Wireless Networks Troubleshooting, Security, and Standards, Exams of Electrical Engineering

Download Wireless Networks Troubleshooting, Security, and Standards and more Exams Electrical Engineering in PDF only on Docsity! NCTI Field Tech 2 to 3 Examination test with best and correct answers 1. What is one reason why broadband cable operators install fiber optic cables in stages instead of changing the infrastructure all at once - Correct answer Changing the infrastructure all at once would cause too many service disruptions 2. What is the difference between FTTN and FTTC - Correct answer FTTC is allowed a smaller number of RF amplifiers between the optical fiber and the customer premises 3. Which of these components is used in a PON(Passive Optical Network) - Correct answer Optical Splitters 4. Which type of Star topology used in a PON(Passive Optical Network) places the PON splitters into FATS(Fiber Access Terminals) located deep in the network and closer to the customer premises than the centralized split - Correct answer Distributed Star 5. Which element of a PON(Passive Optical Network) uses a Bragg grating filter - Correct answer OLT(Optical Line Terminal) 6. Which element of a PON(Passive Optical Network) uses Patch Panels - Correct answer ODN(Optical Distribution Network) 7. 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 8. 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 9. Which of the following describes a fiber pigtail - Correct answer Fiber-optic cable with pre-connectorized ends 10.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 11.Which of the following is a method for controlling expectations - Correct answer focus on the bigger picture rather than smaller tasks 12.Which of the following best describes stereotyped thinking - Correct answer Presuming that all members of a group have certain characteristics 13.The attribute of being "active" as a critical thinker means - Correct answer You observe and take notes relevant to the issue 14.What kind of reasoning is described as applying a general statement that you know to be true to a new situation - Correct answer Deductive 15. 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 16.You are at a customer's house and you are asking the customer whether the problem is intermittent or constant. Which step are you using from the six-step troubleshooting process - Correct answer Identifying the problem 17.Why should you take the time to take notes and accurately record data at each job location - 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 18.You are at a customer's home and you believe you have solved the problem. When you check to be sure there are no new problems, which step are you using - Correct answer Verifying the Solution 19.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 20.By taking control of the expectations you have you are - Correct answer more likely to improve your motivation and be a better problem solver 21.Which of the following characterizes the successful troubleshooter - Correct answer Someone with an inquisitive and relentless desire to solve and fix problems 41.A customer reports a problem of no dial tone(NDT) Upon Inspection, the tech notices that new carpenting has been installed. What should the tech do next - Correct answer Look for a cable that runs under the carpet; it is likely that the cable has a short from the carpeting tack strip 42.What is the likely problem when there is dial tone on one phone connected to an outlet, but not on two other phones connected to two different outlets - Correct answer An open circuit caused by a break in a conductor, poor contact in a modular connector, or an incorrect wire connection 43. In the customer premises, what could cause some dual tone multifrequency (DTMF) touch-tone telephones to have continuous dial tone caused by polarity reversal, but not other DTMF telephones - Correct answer The telephone wiring polarity is incorrect, and the customer has a mix of older and newer DTMF touch- tone telephones 44.What should be checked as a possible cause of hum on a customer's telephone line - Correct answer Shielding problems in the station wiring, poor terminations, or poor grounding and bonding connections 45.What is the difference between the wiring configurations for a residential 8- position, 8-contact(8P8C) modular plug and jack in the Universal Service Order Codes (USOC) and ANSI/TIA/EIA 570-B - Correct answer The placement of pair numbers 3 and 4 46.How is silver satin cable used to connect telephone equipment to wall outlets typically pinned - Correct answer Reversed at opposite ends, or cross-pinned 47. In unshielded twisted pair (UTP) cable, what is the term that describes when an information-carrying conductor makes contact with a grounded conductor - Correct answer Ground Fault 48.After resolving the problem with the premises wiring issue, which of the following is the next step in the six-step process that the tech should take - Correct answer Verify that the problem has been resolved and that phone service is running perfectly on all phones 49. If the telephone wiring is in the bus topology and the twisted-pair cable tester is connected at the embedded multimedia terminal adapter (EMTA) with the remote unit connected to the last outlet in the loop, what is the quickest way to locate the incorrectly wired outlet if the tester indicates a wiring error? - Correct answer Break the loop into smaller sections and retest the two sections to identify which one has the wiring error. Continue to divide the section with the error into smaller sections until the wiring error is identified 50.How should the digital multimeter (DMM) be used to troubleshoot problems in the telephone wiring? - Correct answer Use the voltmeter function; both the network interface device (NID) and the embedded multimedia terminal adapter (EMTA) provide a steady on-hook voltage 51.What is it called when several computers are sharing files without a WAP - Correct answer Ad-Hoc Mode 52.What is the standard encryption method used with WPA2 - Correct answer AES 53.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 54.Which mode uses a wireless access point (WAP) connected to a wired network - Correct answer Infrastructure 55. 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 56.Which encryption method is the most secure for a wireless network - Correct answer WPA2 57.How many channels are available with IEEE 802.11g - Correct answer 11 58.What is the last step of the basic wireless access point (WAP) setup - Correct answer Apply Security 59.All 802.11 standards use one of two frequency bands. What are these frequency bands - Correct answer 2.4 GHz and 5 GHz bands 60.What uses the 2.4 GHz band and runs at 54 Mbps - Correct answer 802.11g 61.Which organization regulates the use of wireless local area network (WLAN) devices in the United States - Correct answer The Federal Communications Commision (FCC) 62.Which of the following IEEE 802.11 wireless local area network (WLAN) standards specifies both spread spectrum RF and Infrared (IR) transmission tech - Correct answer 802.11 63.Why has it become cost-effective for enterprise companies to integrate wireless local area network (WLAN) segments into their networks - Correct answer The cost of wireless tech has decreased and the quality has increased 64.Which one of the following wireless standards utilizes the 5 GHz frequency band for its signal transmissions - Correct answer 802.11n 65.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 66. In which Open Systems Interconnection (OSI) reference model layer do wireless local area networks (LAN) operate - Correct answer The Data Link Layer 67.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) 68. In which of the following applications might a wireless local area network (WLAN) be deployed in a distribution layer role - Correct answer When the network requires speed, flexibility, and reliability 69.What specific problem does a wireless local area network (WLAN) resolve for corporations and home users - Correct answer Excessive data cabling 70.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 71. In what manner do radio waves propagate (move) away from the source (antenna) - Correct answer In a straight line in all directions at once 72.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 73.Which of the voltage standing wave ratios (VSWR) shown below is best for transferring radio frequency (RF) energy between connections? - Correct answer 1.2:1 74.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 throughput 75.How does radio frequency line-of-sight (RF LOS) differ from visual LOS - Correct answer LOS is accompanied by a Fresnel Zone, a series of concentric ellipsoid- shaped areas around the visual LOS path 97.Residential Gateways have been around for quite some time, but what capability was added to connect to Institute of Electrical and Electronics Engineers (IEEE) 802.11b, 802.11g, 802.11n, and 802.11ac compliant devices - Correct answer Wireless capability 98.You are designing a wireless network to which several functional workgroups are connected. You want to configure your enterprise wireless gateway to allow you to quickly assign identical network access rights to persons within the same workgroup. Which enterprise wireless gateway feature provides this capability - Correct answer Role-Based Access Control 99.What security service in an enterprise wireless gateway enables the wireless network administrator to assign levels of service to a particular user - Correct answer Class of Service (CoS) 100. Why should a wireless network administrator consider installing an enterprise wireless gateway in their network - Correct answer The enterprise wireless gateway enables the wireless network administrator to manage a large wireless network using only a few central device instead of a very large number of access ports 101. In what direction does an omnidirectional antenna radiate radio frequency (RF) energy - Correct answer Equally in all directions around its axis 102. 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 103. As a general rule, how does an increase in effective isotropic radiated power (EIRP) relate to the link budget range - Correct answer Each 6 dB increase in EIRP equates to a doubling of range 104. 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 DC voltage on that port 105. Which statement describes a passive injector - Correct answer It places direct current (DC) voltage onto a CAT-5e cable 106. 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 107. 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 108. What is the typical coverage pattern of a semidirectional antenna - Correct answer A hemispherical or cylindrical pattern 109. 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) 110. Polarization is defined as which one of the following - Correct answer Orientation of a electromagnetic wave's electric field in relationship to the Earth's surface or plane 111. Why have 900 MHz Industrial, Scientific, and Medical (ISM) band wireless local area networks (WLAN) lost favor in comparison to 2.4 GHz and 5 GHz frequency systems - Correct answer 900 MHz devices are more expensive and provide slower data throughput 112. What is the Federal Communications Commission (FCC) regulation for the maximum EIRP from a point to multipoint (P22P) wireless local area network (WLAN) antenna - Correct answer 4 Watts 113. Operation as an IEEE 802.11ac device occurs only in the 5 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 operates in the 2.4 GHz ISM range 114. Which of the following statements is true concerning Bluetooth tech - Correct answer To IEEE 802.11 networks operating in the 2.4 Industrial, Scientific, and Medical (ISM) radio bands, Bluetooth transmissions appear as all- band noise 115. What is the maximum range of Class 2, 2.5 mW Bluetooth devices - Correct answer 10 meters or 33 Feet 116. Bluetooth uses which spread spectrum tech - Correct answer Frequency Hopping Spread Spectrum (FHSS) 117. Bluetooth is a short range wireless personal area network (WPAN) tech that is covered under which Institute of Electrical and Electronics Engineers (IEEE) standard - Correct answer IEEE 802.15 118. What tech does the IEEE 802.11n wireless standard use to achieve data rates as high as 600 Mbps - Correct answer Multiple input, multiple output (MIMO) tech and spatial multiplexing 119. 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 UNII radio band - Correct answer 40 mW 120. How wide is each of the three WLAN UNII bands - Correct answer 100 MHz 121. 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 122. 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 123. 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 124. Why is shared key authentication considered a security risk in a wireless local area network (WLAN)? - Correct answer The AP transmits the challenge text in the clear and receives the same challenge text encrypted with the WEP key 125. An Independent Basic Service Set (IBSS) is also commonly referred to as which of the following - Correct answer Ad Hoc Network 126. What is a wireless local area network (WLAN) service set - Correct answer It describes the basic components of a fully operational WLAN 127. Which term describes the operation mode of a basic service set (BSS) - Correct answer Infrastructure Mode 128. In a segmented wireless local area network (WLAN) that has a different Internet Protocol (IP) address for each segment, which solution allows mobile clients to maintain their connectivity when roaming into different segments - Correct answer To deploy all access points (AP) on a single virtual local area 149. What are the three main conditions that influence the range of a wireless local area network (WLAN) - Correct answer Transmission power, antenna type and location, and environment 150. What can be done to increase the coverage area of a wireless local area network (WLAN) - Correct answer Increase the transmission power, replace the omnidirectional antenna with a parabolic antenna, and use the 2.4 GHz radio band instead of the 5 GHz radio band 151. What initialization vector (IV) do most weak implementations of the Wireless Equivalency Protocol (WEP) use? - Correct answer 24 Bit 152. How can filtering augment some of the security limitations of (WEP) in a (WLAN) - Correct answer By defining parameters to which client stations must adhere in order to gain access to the network 153. Which term describes a wireless system in which the (AP) removes the (WLAN) (SSID) from the beacon frames - Correct answer Closed System 154. (WLAN) that use an IEEE 802.1x protocol control network access on what basis - Correct answer Port Based 155. Ap must support what encryption techniques in order to comply with IEEE 802.11i security standards - Correct answer TKIP, AES, and AES- CCMP(Counter-Mode/CBC-MAC Protocol) 156. What is a main-in-the-middle attack on a WLAN - Correct answer A situation in which a hacker uses an AP to effectively hijack mobile nodes(clients) by sending a stronger signal than the legitimate AP is sending 157. What type of wireless local area network (WLAN) attack could cost an employee their job because network usage logs point directly to the employee whenever a hacker gains access to the employee's domain login information and causes havoc on the network? - Correct answer A passive attack 158. How might a wireless local area network (LAN) administrator ensure compliance with security audits? - Correct answer Document audit procedures in the security policy 159. For maximum security, you should base your wireless local area network (WLAN) user authentication on which one of the following? - Correct answer Device-independent schemes, such as user names and passwords 160. To prevent hacker access to passwords and Internet protocol (IP) addresses, why would you want to place wireless access points (AP) on switches instead of hubs? - Correct answer Switches prevent the broadcast of packets to all network segments 161. What are some basic questions you should ask a customer before visiting the customer's facility to perform a site survey - Correct answer The anticipated number of users, security required, data throughput required, and budget 162. What info should you gather during the (WLAN) Site survey in a convention center for an up and coming trade show - Correct answer ID who will be installing APA in ceiling that could be 40 ft high 163. What test should you perform during the site survey to enable the design engineer to understand and control what the user's experience will be on the WLAN - Correct answer A data throughput test 164. Why is it suggested that all data collected as part of a site survey for a wireless local area network (WLAN) be included in the survey report as an attachment, appendix, or separate set of documentation? - Correct answer The data could be needed in the future 165. What are some of the AP facts that should be detailed in a WLAN site survey - Correct answer Location within facility, antenna type to be used, power output settings, how power will be provided to unit, and the expected data throughput per unit 166. Ideally, what should your next step be after you complete the wireless local area network (WLAN) site survey and provide the survey results in a report to the customer? - Correct answer A wireless consulting firm should be given the site survey so that they will then be able to provide effective info on equipment purchasing and security solutions 167. What should you note in the WLAN site survey if a semi directional 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 168. What are some desired features of an AP used to perform WLAN site survey - Correct answer Variable output power and external antenna connectors 169. How would you use a laptop, tablet, or cell phones when performing a site survey for a WLAN - Correct answer By checking for signal strength and coverage areas while roaming around the facility 170. What are some requirements of a WLAN in a hospital that make it an effective training ground for individuals who want to immerse themselves in WLAN technologies - Correct answer Roaming across large distances, a limited number of users on an AP due to mandated security, and medical apps that are often connections-oriented between the client and the server