Mod4 v1
What are two characteristics of fiber-optic cable?
It is more expensive than traditional
It is not affected by EMI or RFI
Fiber-optic cabling supports higher bandwidth than UTP for longer distances. Fiber is immune to EMI and RFI, but costs more, requires more skill to install, and requires more safety precautions. 4.5 fiber optic cabling
What is the main function of the Physical layer when sending data over a network?
What is, it creates the signals that represent the bits in each frame on to the media.
The OSI physical layer provides the means to transport the bits that make up a frame across the network media. This layer accepts a complete frame from the data link layer and encodes it as a series of signals that are transmitted to the local media. 4.1 purpose of the physical layer
what two factors could interfere with the communication carried over UTP cables?
What is crosstalk and emi
Copper media is widely used in network communications. However, copper media is limited by distance and signal interference. Data is transmitted on copper cables as electrical pulses. The electrical pulses are susceptible to interference from two sources:
Electromagnetic interference (EMI) or radio frequency interference (RFI) - EMI and RFI signals can distort and corrupt the data signals being carried by copper media.
Crosstalk - Crosstalk is a disturbance caused by the electric or magnetic fields of a signal on one wire interfering with the signal in an adjacent wire. 4.3 copper cabling
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
Crosstalk is a type of noise, or interference that occurs when signal transmission on one wire interferes with another wire. When current flows through a wire a magnetic field is produced. The produced magnetic field will interface the signal carried in the adjacent wire. 4.1 UTP cabling
Which two devices commonly affect wireless networks?
What is cordless phones and microwaves
Radio Frequency Interference (RFI) is the interference that is caused by radio transmitters and other devices that are transmitting in the same frequency. 4.6 wireless media
What OSI physical layer term describes the measure of usable data transferred over a given period of time?
What is goodput
4.2 physical layer characteristics
What OSI physical layer term describes the process by which one wave modifies another wave?
What is modulation
4.2 physical layer characteristics
What OSI physical layer term describes the capacity at which a medium can carry data?
What is IEEE
What OSI physical layer term describes the physical medium which uses electrical pulses?
What is copper cable
4.2 physical layer characteristics
What OSI physical layer term describes the capacity at which a medium can carry data?
What is bandwidth
4.2 Physical layer characteristics
What OSI physical layer term describes the measure of the transfer of bits across a medium over a given period of time?
What is throughput
4.2 physical layer characteristics
What is the term used in the OSI Physical layer to describe a physical medium that utilizes the transmission of light?
what is fiber optic cable
4.2 physical layer characteristics
What OSI physical layer term describes the amount of time, including delays, for data to travel from one point to another?
What is latency
4.2 physical layer characteristics
What OSI physical layer term describes the amount of time, including delays, for data to travel from one point to another?
What is latency
4.2 physical layer characteristics
What OSI physical layer term describes the physical medium for microwave transmissions?
What is air
4.2 physical layer characteristics