2.7 CHAPTER REVIEW
What is the maximum allowed insertion loss for Cat 5e at 100 MHz?
24 db
For a rack containing equipment that draws 2000 watts in total on a 240 VAC circuit, what is the amperage?
8.3
Which tool is used to create a patch cord by fixing a plug to a cable?
A cable crimper is specifically designed to attach RJ-type plugs to cables, making it the correct tool for creating patch cords
You are leading a team responsible for the network cabling of a large corporate building. After completing the installation, you plan to ensure that the network meets TIA/EIA 568 Category 6A compliance. Your team has access to various tools, but you want to choose the most appropriate one to certify that the installation exceeds the required performance characteristics for parameters such as attenuation and crosstalk. Which tool should you select for this task?
A high-end cable certifier is the correct answer. A high-end cable certifier is specifically designed to test and certify cable installations to ensure they meet certain performance categories, such as TIA/EIA 568 Category 6A compliance. It can accurately measure and report on critical parameters like attenuation and crosstalk, making it the ideal tool for certifying that the installation exceeds the required performance characteristics.
What is the MOST significant disadvantage of using copper cabling for networking?
A significant disadvantage of using copper cabling is high attenuation over long distances. Attenuation refers to the reduction in signal strength as it travels through the cable. For copper cabling, this means that the signal quickly loses strength over long links, which can limit the distance over which data can be transmitted without the need for signal boosters or repeaters.
You are preparing to deploy a new fiber optic link that requires minimal signal loss and very low back-reflection due to the sensitivity of the connected equipment. Which type of connector polish should you ensure is used for this installation?
Angled Physical Contact (APC) is the correct answer. APC connectors are designed to minimize back-reflection (optical return loss) by angling the end of the fiber. This is crucial for applications requiring minimal signal loss and low back-reflection, making it the best choice for sensitive equipment.
Which of the following BEST describes systems that manage and monitor various aspects of a building's environment to ensure optimal conditions for equipment and occupants?
Building Control Systems are specifically designed to manage and monitor the environmental conditions of a building, such as temperature, humidity, and air quality. These systems ensure that the building maintains an optimum working environment for both the equipment and the occupants, making them essential for the overall functionality and comfort of the building.
How can you identify transmitted optical signals when working with fiber optic patch cords?
By observing bright white spots through a smartphone camera
A network technician needs a cost-effective solution that can multiplex up to 16 wavelengths on an SFP/SFP+ interface. Which multiplexing technique should the network technician use?
Coarse Wavelength Division Multiplexing (CWDM) supports up to 16 wavelengths and typically deploys four or eight bidirectional channels over a single fiber strand.
What is a major difference when comparing Dense Wavelength Division Multiplexing (DWDM) to CWDM?
DWDM can support a higher number of channels (20, 40, 80, or 160) by using much tighter wavelength spacing, requiring more precise and expensive lasers compared to CWDM.
When troubleshooting cable connectivity issues at the Physical layer, which of the following is NOT a component typically involved in an Ethernet link for an office workstation?
Fiber optic cable between the host and a wall port
What type of cable is used to complete the link from the wall port to the Network Interface Card (NIC) and from the patch panel to the switch port in a fiber optic network?
Fiber patch cable In a fiber optic network, fiber patch cables are used to complete the connections from the wall port to the Network Interface Card (NIC) and from the fiber distribution panel (or patch panel) to the switch port. These cables are specifically designed for fiber optic systems, providing the necessary optical connection that supports the network's high-speed data transmission requirements.
Which of the following is NOT a typical use of MPO cables?
Field termination of fiber optic cables
A team of network engineers are refurbishing copper Ethernet cabling in a FEMA office. The federal government requires that copper twisted pair cabling be terminated according to the T568A standard. To ensure termination is being done according to standard, what color conductor will be wired to the second pin?
Green In T568A and T568B, wires 2 and wires 6 are flipped, so that wire 2 is green in T568A and wire 6 is green in T568B, while wire 6 is orange in T568A and wire 2 is orange according to T568B.
How is rack height measured?
In "U" units
What type of transmission is available with the contention-based MAC system utilized by Ethernet?
In a contention-based MAC system like Ethernet's, half-duplex transmission is the mode of operation where a device can either transmit or receive data at any given time, but not both simultaneously. This limitation arises from the need to manage and resolve collisions on the network. When a device is transmitting, it cannot receive at the same time, which helps in detecting collisions and managing the shared medium effectively.
Which of the following do internal sensors within servers and appliances normally monitor? (Select three.)
Internal sensors normally monitor: Excessive temperatures within the device chassis. Internal sensors are often used to monitor the temperature inside the device chassis. This is crucial for preventing overheating, which can lead to hardware damage and reduced performance. Fan speeds. Fan speeds can be monitored by internal sensors to ensure that cooling systems are functioning correctly. This helps in maintaining optimal operating temperatures and preventing overheating. Component failure. Sensors can detect component failure, allowing for timely maintenance or replacement. This helps in maintaining the reliability and performance of the device.
When terminating a structured cable at a patch panel, which of the following practices is recommended?
Labeling both ends of the cable with the appropriate jack ID before installation is the correct answer. Labeling both ends of the cable with the appropriate jack ID ensures that the cable can be easily identified at both the patch panel and the work area. This facilitates troubleshooting, maintenance, and future modifications to the network infrastructure.
You are tasked with installing structured cable from a bulk spool in a new office building. You need to ensure that the cable runs from the telecommunications closet to multiple work areas. Which of the following steps is crucial to ensure a successful installation?
Pulling the cable through conduits or wall spaces, avoiding excessive bends and proximity to electrical power cables is the correct answer. This method ensures that the cable is protected from physical damage and electromagnetic interference, which can be caused by proximity to electrical power cables and fixtures like fluorescent lights. It helps maintain the integrity and performance of the data transmission.
You are tasked with upgrading the network infrastructure of a multi-story office building. The project involves running new data cables vertically between floors to connect various network switches located in IT closets on each floor. The building does not have a centralized plenum space for HVAC systems, and instead, uses ductwork. You need to select the most appropriate type of data cable for this vertical installation to ensure compliance with fire safety standards and the building's architectural constraints. Which type of data cable should you choose for the vertical runs between floors in the multi-story office building?
Riser-rated CMR/MPR cable
A network engineer is tasked with upgrading an office network to support higher data transfer speeds for a company that specializes in graphic design. The office is currently wired with Cat 5e cabling. The engineer decides to implement Gigabit Ethernet to meet the company's needs. Which of the following standards should the engineer use for the upgrade?
The correct answer is 1000BASE-T because it is the specified standard for Gigabit Ethernet over copper wire, working over Cat 5e or better, which matches the current cabling in the office. This standard supports 1 Gbps speeds, suitable for the high data transfer needs of a graphic design company.
In a contention-based MAC system, such as that used by Ethernet, what are the consequences of adding more nodes to the network? (Select two)
The following are the consequences of adding more nodes to the network: Collisions become more frequent. As more nodes are added to a network using a contention-based MAC system, the likelihood of two or more devices attempting to transmit data simultaneously increases. This results in more collisions, where signals interfere with each other, preventing the data from being successfully transmitted. The effective data rate is reduced. With the increase in collisions due to more nodes attempting to communicate at the same time, the network must spend more time resolving these collisions (through processes like retransmission). This overhead reduces the amount of time available for actual data transmission, thereby lowering the effective data rate of the network.
Which of the following are requirements for fire-retardant plenum cable? (Select two.)
The following are the requirements for fire-retardant plenum cable: Must not emit large amounts of smoke when burned. Fire-retardant plenum cable is designed to minimize the emission of smoke when burned, which is crucial in preventing smoke damage and ensuring visibility during a fire, making it a correct requirement. Must be self-extinguishing. One of the key safety features of plenum cable is its ability to be self-extinguishing. This characteristic helps to prevent the spread of fire through the plenum spaces, aligning with strict fire safety standards required for plenum-rated cables.
Which of the following are the steps are involved in transmitting a signal using electromagnetic radiation? (Select two)
The following are the steps involved in transmitting a signal using electromagnetic radiation: Modulation. Modulation is the process of varying a carrier wave to transmit a signal, and encoding is the method of converting information into a form that can be transmitted over the wave, such as changing voltage levels to represent digital data. These steps are essential for transmitting a signal using electromagnetic radiation. Encoding. Encoding involves converting information into a form that can be transmitted, and modulation is the process of varying a carrier wave based on this information to transmit the signal. These are the two key steps in transmitting a signal using electromagnetic radiation, essentially detailing how data is prepared and then sent over electromagnetic waves.
Which of the following BEST describes a demarcation point in a structured cabling scheme?
The point at which the access provider's network terminates and the organization's network begins
A network technician is troubleshooting a newly installed Cat6 cabling system in an office environment. Users are experiencing intermittent network connectivity issues. Upon inspection, the technician notices that the cable bundles are cinched tightly with cable ties in several places along their run. What is the MOST likely cause of the connectivity issues?
The use of cable ties is causing Alien Crosstalk is the correct answer. Cinching cable bundles too tightly with cable ties can cause Alien Crosstalk, where signal traffic from cables in close proximity interferes with each other. This can lead to intermittent connectivity issues as described.
Why do equipment room and data center facilities tend to use high voltage circuits?
To allow for a higher load capacity with lower amperage High voltage circuits are used in data centers and equipment rooms because they allow for a higher load capacity while requiring lower amperage. This is beneficial because it reduces the risk of overloading circuits and allows for more efficient power distribution across the facility.
You are the network administrator for a medium-sized data center that is undergoing an upgrade to improve its network infrastructure. The upgrade includes enhancing the connections between top-of-rack (ToR) switches and servers within the same racks to support 10 GbE speeds. The distance between the switches and servers does not exceed 5 meters. You need a cabling solution that offers high-speed data transfer, minimal latency, and is cost-effective for the short distances involved. Which type of cable would be MOST appropriate for connecting the ToR switches to the servers within the same racks to meet the 10 GbE speed requirement?
Twinaxial cables with DAC transceivers is the correct answer. Twinaxial cables with Direct Attach Copper (DAC) transceivers are ideal for this scenario. They are specifically mentioned as being used for data center interconnects at 10 GbE and 40 GbE speeds. Twinaxial cables are cost-effective for short distances like the 5 meters mentioned, and DAC transceivers provide a direct, high-speed connection with minimal latency, perfectly meeting the requirements of enhancing connections between ToR switches and servers.
A network engineer is tasked with designing a new office network. The office layout includes workstations that are located more than 100 meters away from the network room. The engineer needs to choose the appropriate type of unshielded twisted pair (UTP) cable to ensure reliable data transmission over these distances. Which solution should the network engineer choose for the UTP cables that will run from the network room to the workstations?
Use UTP cables with a solid conductor and add repeaters to extend beyond 100 meters Solid conductors uses a single thick wire per conductor, which is more suitable for permanent installations and can maintain signal integrity over longer distances, making it the appropriate choice for the scenario. Solid UTP cables are suitable for distances up to 100 meters (328 feet). To extend beyond 100 meters, a repeater is necessary.
How do GG45 connectors compare to RJ45 connectors?
answer Correct Answer: GG45 connectors have a similar form factor to RJ45, but with additional conductors in the corners. GG45 connectors are designed to be backward compatible with RJ45 connectors, sharing a similar form factor. The key difference is that GG45 connectors include additional conductors in the corners, allowing for higher performance and supporting higher frequencies, which is essential for next-generation Ethernet standards.
