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 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