable modem to receive television signals over the Internet.

    Correct Answer
    A. Channel bonding combines the data throughput of a single channel with a number of channels to achieve a maximum data throughput equal to the cumulative total of the bonded channels.
    Explanation
    Channel bonding is a technique used to increase the data throughput of a network connection by combining multiple channels. By combining the data throughput of a single channel with a number of additional channels, the maximum data throughput can be increased to the cumulative total of all the bonded channels. This allows for faster and more efficient data transmission, improving overall network performance.

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  • 41. 

    In the RF return, what is the relationship between noise, data rate, and bandwidth? 

    • The lower the bandwidth, the higher the data throughput, the higher the susceptibility to noise.

    • The higher the bandwidth, the higher the data throughput, the lower the susceptibility to noise.

    • The higher the bandwidth, the lower the data throughput, the higher the susceptibility to noise.

    • The higher the bandwidth, the higher the data throughput, the higher the susceptibility to noise.

    Correct Answer
    A. The higher the bandwidth, the higher the data throughput, the higher the susceptibility to noise.
    Explanation
    The relationship between noise, data rate, and bandwidth is that the higher the bandwidth, the higher the data throughput, and consequently, the higher the susceptibility to noise. This means that as the bandwidth increases, more data can be transmitted, but there is also a greater chance for noise to interfere with the signal. Therefore, a higher bandwidth can result in a higher data rate, but it also increases the likelihood of noise affecting the transmission.

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  • 42. 

    Which of the following device applications can be used in a system to reduce ingress noise? 

    • The use of a step attenuator or a high-pass filter on the combiner at the headend will block any noise generated on the drop in the return frequencies from entering the leg.

    • The use of a step attenuator between the drop and the cable modem will block any noise generated on the drop in the return frequencies from entering the leg.

    • The use of a diplex filter at the ground block will block any noise generated on the drop in the return frequencies from entering the leg.

    • The use of a high-pass filter at the tap will block any noise generated on the drop in the return frequencies from entering the leg.

    Correct Answer
    A. The use of a high-pass filter at the tap will block any noise generated on the drop in the return frequencies from entering the leg.
    Explanation
    Question #22: Multiple Choke - choose 1 answer (pg 3.8)
    Which of the following device applications can be used in a system to reduce ingress noise?
    A) The use of a step attenuator or a high-pass filter on the combiner at the headend will block any noise generated on the drop in the return frequencies from entering the leg.
    B) The use of a step attenuator between the drop and the cable modem will block any noise generated on the drop in the return frequencies from entering the leg.
    C) The use of a diplex filter at the ground block will block any noise generated on the drop in the return frequencies from entering the leg.
    D) The use of a high-pass filter at the tap will block any noise generated on the drop in the return frequencies from entering the leg.

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  • 43. 

    What are three primary features of Data Over Cable Service Interface Specification (DOCSIS) version 3.0? 

    • Channel bonding, IP version 6 (IPv6) support, and enhanced use of IP broadcast.

    • Channel bonding, IP version 6 (IPv6) support, and enhanced use of IP multicast.

    • Channel bonding, IP version 6 (IPv6) support, and best effort delivery of IP multicast.

    • Channel bonding, IP version 6 (IPv6) support, and exclusive quality of service (QoS).

    Correct Answer
    A. Channel bonding, IP version 6 (IPv6) support, and enhanced use of IP multicast.
    Explanation
    The three primary features of DOCSIS version 3.0 are channel bonding, IP version 6 (IPv6) support, and enhanced use of IP multicast. Channel bonding allows for the aggregation of multiple channels to increase data throughput. IPv6 support enables the use of the newer version of the Internet Protocol, which allows for a larger number of unique IP addresses. Enhanced use of IP multicast improves the efficiency of data transmission by allowing for the simultaneous delivery of data to multiple recipients.

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  • 44. 

    Wireless local area networks (WLANs) 

    • Are more reliable than wired LANs; error rates are lower when compared with wired media.

    • Are regulated by the IEEE 802.11 standard, which defines some common features for connectivity on the 2.4 GHz licensed radio band.

    • Have the exact same physical medium as the wired media; both are shared and have limited point-to-point connection ranges.

    • Are flexible communications systems implemented as extensions to or as alternatives for the wired LANs in buildings or on campuses.

    Correct Answer
    A. Are flexible communications systems implemented as extensions to or as alternatives for the wired LANs in buildings or on campuses.
    Explanation
    Wireless local area networks (WLANs) are flexible communications systems that can be implemented as extensions to or alternatives for wired LANs in buildings or on campuses. They provide the convenience of wireless connectivity, allowing devices to connect to the network without the need for physical cables. WLANs offer flexibility in terms of mobility, as users can move around within the coverage area while maintaining network connectivity. This makes them a suitable choice for environments where wired connections may be impractical or inconvenient.

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  • 45. 

    In ISDN, which of the following is true regarding the basic rate interface (BRI)?

    • The BRI is appropriate for a business that utilizes a T-1 line, since it offers an economic alternative for connecting analog PBXs, LANs, and other devices to the network.

    • The BRI uses one "B" channel and 23 "D" channels, all at 128 kbps, yielding a 1.544 Mbps line.

    • The BRI is a "2B+D" interface, with two 64 kbps bearer ("B") channels that can carry voice, data or video, and one 16 kbps data ("D") channel that provides intelligent line management.

    • The phone company replaces the basic rate interface (BRI) circuit with a conventional analog circuit.

    Correct Answer
    A. The BRI is a "2B+D" interface, with two 64 kbps bearer ("B") channels that can carry voice, data or video, and one 16 kbps data ("D") channel that provides intelligent line management.
    Explanation
    The BRI interface in ISDN consists of two 64 kbps bearer channels (B channels) that can carry voice, data, or video, and one 16 kbps data channel (D channel) that provides intelligent line management. This configuration allows for simultaneous transmission of multiple types of information over a single BRI line.

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  • 46. 

    Of the two sets of protocols, transmission control protocol/Internet protocol (TCP/IP) and simple network management protocol (SNMP), which is used for routing the packets of data over the Internet? 

    • TCP/IP provides the basic protocol for directing data traffic over the Internet by dividing the data packet into four elements: the packet sequence; the data; the destination address; and the checksum of data.

    • TCP/IP provides the basic protocol for directing data traffic over the Internet by dividing the data packet into two elements: the data and the destination address.

    • SNMP provides the basic protocol for directing data traffic over the Internet by dividing the data packet into four elements: the packet sequence; the data; the destination address; and the checksum of data.

    • SNMP provides the basic protocol for directing data traffic over the Internet by dividing the data packet into two elements: the data and the destination address.

    Correct Answer
    A. TCP/IP provides the basic protocol for directing data traffic over the Internet by dividing the data packet into four elements: the packet sequence; the data; the destination address; and the checksum of data.
    Explanation
    TCP/IP is the correct answer because it is the set of protocols used for routing packets of data over the Internet. It divides the data packet into four elements: the packet sequence, the data, the destination address, and the checksum of data. This division allows for efficient and reliable transmission of data over the network. SNMP, on the other hand, is a different set of protocols used for network management, not for routing data packets.

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  • 47. 

    What is a common solution to impulse noise and ingress problems in the network where tap values are less than 17 dB? 

    • Replacing tap plates of 17 dB or less with higher value tap plates.

    • Installing high-pass filters on all unused tap ports.

    • Installing high-pass filters on tap ports that are 17 dB or less.

    • Installing terminators on all unused tap ports.

    Correct Answer
    A. Installing terminators on all unused tap ports.
    Explanation
    Installing terminators on all unused tap ports is a common solution to impulse noise and ingress problems in the network where tap values are less than 17 dB. Terminators help to absorb and eliminate any unwanted signals or noise that may be present on the unused tap ports, ensuring a cleaner and more reliable network signal. This solution is effective in reducing interference and improving the overall performance of the network.

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  • 48. 

    Of the four Internet protocol (IP) provisioning modes available in Data Over Cable Service Interface Specification (DOCSIS) 3.0, which are designed to provide a smooth transition from IP version 4 (IPv4) to IP version 6 (IPv6)? 

    • Dynamic host configuration provisioning (DHCP) and dual-stack provisioning mode (DPM).

    • Alternate provisioning mode (APM) and multistack provisioning mode (MPM).

    • Alternate provisioning mode (APM) and dual-stack provisioning mode (DPM).

    • Alternate provisioning mode (APM) and dynamic host configuration protocol (DHCP) mode.

    Correct Answer
    A. Alternate provisioning mode (APM) and dual-stack provisioning mode (DPM).
  • 49. 

    The cellular network 

    • Since 1969 exclusively has used a simplex mode of operation and manual call placement.

    • Uses a base station consisting of a transmitter, receiver, controller, and an antenna system and has a wired link to a mobile switching center (MSC).

    • Is any mobile communications network with a series of overlapping hexagonal cells in a honeycomb pattern.

    • Began with the advanced mobile phone service (AMPS) that was introduced in the United States in 1993.

    Correct Answer
    A. Is any mobile communications network with a series of overlapping hexagonal cells in a honeycomb pattern.
    Explanation
    The given correct answer states that a cellular network is any mobile communications network with a series of overlapping hexagonal cells in a honeycomb pattern. This is an accurate explanation of a cellular network as it describes the physical layout of the network, where each cell represents a geographic area covered by a base station. The hexagonal shape allows for efficient coverage and minimizes interference between cells. This is a fundamental concept in cellular network design and operation.

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Quiz Review Timeline (Updated): Jul 19, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jul 19, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 04, 2016
    Quiz Created by
    Clash55789
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