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FIELD TECH II - III CONVENTIONAL –
NCTI EXAM | QUESTIONS & 100%
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What is one reason why broadband cable operators install fiber-optic cable in stages instead of changing the infrastructure all at once? Correct Answer: Changing the infrastructure all at once would cause too many service disruptions. What is the difference between the fiber-to-the-node (FTTN) and fiber-to-the-curb (FTTC) topologies? Correct Answer: An FTTC is allowed a smaller number of RF amplifiers between the optical fiber and the customer premises. Which type of star topology used in a passive optical network (PON) places the PON splitters into fiber access terminal (FAT) located deep in the network and closer to the customer premises than the centralized split? Correct Answer: Distributed star. Which element of a passive optical network (PON) uses a Bragg grating filter?
Correct Answer: Optical line terminal (OLT). Which element of a passive optical network (PON) uses patch panels? Correct Answer: Optical distribution network (ODN). What is it about radio frequency over glass (RFoG) that made broadband cable operators envision using it to make a seamless transition from the legacy hybrid fiber/coax (HFC) architecture over to a gigabit-capable passive optical network (GPON) or Ethernet passive optical network (EPON)? Correct Answer: RFoG can operate in parallel with GPON or EPON, which eliminates the need for any downtime during the transition. How are optical splitters used in the forward path? Correct Answer: In the forward path, optical splitters are used as passive branching devices that divide an optical signal across multiple output fibers. Which of the following describes a fiber pigtail? Correct Answer: Fiber-optic cable with pre-connectorized ends. Heat shrink tubing is installed over the fusion-splice to strengthen and protect it. When should the heat shrink be installed on the fiber? Correct Answer: Before stripping the plastic coating from the fiber.
10 to the power of - 3 has a metric prefix of ______. Correct Answer: Milli (480 x 10 to the power of - 5) divided by (60 x 10 to the power of - 3) = Correct Answer: 8 x 10 to the power of - 2 (250 x 10 to the power of - 6) - (7 x 10 to the power of - 5) = Correct Answer: 180 x 10 to the power of - 6 (75 × 103) + (25 × 104) = Correct Answer: 32.5 × 104 (-25) + (42) + (-62) + (20) = Correct Answer: - 25 (17) x (-19) = Correct Answer: - 323 (-17) - (-34) = Correct Answer: 17
- 49/-7 = Correct Answer: 7
(20) / (-4) + (-2) x (-10) - (-2) x (7) = Correct Answer: 29 3 6/9 + 6 1/3 + 9 5/9 = Correct Answer: 19 5/ 4/7 x 9 4/11 = Correct Answer: 5 27/ 7 3/8 divided by 7 1/4 = Correct Answer: 1 1/ 8.13 X 0.123 = Correct Answer: 0. 0.5349 divided by 0.1420 = Correct Answer: 3. Which of the following is a method for controlling expectations Correct Answer: Identify the source of emotional overload. Which of the following best describes stereotyped thinking?
Correct Answer: Notes and recorded data are tools that can help you accurately remember events at a site that can help you determine a plan of action or evaluate the decisions you made. You are at a customer's home and you believe you have solved the problem. When you check to be sure the resolution did not introduce any new problems, which step are you using from the six-step troubleshooting process? Correct Answer: Verifying the solution. To break the habit of a negative self-talk cycle Correct Answer: Tell yourself "not now" and move onto a positive thought whenever negative thoughts occur. By taking control of the expectations you have, you are Correct Answer: More likely to improve your motivation and be a better problem solver. What is it called when several computers are sharing files without a WAP? Correct Answer: ad-hoc mode. What is the standard encryption method used with WPA2? Correct Answer: AES
When configuring a wireless router, why is changing the service set identifier (SSID) from the device default recommended? Correct Answer: To avoid telling hackers exactly what the device is. Which mode uses a wireless access point (WAP) connected to a wired network? Correct Answer: Infastructure In regard to Wi-Fi networks, what is WPS used for? Correct Answer: To enable connection to a Wi-Fi network without a Windows interface. Which encryption method is the most secure for a wireless network? Correct Answer: WPA2. How many channels are available with IEEE 802.11g? Correct Answer: 11 What is the last step of the basic wireless access point (WAP) setup? Correct Answer: Apply security. All 802.11 standards use one of two frequency bands. What are these frequency bands? Correct Answer: 2.4 GHz and 5 GHz bands.
Correct Answer: WLANs are generally incapable of meeting the requirements of the network core layer, which needs to be very fast and stable, able to handle a tremendous amount of traffic with little difficulty, and must experience no down time. In which Open Systems Interconnection (OSI) reference model layer do wireless local area networks (LAN) operate? Correct Answer: The Data Link Layer. What type of connectivity is needed to connect networks between two buildings located across the street from each other? Correct Answer: Point-to-point (P2P). In which of the following applications might a wireless local area network (WLAN) be deployed in a distribution layer role? Correct Answer: As a building-to-building bridge used to link corporate network segments. What specific problem does a wireless local area network (WLAN) resolve for corporations and home users? Correct Answer: Excessive data cabling. What challenges do Wireless Internet Service Providers (WISP) have to overcome in order to provide "last mile data delivery" to customers?
Correct Answer: Distance to access points (AP), rooftop access, lightning, trees, mountains, tower access, and other physical obstacles to connectivity. In what manner do radio waves propagate (move) away from the source (antenna)? Correct Answer: In a straight line in all directions at once. Which one of the following radio frequency (RF) behaviors is defined as "the bending of a wave as it passes through a medium of different density"? Correct Answer: Refraction. Which of the voltage standing wave ratios (VSWR) shown below is best for transferring radio frequency (RF) energy between connections? Correct Answer: 1.2: What are some measures that can be taken to prevent high voltage standing wave ratios (VSWR) in transmitters and receivers? Correct Answer: Tighten connections between cables and connectors and use impedance-matched hardware throughout. How does radio frequency line-of-sight (RF LOS) differ from visual LOS? Correct Answer: RF LOS is accompanied by a Fresnel Zone, a series of concentric ellipsoid-shaped areas around the visual LOS path.
Which of the following networks or products use spread spectrum technologies? Correct Answer: Wireless local area networks (WLAN), Bluetooth, and global positioning systems (GPS). Why is spread spectrum technology used in applications such as Bluetooth wireless personal area networks (WPAN)? Correct Answer: Spread spectrum technology allows wireless networking to create a short range, personal communications network. The ratio of chipping code to data bits for a direct sequence spread spectrum (DSSS) signal is called which of the following? Correct Answer: Processing Gain Which component of frequency hopping spread spectrum (FHSS) system creates more overhead than any similar component in a direct sequence spread spectrum (DSSS) system? Correct Answer: The interframe spacing How does spread spectrum technology reduce the probability of signal jamming? Correct Answer: By transmitting over a wide frequency spectrum. What wireless local area network (WLAN) device can be described as a half-duplex device with intelligence equivalent to that of a sophisticated Ethernet switch?
Correct Answer: An access point (AP). What are some common methods used to configure and manage access points (AP)? Correct Answer: Telnet/ssh (secure shell), universal serial bus (USB), and a built-in web server for browser access. What is a half-duplex device that is only capable of Open Systems Interconnection (OSI) reference model Layer 2 connectivity? Correct Answer: A wireless bridge. Which statement best describes protocol filtering that has been implemented in a wireless bridge? Correct Answer: Allowing or denying wireless traffic using Open Systems Interconnection (OSI) reference model Layer 4 ports to filter Layer 7 applications. Which statement best describes a network application for which a wireless workgroup bridge is the best suited? Correct Answer: When remote buildings house small groups of wired clients needing wireless access to the main network. Which wireless client devices require drivers to be installed on the client node?
What is a consideration when mounting a high-gain omnidirectional antenna indoors on the ceiling? Correct Answer: If the ceiling is too high, the coverage area might not reach the floor where the users are located. As a general rule, how does an increase in effective isotropic radiated power (EIRP) relate to the link budget range? Correct Answer: Each 6 decibels (dB) increase in EIRP equates to a doubling of range. What happens when an active Ethernet switch fails to sense a power over Ethernet (PoE) device on a port? Correct Answer: It switches off the direct current (DC) voltage on that port. Which statement describes a passive injector? Correct Answer: It places direct current (DC) voltage onto a CAT-5e cable. What power over Ethernet (PoE) device picks off the direct current (DC) voltage that has been injected into the CAT-5e cable by the injector and makes it available to the equipment through the regular DC power jack? Correct Answer: A DC picker or tap.
What device would a wireless local area network (WLAN) administrator install between the access point (AP) or bridge and the network to give indoor local area network (LAN) users as much bandwidth as possible? Correct Answer: A bandwidth control unit (BCU). What is the typical coverage pattern of a semidirectional antenna? Correct Answer: A hemispherical or cylindrical pattern. What antenna type is ideal for making a point-to-point (P2P) network connection between two office buildings that are across the street from one another? Correct Answer: A semidirectional antenna. Why have 900 megahertz (MHz) Industrial, Scientific, and Medical (ISM) band wireless local area networks (WLAN) lost favor in comparison to 2.4 gigahertz (GHz) and 5 GHz frequency systems? Correct Answer: 900 MHz devices are more expensive and provide slower data throughput. What is the Federal Communications Commission (FCC) regulation for the maximum equivalent isotropically radiated power (EIRP) from a point-to-multipoint (P22P) wireless local area network (WLAN) antenna? Correct Answer: 4 watts (W).
Correct Answer: Multiple input, multiple output (MIMO) technology and spatial multiplexing. What does the Institute of Electrical and Electronics Engineers (IEEE) specify as the maximum allowable power output into the intentional radiator for IEEE 802.11a-, 802.11n-, and 802.11ac-compliant devices operating on the lower Unlicensed National Information Infrastructure (U-NII) radio band? Correct Answer: 40 milliwatts (mW). How wide is each of the three wireless local area network (WLAN) Unlicensed National Information Infrastructure (U-NII) bands? Correct Answer: 100 megahertz (MHz). When connecting to a wireless local area network (WLAN), what is the most important point about the service set identifier (SSID)? Correct Answer: That the clients and all access points (AP) must be configured with matching SSIDs. How does a client locate a wireless local area network (WLAN) when performing passive scanning? Correct Answer: The client listens for beacons until it hears a beacon listing the service set identifier (SSID) of the network it expects to join.
Why would a wireless local area network (WLAN) administrator rarely see the "authenticated" step on the access point (AP)? Correct Answer: Because clients pass the authentication stage and immediately proceed into the association stage. Why is shared key authentication considered a security risk in a wireless local area network (WLAN)? Correct Answer: The access point (AP) transmits the challenge text in the clear and receives the same challenge text encrypted with the wired equivalent privacy (WEP) key. An independent basic service set (IBSS) is also commonly referred to as which one of the following? Correct Answer: Ad hoc network. What is a wireless local area network (WLAN) service set? Correct Answer: It describes the basic components of a fully operational WLAN. Which term describes the operation mode of a basic service set (BSS)? Correct Answer: Infrastructure mode.
