Chapter 4: Structured Cabling and Networking Elements

Question 24. Describe the differences between a brownout and a blackout.​

A blackout is a complete interruption of power in a given service area. Rolling blackouts are controlled and usually preplanned interruptions of service. A brownout is a partial, temporary reduction in system voltage or total system capacity. Blackouts come without warning, last for indeterminate periods, and are typically caused by catastrophic equipment failure or severe weather

Question 20. A power fluctuation that results in a temporary dimming of lights is known as a blackout.​ True or False

False

Question 25. Explain how equipment should be configured in a rack to best optimize airflow and temperature.​

Hardware should be installed as close to the front of the rack as possible to allow for proper airflow in the back. Minimizing cable clutter can also help prevent airflow blockages

Question 2.2 ​In a chassis, the path along which air from a cool air source is conducted, past equipment to cool it, and then out of the rack. Typically, air moves from front to back.

a. airflow

Question 16. ​What cable type comes in two different modes, single mode and multimode? a. ​Fiber optic b. ​Coaxial c. ​UTP d. ​STP

a. ​Fiber optic

Question 15. Select the two Transport Layer protocols that are used by SANs:​ a. ​iSCSI b. ​SATA c. ​Fibre Channel d. ​SAS

a. ​iSCSI c. ​Fibre Channel

Question 10. ​One watt is equal to how many volt-amps? a. ​10 b. 1.4​ c. ​1,000 d. ​2

b. 1.4​

Question 3. A volt-ampere (VA) is the product of the voltage and the ________________ of the electricity on a line.​

current

Question 18. Explain the difference between an inverter and a rectifier.

The difference between an inverter and a rectifier is that both perform opposite functions in electronic circuits. The Inverter converts Direct Current to Alternating Current. The rectifier does the opposite by converting Alternating Current to Direct Current.

Question 21. Each type of cable has a prescribed bend radius , which is the radius of the maximum arc into which you can loop a cable without impairing data transmission. True or False?

True

Question 8. A NIC card cannot determine whether the frames it transmits and receives are using IP packets or a different layer 3 protocol, because the NIC does not operate higher than Layer 2 of the OSI model.​ True or False?

True

Question 14. Select the maximum allowable distances for horizontal wiring for a span that connects a data jack on a wall to a data closet, and for a span that connects a workstation to the data jack, respectively: a. 10 m b. 5 m c. ​90 m d. 100 m​

a. 10 m c. ​90 m

Question 12. Cable that is coated with flame-resistant polyvinyl chloride (PVC) is acceptable for use in plenum areas. True or False

False

Question 5. Describe the three different types of cabling recognized by TIA/EIA as acceptable for horizontal wiring.​

The three different types of cabling recognized by TIA/ELA are: UTP - A copper Cable that has 2 - 1800 unshielded twists pairs surrounded by an outer jacket. STP - cable that has a metal shield that can protects wires from electromagnetic or radio interference Fiber Optic - cable that contains strands of glass fibers inside the insulated casing. Design for high-performance and long distance data networking.

Question 2.8 Electrical power flow on a circuit that continually switches direction.

b. alternating current (AC)​

Question 7. ​What is the maximum allowable distance for horizontal wiring? a. ​90 ft b. ​100 m c. ​100 ft d. ​90 m

b. ​100 m

Question 1. How far away from fluorescent lights or other sources of EMI should cable be installed?​ a. ​at least 20 feet b. ​at least 3 feet c. ​at least 5 feet d. ​at least 10 feet

b. ​at least 3 feet

Question 17. Select the component of enterprise level structured cabling that serves as the location where an incoming network interface enters a building and connects with the building's backbone cabling: a. ​main distribution frame b. ​entrance facility c. ​intermediate distribution frame d. ​network interface device

b. ​entrance facility

Question 22. ​What component of the backbone runs between a building's floors and can be used to connect an MDF and IDF or multiple IDFs? a. ​horizontal cross connect b. ​vertical cross connect c. ​patch cable d. ​diagonal cabling

b. ​vertical cross connect

Question 4. ​If the use of a pre-existing Ethernet infrastructure is desired for a SAN, what Transport Layer protocol should be utilized? a. ​PATA b. ​SAS c. ​iSCSI d. ​Fibre Channel

c. iSCSI

Question 19. Equipment racks most commonly come in what two widths?​ a. ​17 inch frame b. ​18 inch frame c. ​23 inch frame d. ​19 inch frame

c. ​23 inch frame d. ​19 inch frame

Question 9. In order to simplify console access to computers in a rack, what device is typically used to provide a central portal for all devices on the rack?​ a. ​multi-monitor breakout cable b. ​AVR switch c. ​KVM switch d. terminal server

c. ​KVM switch

Question 11. Ethernet exists at what layer of the OSI model? a. ​Layer 4 b. ​Layer 1 c. ​Layer 2 d. ​Layer 3​

c. ​Layer 2

Question 13. ​During termination of twisted pair cabling, what should be done to ensure minimal cross talk is introduced? a. ​Each pair should be stripped of insulation so that it doesn't get caught in the jack. b. ​No less than 1 inch of the cable should be exposed. c. ​No more than 1 inch of the cable should be exposed. d. ​Each pair should be twisted around another pair to reduce cross talk.

c. ​No more than 1 inch of the cable should be exposed.

Question 2.1 The portion of an Ethernet network in which collisions could occur if two nodes transmit data at the same time.​

c. ​collision domain

Question 2.10 The flow of electrical power at a steady rate in only one direction.​

d. direct current (DC)​

Question 23. ​Which method of transmission allows signals to travel in both directions over a medium but in only one direction at a time? a. ​full duplex b. ​simplex c. ​multiplex d. ​half duplex

d. ​half duplex

Question 2.5 The field in a frame responsible for ensuring that data carried by the frame arrives intact. It uses an algorithm, such as CRC, to accomplish this verification.​

e. ​FCS (frame check sequence)

Question 2.6 A device that converts DC electrical energy to AC electrical energy. Better inverters will also condition the power, which helps protect sensitive electronic equipment from power fluctuations.

f. inverter

Question 2.3 A specialized storage device or group of storage devices that provides centralized fault-tolerant data storage for a network.​

g. ​NAS (Network attached storage)

Question 2.9 A device that changes the form of electrical energy in some way. Four common types are: inverter, rectifier, transformer, and voltage regulator.

h. power converter​

Question 2.4 ​The industry-standard unit for measuring rack height. Standard racks are 42U tall — about 6 feet.

i. ​rack unit (RU)

Question 2.7 ​A device that maintains a constant voltage level for either AC or DC electrical energy.

j. voltage regulator

Question 6. A _____________ allows for an MTU as high as 9198 bytes.​

jumbo frame