Network Protocol Quiz3

What is the purpose of the OSI physical layer?

• transmitting bits across the local media

• controlling access to media

• performing error detection on received frames

• exchanging frames between nodes over physical network media

Why are two strands of fiber used for a single fiber optic connection?

• They allow for full-duplex connectivity.

• They increase the speed at which the data can travel.

• They prevent crosstalk from causing interference on the connection.

• The two strands allow the data to travel for longer distances without degrading.

Which characteristic describes crosstalk?

• the distortion of the transmitted messages from signals carried in adjacent wires

• the distortion of the network signal from fluorescent lighting

• the weakening of the network signal over long cable lengths

• the loss of wireless signal over excessive distance from the access point

Which procedure is used to reduce the effect of crosstalk in copper cables?

• twisting opposing circuit wire pairs together

• requiring proper grounding connections

• wrapping the bundle of wires with metallic shielding

• designing a cable infrastructure to avoid crosstalk interference

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 throughput? (Choose three.)

• 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

• the bandwidth of the WAN connection to the Internet

• the reliability of the gigabit Ethernet infrastructure of the backbone

What are two characteristics of fiber-optic cable? (Choose two.)

• It is not affected by EMI or RFI.

• It is more expensive than UTP cabling is.

• It typically contains 4 pairs of fiber-optic wires.

• It combines the technique of cancellation, shielding, and twisting to protect data.

• Each pair of cables is wrapped in metallic foil.

What is a primary role of the Physical layer in transmitting data on the network?

• create the signals that represent the bits in each frame on to the media

• provide physical addressing to the devices

• determine the path packets take through the network

• control data access to the media

With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable pairs?

• the magnetic field around the adjacent pairs of wire

• the use of braided wire to shield the adjacent wire pairs

• the reflection of the electrical wave back from the far end of the cable

• the collision caused by two nodes trying to use the media simultaneously

In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.)

• crosstalk

• electromagnetic interference

• bandwidth

• signal modulation technique

• size of the network

Which two devices commonly affect wireless networks? (Choose two.)

• cordless phones

• microwaves

• home theaters

• incandescent light bulbs

• external hard drives