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TEST: FIELD TECH II - III
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Which of these components is used in a passive optical network (PON)? Correct Answer: Optical splitters. Which should be used to cut the fiberdrop's buffer tube? Correct Answer: A tube cutter 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. When a pre-connectorized fiber is not attached to equipment, what should be attached to help keep it clean? Correct Answer: A dust cap Simplify and solve the equation: If E = IR then I =?
Correct Answer: E/R (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 7 3/8 divided by 7 1/4 = Correct Answer: 1 1/ (20) / (-4) + (-2) x (-10) - (-2) x (7) = Correct Answer: 29 What should you avoid to prevent stress? Correct Answer: Excessive caffeine It is essential to pay attention to warning signs of stress overload. Poor attitude is one of the behaviors that may indicate that you are overstressed. What are the symptoms of poor attitude behavior? Correct Answer: A significant change in attitude with a noticeable movement toward negative, hostile, cynical, or paranoid thoughts During which step of the six-step troubleshooting process for a digital TV (DTV) service problem are quadrature amplitude modulation (QAM) channel measurements typically taken?
What uses the 2.4-GHz band and runs at 54 Mbps? Correct Answer: 802.11g What is the last step of the basic wireless access point (WAP) setup? Correct Answer: Apply security. Why are wireless local area networks (WLAN) usually deployed in an access capacity instead of as the network's core layer? 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. Wireless internet service providers (ISP) provide which of one of the following services? Correct Answer: Last mile data delivery What is a symptom of a high voltage standing wave radio (VSWR) in a radio transmitter? Correct Answer: high voltage standing wave radio How does an antenna create gain in the received signal? Correct Answer: The antenna's shape focuses the received signal into a tighter beam
A transmitter outputs 100 milliwatts (mW). An antenna cable connects the transmitter to an amplifier, and the power into the amplifier's input measures 50 mW. The amplifier increases the signal to the original transmitter's power level and sends the signal to the antenna. The antenna receives the signal from the amplifier at 75 mW, and then transmits at 150 mW. What is the intentional radiator's (IR) power level in this radio frequency (RF) circuit? Correct Answer: 75 mW Which of the following is an advantage of 802.11b direct sequence spread spectrum (DSSS) over 802.11 frequency hopping spread spectrum (FHSS)? Correct Answer: **Data throughput What is the width of direct sequence spread spectrum (DSSS) channels and how far apart are their center frequencies spaced? Correct Answer: 22 megahertz (MHz) and 5 MHz. What statement best describes frequency-hopping spread spectrum's (FHSS) use of frequency agility? Correct Answer: It refers to a radio's ability to change transmission frequency abruptly within the usable RF frequency band. When a wireless bridge is configured in repeater mode, the range of the wireless segment can be extended at the expense of which of the following?
Correct Answer: Insertion loss Which of the Institute of Electronics Engineers (IEEE) wireless LAN standards listed below is the only one that includes infrared technology? Correct Answer: 802. Operation as an IEEE 802.11ac device occurs only in the 5 gigahertz (GHz) Unlicensed National Information Infrastructure (U-NII) radio band, so how are 802.11ac devices able to maintain compatibility with earlier standards that operate in the 2.4 GHz Industrial, Scientific, and Medical (ISM) radio bands? Correct Answer: IEEE 802.11ac devices also operate in the 2.4 GHz ISM range. What are some Federal Communications Commission (FCC) regulations within which wireless local area networks (LAN) and devices must operate Correct Answer: What three levels of security does virtual private network (VPN) technology provide in a wireless local area network (LAN)? Correct Answer: User authentication, data encryption, and data authentication Which term describes the operation mode of a basic service set (BSS)? Correct Answer: Infrastructure mode.
What must a wireless local area network (LAN) comprised of multiple cells have in order for connected clients to roam seamlessly between cells? Correct Answer: What is a slot time in an IEEE 802.11 wireless local area network (WLAN)? Correct Answer: A standard period of time on a WLAN that each station multiplies by a random number to determine the length of time to wait before performing a clear channel assessment (CCA). Why is the Carrier Sence Multiple Access/Collision Avoidance (CSMA/CA) protocol used to prevent collisions in a wireless local area network (LAN)? Correct Answer: It is impossible to detect collisions on a wireless LAN What does the "on with threshold" setting of the Request to Send/Clear to Send (RTS/CTS) protocol allow the wireless local area network (WLAN) administrator to control? Correct Answer: To control which frames over a certain size are announced and cleared to send by the stations. Which one of the following tasks is the best choice for troubleshooting the near/far problem? Correct Answer: Review the location of the stations (clients) on the network.
What should you note in the wireless local area network (WLAN) site survey if a semidirectional antenna is required for adequate coverage? Correct Answer: The antenna orientation along with the antenna's side and back lobes for coverage and security reasons. What are some requirements of a wireless local area network (WLAN) in a hospital that make it an effective training ground for individuals who want to immerse themselves in WLAN technology? Correct Answer: Roaming across large distances, a limited number of users on an access point (AP) due to mandated security, and medical applications that are often connection-oriented between the client and server. What information is vital in order to conduct a successful and thorough site survey for a wireless local area network (LAN)? Correct Answer:
