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70 Cards in this Set
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43. 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. patch cable b. horizontal cross connect c. diagonal cabling d. vertical cross connect |
43. d vertical cross connect (p. 163) |
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44. Ethernet is an example of what type of technology? a. baseband b. wideband c. narrowband d. broadband |
a. baseband (p. 216) |
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45. What is modulation? Provide two examples of how it can be used. |
(p. 214) Data modulation is a technology used to modify analog signals to make them suitable for carrying data over a communication path. In modulation, a simple wave, called a carrier wave, is combined with another analog signal, known as the information or data wave, to produce a unique signal that gets transmitted from one node to another. (1) In FM (frequency modulation) data must travel along a particular frequency. (2) In AM (amplitude modulation) the amplitude of the carrier signal is modified by the application of the data signal. |
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46. 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. terminal server b. multi- monitor breakout cable c. KVM switch d. AVR switch |
c. KVM switch |
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47. What steps should be taken to manage documentation at a cabling plant? |
(p. 165) (1) keep your cable plant documentation in a centrally accessible location. (2) label every data jack or port, patch panel or punch-down black, and connector or circuit. (3) use color- coded cables for different purposes and record the color schemes in your documentation. (4) Be certain to update your documentation as you make changes to the network. |
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48. Describe the three different types of cabling recognized by TIA/EIA as acceptable for horizontal wiring. |
(p. 162) UTP (unshielded twisted pair), STP (shielded twisted pair), fiber-optic cable |
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49. What type of power converter changes the voltage of an AC current, such as when power over the main line from an electronic company is changed before being delivered to a home? a. voltage regulator b. transformer c. inverter d. rectifier |
b. transformer (p. 175) |
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50. A measure of a signal's strength at any given time is known as which term below? a. frequency b. amplitude c. wavelength d. phase |
b. amplitude (p. 212) |
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51. Which method of transmission allows signals to travel in both directions over a medium simultaneously? a. multiplex b. simplex c. full-duplex d. half duplex |
c. full-duplex (p. 183) |
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52. What is the industry standard for rack height in rack units? a. 18U b. 42U c. 22U d. 54U |
b. 42U (p. 169) |
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53. Phone companies make use of what type of multiplexing in order to allow for phone services and DSL services over the same line? a. WDM b. DWDM c. FDM d. CWDM |
c. FDM (p. 217) |
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54. How many cable pairs are needed for 1000Base-T transmission over CAT5e cable? a. 6 b. 4 c. 2 d. 8 |
b. 4 (p. 228) |
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55. Which method of transmission allows signals to travel in both directions over a medium but in only one direction at a time? a. multiplex b. simplex c. half duplex d. full duplex |
c. half duplex (p. 183) |
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56. How does a digital signal compare to an analog signal? |
(p. 211 - 213) Analog signals, such as electromagnetic waves in the air or in copper wire, vary infinitely and continuously and appear as a wavy line when graphed over time. Digital signals are composed of pulses of precise, positive voltages and zero voltages. There’s nothing infinite or continuous about digital signal because it is inherently either on or off. |
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15. The radius of the maximum arc into which you can loop a cable without impairing data transmission is known as what option below? a. arc coefficient b. flex rating c. metal stress factor d. bend radius |
d. bend radius (p. 164) |
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16. What type of power flaw involves a fluctuation in voltage levels caused by other devices on the network or by EMI? a. noise b. surge c. blackout d. brownout |
a. noise (p. 176) |
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17. What is the maximum frame size for Ethernet II frames on a VLAN? a. 1518 bytes b. 1522 bytes c. 1500 bytes d. 1496 bytes |
b. 1522 bytes (p. 185) |
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18. What type of cross-talk occurs between wire pairs near the source of a signal? a. far end cross talk b. near end cross talk c. pair migration cross talk d. alien cross talk |
b. near end cross talk (p. 252) |
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19. Explain what a TDR is, and describe how it is used. |
Time Domain Reflectometer - Issues a signal on a cable then measures the way the signal bounces back, can also be used to indicate distance between nodes or segments. (p. 258) |
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20. What is the minimum category of UTP cable required in order to support Gigabit speeds? a. Cat 5 b. Cat 6 c. Cat 3 d. Cat 5e |
d. Cat 5e (p. 226) |
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21. 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 (p. 175) |
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22. 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 (p. 175) |
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23. The portion of an Ethernet network in which collisions could occur if two nodes transmit data at the same time. |
c. collision domain (p. 186) |
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24. The industry-standard unit for measuring rack height. Standard racks are 42U tall about 6 feet. |
i. rack unit (RU) (p. 169) |
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25. A device that maintains a constant voltage level for either AC or DC electrical energy. |
j. voltage regulator (p. 175) |
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26. The flow of electrical power at a steady rate in only one direction |
d. direct current (DC voltage) (p. p. 174) |
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27. A specialized storage device or group of storage devices that provides centralized fault-tolerant data storage for a network. |
g. NAS ( Network attached storage) (p. 171) |
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28. 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 (p. 170) |
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29. Electrical power flow on a circuit that continually switches directions. |
b. alternating current (AC) (p. 174) |
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30. 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) (p. 185) |
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57. A physical layer standard for networks that achieves 1 Gbps over Cat 6 or better cabling using only two pairs of wire a. 1000Base-LX b. 1000 Base- TX |
b. 1000 Base- TX |
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58. A character encoding system consisting of 128 characters. |
c. ASCII |
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59. Physical layer standard for networks that specifies 1-Gbps transmission over fiber-optic cable using baseband transmission, relying on 1300 nanometer wavelengths. a. 1000Base-LX b. 1000 Base- TX |
a. 1000Base-LX |
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60. A form of transmission that allows multiple signals to travel simultaneously over one medium. |
g. multiplexing |
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61. The amount of data that a medium transmits during a given period of time. |
i. throughput |
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62. Cross-talk measured at the far end of the cable from the signal source. |
f. far end cross-talk (FEXT) |
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63. The distance between corresponding points on a wave's cycle, expressed in meters or feet. |
j. wavelength |
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64. An unwanted connection, such as when exposed wires touch each other. |
h. short circuit |
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65. A multiplexing technique used over single-mode or multimode fiber-optic cfable in which each signal is assigned a different wavelength for its carrier wave |
e. DWDM(dense wavelength division multiplexing) |
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66. A term used to refer to a type of twisted-pair cable. All of the category cables fall under the TIA/EIA 568 standard. |
d. Cat (category) |
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67. Describe the differences between a brownout and a blackout. |
Brownout- a momentary decrease in voltage, AKA a sag. Recognizable as a dimming of lights. Blackout- a complete power loss. |
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68. Which of the following connectors is the most common for multimode fiber? a. ST b. MT-RJ c. SC d. FC |
b. MT-RJ (table 5-5) |
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69. 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. intermediate distribution frame b. main distribution frame c. network interface device d. entrance facility |
d. entrance facility (figure 4-2) |
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70. Where is a demarc located in relation to the structured cabling of an enterprise environment? a. in the work area b. between the MDF and the IDF c. in the Main Distribution Frame (MDF) d. at the Intermediate Distribution Fram (IDF) |
c. in the Main Distribution Frame (MDF) (Figure 4-2) |
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31. One watt is equal to how many volt-amps? a. 1.4 b. 10 c. 2 d. 1,000 |
a. 1.4 (p. 177) |
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32. What cable type comes in two different modes, single mode and multimode? a. STP b. UTP c. Coaxial d. Fiber optic |
d. fiber optic (p. 162) |
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33. The number of times that a wave's amplitude cycles from its starting point, through its highest amplitude and its lowest amplitude, and back to its starting point over a fixed period of time, is known as what term below? a. wavelength b. phase c. frequency d. amplitude |
b. phase (p. 212) |
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34. Which type of multiplexing is defined by wavelength instead of frequency? a. FDM b. CWDM c. DWDM d. WDM |
b. CWDM (p. 218) |
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35. What Ethernet standard below is also referred to as "thinnet"? a. 100BaseT b. 10BaseT c. 10Base2 d. 100Base2 |
c. 10Base2 |
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36. What is the maximum supported throughput of a CAT6 cable? a. 10 Gbps b. 100 Gbps c. 100 Mbps d. 1 Gbps |
a. 10 Gbps (p. 226) |
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37. Using a form of transmission that allows multiple signals to travel simultaneously over one medium is known as which of the following options? a. embedding b. modulating c. coupling d. multiplexing |
d. multiplexing (p. 216) |
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38. Which option below reflects the standard impedance of an RG-6 cable? a. 60 ohms b. 75 ohms c. 50 ohms d. 65 ohms |
b. 75 ohms (p. 221) |
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39. What is the maximum allowable distance for horizontal wiring? a. 90ft b. 100 ft c. 100m d. 90m |
c. 100 m |
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40. Define how phase affects an analog signal. |
The progress of a wave over time in relationship to a fixed point. Suppose two separate waves have identical amplitudes and frequences. If one wave starts at its lowest amplitude at the same time the second wave start at its highest amplitude, these waves have different phases. Had the second wave also started at its lowest amplitude, the two waves would be in phase.(p. 212) |
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41. Since cable TV and cable Internet can share the same coaxial cable, they are considered to be what type of technology? a. wideband b. broadband c. baseband d. narrowband |
b. broadband (p. 216) |
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42. WDM divides a beam of light into how many different wavelengths or colors? a. 40 b. 10 c. 20 d. 30 |
a. 40 (p.218) |
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1. When selecting a punch down block, what block type is more suitable for data connections? a. 66 block b. 22 block c. 10 block d. 110 block |
d. 110 block (p. 166) |
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2. If the use of a pre-existing Ethernet infrastructure is desired for a SAN, what Transport Layer protocol should be utilized? a. iSCSI b. SAS c. PATA d. Fibre Channel |
a. iSCSI (p. 172-173) |
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3. How far away from fluorescent lights or other sources of EMI should cable be installed? a. at least 10 ft b. at least 3 ft c. at least 20 ft d. at least 5 ft |
b. at least 3 ft (p. 164) |
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4. Standard PoE devices must be provided with how much power in order to function? a. 25.5 watts b. 15.4 watts c. 5 watts d. 12 watts |
b. 15.4 watts (p. 235) |
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5. Explain the difference between an inverter and a rectifier. |
An inverter converts DC to AC. A generator might contain an inverter. The better inverters will also condition the power, which helps protect sensitive electronic equipment from power fluctuations. A rectifier, on the other hand converts AC to DC. All computers require the constant flow of electricity that DC power provides. The power supply in a laptop or desktop computer contains a rectifier to convert AC to DC. |
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6. What is the maximum distance for 10GBase-ER and 10GBase-EW on a segment of single mode fiber? a. 300m b. 40km c. 10km d. 550m |
b. 40km |
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7. The most common multiplexing technology used in conjunction with fiber optics is which option below? a. CWDM b. FDM c. DWDM d. WDM |
c. DWDM |
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8. During termination of twisted pair cabling, what should be done to ensure minimal cross talk is introduced? a. No more than 1 in of the cable should be exposed. b. No less than 1 in of the cable should be exposed c. Each pair should be stripped of insulation so that it doesn't get caught in the jack d. each pair should be twisted around another pair to reduce cross talk. |
a. no more than 1 inch of the cable should be exposed |
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9. Describe two ways in which analog and digital signals are boosted. |
amplifier: analog signals pass through an amplifier, an electronic device that increases the voltage, or strength of signals. Unfortunately, the boost can also boost the noise that has accumulated in the signal, which causes the analog signal to worsen progressively. After multiple amplifications, an analog signal may become difficult to decipher. repeater: recall that a repeater is a device that regenerates a digital signal in its original form, without the noise it might have previously accumulated. A switch on an Ethernet network works as a multiport repeater as the bits transmitted "start over" at each port on the switch. |
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10. Which of the following options is not a likely source of electromagnetic interference? a. power lines b. motors c. fiber optic cables d. microwaves |
c. fiber optic cables |
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11. Ethernet exists at what layer of the OSI model? a. Layer 4 b. Layer 1 c. Layer 3 d. Layer 2 |
d. layer 2 |
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12. What term below is used to describe the outer-most layer of protective covering of a coaxial cable? a. sheath b. insulation c. shield d. braiding |
a. sheath |
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13. A device that is responsible for modulating digital signals into analog signals, and demodulating analog signals into digital signals at the receiving end, is known as? a. a demuxer b. a modem c. a multiplexer d. a transceiver |
b modem |
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14. 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 prevent airflow blockages. In a typical rack system, airflow through the chassis is typically designed to move from front to back. Rack-monitoring systems should be installed to sound an alarm if the rack's overall temperature rises too much, if air quality (moisture or smoke) falls below acceptable levels, or if airflow is restricted. |
