1- Which of the following describes frequency? length of each wave height of each wave number of cycles each second --- amount of time between each wave 2- Which of the following describe sine waves? (Choose three.) They do not continuously vary with time. They repeat the same pattern at regular intervals. --- They occur naturally and change regularly over time. --- They are artificially created and do not occur naturally. No two adjacent points on a graph have the same value. --- They have continuously varying patterns that do not repeat. 3- Identify common ways in which the capacities of communication systems are measured? (Choose two.) analog bandwidth --- resistance capacity carrier bandwidth polarity capacity digital bandwidth --- 4- Why would fiber optic installations be favored over copper between buildings? (Choose two.) cheaper installation larger media attentuation properties --- no electrical interference --- easier termination and installation 5- How are binary ones and zeros represented in fiber optic installations? (Choose two.) +5 volts/-5 volts 0 volts/5 volts light/no light --- high to low electrical transition low to high electrical transition increasing/decreasing light intensity --- 6- What are some of the factors that contribute to attenuation in a copper media? (Choose three.) type of voltage used long cable lengths --- jitter signal sent by the transmitting device defective connectors --- energy leaks through the insulation of the cable --- low signal frequencies 7- What problems are associated with impedance mismatches in copper cabling? (Choose two.) jitter --- signal absorption termination of signals reflection --- NEXT 8- What conditions are described when transmission signals from one wire pair affects another wire pair? (Choose two.) noise --- resistance mismatch jitter crosstalk --- attenuation 9- (PHOTO 1) What type of wiring problem is depicted in this sample of a cable tester? a fault a short an open --- a split a good map 10- What factors need to be considered to limit the amount of signal attenuation in long Ethernet cable runs? (Choose two.) type of media --- number of users type of users length of cable --- type of electrical equipment 11- Which of the following are tests specified by the TIA/EIA-568-B standard for copper cable? (Choose three.) signal harmonics conductive response wire map --- signal absorption insertion loss --- propagation delay --- 12- Which of the following describe amplitude? the height of each wave --- the length of each wave the number of waves each second the amount of time between each wave 13- In a new network installation, the network administrator has decided to use a medium that is not affected by electrical noise. Which cable type will best meet this standard? coaxial screened twisted pair shielded twisted pair unshielded twisted pair fiber optic --- 14- Which of the following are true concerning crosstalk? (Choose three.) FEXT is less of a problem than is NEXT. --- Using frequency step sizes that are larger than those specified by the TIA/EIA standard has no effect on link fault detection. A cable with a NEXT measurement of 30 dB would be considered a better cable than one which has a NEXT measurement of 10 dB. --- NEXT needs to be measured from each pair to each other pair in a UTP link, and from both ends of the link. --- FEXT is determined by injecting a signal into a pair of wires and measuring the signal strength on the other end of the same pair of wire. 15- Which frequencies are used by a cable tester to measure attenuation? the lowest frequencies that the cable is rated to support the highest frequencies that the cable is rated to support --- frequencies from 20 Hz to 20 kHz in 20 Hz increments 10 kHz and 100 GHz 16- Which of the following are true about square waves? (Choose three.) They repeat the same pattern at regular intervals. --- They continuously vary with time. They represent digital signals. --- They do not continuously vary with time. --- They occur naturally and change regularly over time. They represent analog signals. 17- What is the purpose of shielding in copper based media? (Choose two.) protect the data signal from noise generated by electrical signal within the cable --- ground the cable and prevent electrical shocks protect the data signal from external sources of noise --- decrease attenuation and increase the length possible for the cable run ground the cable so that the zero volt reference point is accurate 18- Why are pulses important in digital communication? create the timing mechanism for data transmission determine the value of the data being transmitted --- damage data transmissions signal collisions in data streams 19- Two wires from different wire pairs are connected to the wrong pins on both ends of a cable. What is the wire fault name for this connection? open short split-pair --- transposed-pair 20- Which of the following are detected by the wire map test? (Choose three.) near-end crosstalk (NEXT) opens --- propagation delay return loss reversed-pair faults --- short circuits --- 21- Which one of the following cable tests verifies that all eight wires are connected to the correct pins on both ends of the cable? cable length insertion loss near-end crosstalk (NEXT) propagation delay return loss wire map test --- 22- To ensure reliable LAN communications, what should a technician be looking for when attaching connectors to the ends of UTP cable? that the white-orange/orange pair is attached first that the wire pairs remain twisted as much as possible --- that one end of the shield is properly ground but not the other that 50 ohm termination resistors are on both ends 23- What types of shielding are used in shielded twisted-pair (STP) cable? (Choose two.) insulating material lexan infused braided conductive --- foil-screened --- rubber molding