Module 4 Test Questions

What OSI physical layer term describes the physical medium for microwave transmissions?

Air (pg. 12)

Which situation use Fiber Optic cables? Backbone cabling in an enterprise Guest access in a coffee shop Horizontal cabling structure Waiting rooms in a hospital Desktop PCs in an enterprise office Long-haul networks

Backbone cabling in an enterprise Long-haul networks (pg. 44)

What do you need a rollover UTP cable for?

Configuration (pg. 30)

What do you use a crossover UTP cable for?

Connecting like devices. (pg. 30)

What do you use a straight-through UTP cable for?

Connecting switch to router, connecting unlike devices on a network. (pg. 30)

What OSI physical layer term describes the physical medium which uses electrical pulses?

Copper cable (pg. 12)

Which two devices commonly affect wireless networks? Blu-ray players Home theaters Cordless phones Microwaves Incandescent light bulbs External hard drives

Cordless phones Microwave (pg. 29)

In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? Crosstalk Bandwidth Size of the network Signal modulation technique Electromagnetic interference

Crosstalk Electromagnetic interference (pg. 22)

What is cancellation crosstalk?

Each wire in a pair of wires uses opposite polarity. One wire is negative, the other wire is positive. They are twisted together and the magnetic fields effectively cancel each other and outside EMI/RFI. (pg. 25)

Which cable is made of glass and has a straight tip connector?

Fiber (ST) (pg. 45)

What OSI physical layer term describes the physical medium that uses the propagation of light?

Fiber Optic cable (pg. 12)

What makes fiber preferable to copper cabling for interconnecting buildings? (choose three) Greater distances per cable run Lower installation cost Limited susceptibility to EMI/RFI Durable connections Greater bandwidth potential Easily terminated

Greater distances per cable run Limited susceptibility to EMI/RFI Greater bandwidth potential (pg. 31)

Which situation use wireless? Backbone cabling in an enterprise Guest access in a coffee shop Horizontal cabling structure Waiting rooms in a hospital Desktop PCs in an enterprise office Long-haul networks

Guest access in a coffee shop Waiting room in a hospital (pg. 44)

Which situation use copper cables? Backbone cabling in an enterprise Guest access in a coffee shop Horizontal cabling structure Waiting rooms in a hospital Desktop PCs in an enterprise office Long-haul networks

Horizontal cabling structure Desktop PCs in an enterprise office (pg. 44)

What two characteristics of fiber-optic cable? (choose two) It is not affected by EMI or RFI Each pair of cables is wrapped in metallic foil It combines the technique of cancellation, shielding, and twisting to protect data It typically contains 4 pairs of fiber-optic wires It is more expensive than UTP cabling is

It is not affected by EMI or RFI It is more expensive than UTP cabling is (pg. 39)

What is Modulation?

One wave to modify another wave. (pg. 24)

A network administrator is measuring the transfer of bits across the company backbone for a mission critical financial application. The administrator notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in through put? The amount of traffic that is currently crossing the network The sophistication of the encapsulation method applied to the data The type of traffic that is crossing the network The bandwidth of the WAN connection to the internet The reliability of the gigabit Ethernet infrastructure of the backbone

The amount of traffic that is currently crossing the network The type of traffic that is crossing the network The latency that is created by the number of network devices that the data is crossing (pg. 15)

What is bandwidth?

The capacity at which a medium can carry data. (pg. 13)

What is attenuation?

The longer the electrical signals have to travel, the weaker they get. (pg. 17)

what is throughput?

The measure of the transfer of bits across the media over a given period of time. (pg. 14)

What is the primary role of the physical layer?

To transport bits across the network media using copper, fiber optics, or wireless. (pg. 5)

Which cable is made of copper and has several twisted pairs without any shielding?

UTP (unshielded twisted pair) (pg. 46)

When terminating UTP cables, does the jacket have to be terminated in the housing connector?

Yes, the jacket needs to be in the termination housing of the RJ-45 connector. (pg. 27)