2.5.7 Practice Questions (TO)

Consider the 850 nm multi-mode fiber optic cable shown below. How much loss can you expect between the transmitter and the receiver?

-1.2dB

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 users workstation located in a cubicle on the second floor. What could cause this to happen?

A strong EMI emitter near the cable run connected to that interface.

What type of polish grade uses green-colored connectors to help you keep from using the wrong connector type?

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?

Angled Physical Contact polish

You manage a network that uses 1000BaseT Ethernet. You find that one device communicates on the network at only 100Mbps. Which tool should you use to test the drop cable and the connection to the network?

Certifier

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 connectors adapters. Which condition are you most likely experiencing?

Echo

You want to measure the voltage, amps and ohms of various devices. Which tool should you use?

Multimeter

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 and 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 multi-mode patch cables. Will this implementation work?

No you shouldn't use multi-mode patch cables with single mode GBIC modules.

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 and 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?

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?

OTDR

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?

Short Circuit

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?

Smart jack

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?

TDR

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? (2)

The cable is functioning correctly & 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 user 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?

Use a cable tester to test the cable between the computer system and the network switch.