Mod 30 Physical Layer

What is an important function of the physical layer of the OSI model?

• It accepts frames from the physical media.

• It encapsulates upper layer data into frames.

• It defines the media access method performed by the hardware interface.

• It encodes frames into electrical, optical, or radio wave signals.

A network administrator is troubleshooting connectivity issues on a server. Using a tester, the administrator notices that the signals generated by the server NIC are distorted and not usable. In which layer of the OSI model is the error categorized?

• presentation layer

• network layer

• physical layer

• data link layer

What is the purpose of the OSI physical layer?

• controlling access to media

• transmitting bits across the local media

• performing error detection on received frames

• exchanging frames between nodes over physical network media

Which statement correctly describes frame encoding?

• It uses the characteristic of one wave to modify another wave.

• It transmits data signals along with a clock signal which occurs at evenly spaced time durations.

• It converts bits into a predefined code in order to provide a predictable pattern to help distinguish data bits from control bits.

• It encapsulates upper layer data into frames.

What is one advantage of using fiber-optic cabling rather than copper cabling?

• It is usually cheaper than copper cabling.

• It is able to be installed around sharp bends.

• It is easier to terminate and install than copper cabling.

• It is able to carry signals much farther than copper cabling.

Which pairs of wires change termination order between the 568A and 568B standards?

• green and orange

• blue and brown

• green and brown

• brown and orange

What is the delay in the amount of time for data to travel between two points on a network?

• bandwidth

• throughput

• latency

• goodput

What terms represent the maximum and actual speed that can be utilized by a device to transfer data?

• bandwidth; throughput

• Mbps; Gbps

• throughput; goodput

• goodput; bandwidth

Which type of network cable contains multiple copper wires and uses extra shielding to prevent interference?

• STP

• UTP

• fiber-optic

• coax

What are three options for signal transmission on a network? (Choose three.)

• EMI

• radio waves

• vibration pulses

• electrical pulses

• light pulses