Chapter 2 Section 5
You are building a new network for a small startup financial services company. Security is paramount, so each organization within the company will have their own network segments separated by routers. Funds are limited, and you have been asked to keep costs to a minimum. You have acquired a used fiber optic switch and want to use it to create a fiber optic backbone that interconnects all of the routers. You purchased several used multi-mode GBIC modules on eBay that you will install in each router to allow them to connect to the switch. Both the switch and the GBIC modules use MTRJ connectors. You purchased several used 1-meter multi-mode patch cables from Amazon. But when they arrived, you noticed that they use LC connectors. Fortunately, with some force, you found that you are able to get the LC connectors on the cables to lock into the MTRJ connectors on the GBIC modules and on the switch. Will this implementation work? A) No. You should purchase patch cables that use MTRJ connectors. B) No. You should use single-mode patch cables to connect a GBIC module to a switch. C) Yes. All of the requirements for implementing a fiber optic network have been met. D) No. You should use a specialized backbone fiber optic switch to create a backbone network for routers.
A) No. You should purchase patch cables that use MTRJ connectors.
You are working with an existing fiber optic installation in your building. You want to know the length of each cable that runs through the walls. Which tool should you use? A) OTDR B) Toner probe C) Smartjack D) Multimeter
A) OTDR
Consider the 850 nm multimode fiber optic cable shown below. How much loss can you expect between the transmitter and the receiver? A) -0.3 dB B) -1.2 dB C) -0.6 dB D) -0.9 dB
B) -1.2 dB
While viewing the status of the interfaces on a Cisco switch, you see an abnormally large number of CRC errors on one interface. This interface is connected to a user's workstation located in a cubicle on the second floor. What could cause this to happen? A) Two hosts on the network with the same MAC address. B) A strong EMI emitter near the cable run connected to that interface. C) An incorrect subnet mask configured on the workstation. D) Collisions between two or more network hosts.
B) A strong EMI emitter near the cable run connected to that interface.
You want to measure the voltage, amps, and ohms of various devices . Which tool should you use? A) Certifier B) Multimeter C) Butt set D) Toner probe E) Voltage event recorder
B) Multimeter
You use Cat5e twisted pair cable on your network. Cables are routed through walls and the ceiling. A user puts a screw in the wall to hang a picture and pierces the cable so that a signal sent on pin 1 arrives on the cable connected to pin 7. Which term describes this condition? A) Attenuation B) Short circuit C) Split pair D) Open circuit E) Crosstalk
B) Short circuit
You've connected a cable certifier to an RJ45 wall jack, and the output shown below is displayed on the device. What does this output indicate? (Select two.) A) There are multiple shorts on this cable. B) The cable is functioning correctly. C) This is a crossover cable. D) There are multiple open pins on this cable. E) This is a straight-through cable.
B) The cable is functioning correctly. C) This is a crossover cable.
You are troubleshooting a connectivity problem in which one client system is unable to connect to a server. Both the server and client system are connected to the same Ethernet network switch. No other users have complained of a problem, and you suspect that faulty network cabling might be to blame. Which of the following troubleshooting steps are you most likely to perform first? A) Use a wire crimper to ensure that the cable ends are still fully attached to the cable in two places: between the computer and the network switch, and between the network switch and the server system. B) Use a cable tester to test the cable between the computer system and the network switch. C) Use a cable tester to test the cable between the network switch and the server system. D) Use a punch down tool to test the network cable between the computer system and the network switch. E) Use a tone generator to test the network cables between the computer and the network switch and between the network switch and the server system.
B) Use a cable tester to test the cable between the computer system and the network switch.
Which type of polish grade uses green-colored connectors to help you keep from using the wrong connector type? A) Super Physical Contact (SPC) B) Physical Contact (PC) C) Angled Physical Contact (APC) D) Ultra Physical Contact (UPC)
C) Angled Physical Contact (APC)
You need to replace a fiber optic cable that is connecting two switches together. You inspect the existing fiber cable and determine that it uses LC connectors. You also notice the cable's ferrule has a slight slant to it. Which polish grade should you use to replace the existing cable? A) Physical Contact polish B) Flat Physical Contact polish C) Angled Physical Contact polish D) Ultra Physical Contact polish
C) Angled Physical Contact polish
You have a cable internet connection at home. The installer had connected the router near the outside wall of your house with RG6 cable. You move the cable router a distance of 50 meters using RG8 cables and special connector adapters. Which condition are you most likely to experience? A) NEXT B) FEXT C) Echo D) Attenuation E) EMI
C) Echo
You are building a new network for a small startup financial services company. Security is paramount, so each organization within the company will have its own network segment separated by a router. However, funds are limited, and you have been asked to keep costs to a minimum. You have acquired a used fiber optic switch and want to use it to create a fiber optic backbone that interconnects all of the routers. You purchased several used single-mode GBIC modules on eBay that you will install in each router to allow them to connect to the switch. Both the switch and the GBIC modules use MTRJ connectors. You connect each module to the switch with 1-meter multimode patch cables. Will this implementation work? A) Yes,. All of the requirements for implementing a fiber optic network have been met. B) No. You should not use standard fiber optic switches to create a backbone network for routers. C) No. You shouldn't use multi-mode patch cables with single-mode GBIC modules. D) No. You should purchase fiber optic equipment that use FC connectors.
C) No. You shouldn't use multi-mode patch cables with single-mode GBIC modules.
Users report that the internet is no longer accessible. You suspect that the line connecting your building to the internet is not working properly. Which of the following allows the service provider to remotely test the local loop? A) Demarc extension B) Demarc C) Smartjack D) Horizontal cross connect E) Loopback plug
C) Smartjack
You have been asked to document the wiring in your building. You would like to identify the length of each Cat5 cable to verify that it meets Ethernet standards. You need to identify the length of the cables, but most cables run through walls and ceilings, making them difficult to trace. Which tool should you use? A) Toner probe B) OTDR C) TDR D) Butt set E) Smartjack
C) TDR
You manage a network that uses 1000BaseT Ethernet. You find that one device communicates on the network at only 100 Mbps. Which tool should you use to test the drop cable and the connection to the network? A) Multimeter B) TDR C) Cable tester D) Certifier E) Toner probe
D) Certifier
