NetAcad Ch4

Which of the following is the most common network media? -UTP -STP -coaxial

UTP- unshielded twisted pair

true or false? Wireless LANs operate in full-duplex allowing all devices to send or receive data at the same time so the number of users does not impact performance.

false

true or false? Wireless is not well suited for enterprise networks?

false

Which media uses patterns of light to represent bits? -copper -wireless -fiber optic

fiber optic

Whhat PDU is received by the physical layer for encoding and transmission? -frame -segment -packet

frame

What is one advantage of using fiber optic cabling rather than copper cabling? -it is able to carry signals much farther 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 of the following terminates with BNC, N type and F type connectors? -UTP -STP -coaxial

Coaxial

True or false? When a frame is encoded by the physical layer, all bits are sent over the media at the same time.

False

Which standards organization oversees development of wireless LAN standards? -IEEE -TIA -ISO -IANA

IEEE

Which of the following attaches antennas to wireless devices? It can also be bundled with fiber-optic cabling for two-way data transmission. -UTP -STP -coaxial

coaxial

Which of these is the name for the capacity of a medium to carry data? -bandwidth -throughput -goodput

bandwidth

Which of the following wireless standards is used for Personal Area Networks(PANs) and allows devices to communicate over distances of 1 to 100 meters? -zigbee -WiMAX -Wi-Fi -Bluetooth

bluetooth

What is a characteristic of UTP cabling? -immunity to electrical hazards -cladding -woven copper braid or metallic foil -cancellation

cancellation

Which media uses electrical pulses to represent bits? -copper -wireless -fiber optic

copper

Which of the following fiber optic cable types is used within a campus network? -multimode -single mode

multi mode

Which of the following fiber optic cable types use light emitting diodes (LEDs) as a data light source transmitter? -multimode -singlemode

multimode

What type of cable is used to connect a workstation serial port to a Cisco router console port? -coaxial -crossover -straight-through -rollover

rollover

Which of the following fiber optic cable types can travel approximately 100km? -multimode -single mode

single

Which of the following fiber optic cable types use lasers in a single stream as a data light source transmitter? -multimode -single mode

single

Which of the following fiber optic cable types is used to connect long distance telephony and cable TV applications? -multimode -single mode

single mode

What is indicated by the term throughput? -the capacity of a particular medium to carry data -the guaranteed data transfer rate offered by an ISP -the measure of the usable data transferred across the media -the time it takes for a message to get from sender to receiver

the measure of the bits transferred across the media over a given period of time.

What is the purpose of the OSI physical layer? -performing error detection on received frames -exchanging frames between nodes over physical network media -transmitting bits across the local media -controlling access to media

transmitting bits across the local media

Which media uses patterns of microwaves to represent bits? -copper -wireless -fiber optic

wireless

Which type of the following fiber-optic cable types can help data travel approximately 500 meters? -multimode -single mode

-multimode

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 generates the electrical, optical or wireless signals that represent the binary numbers of the frame.

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

What is the definition of bandwidth? -the speed at which bits travel on the network -the speed of bits across the media over a given period of time -the amount of data that can flow from one place to another in a given amount of time -the measure of usable data transferred over a given period of time

-the amount of data that can flow from one place to another in a given amount of time

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 loss of wireless signal over excessive distance from the access point -the weakening of the network signal over long cable lengths

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

A network administrator is designing a new network infrastructure that includes both wired and wireless connectivity. Under which situation would a wireless connection be recommended? -the end user device only has an Ethernet NIC -the end user device area has a high concentration of RFI -the end user device needs mobility when connecting to the network -the end user device requires a dedicated connection because of performance requirements.

-the end user device needs mobility when connecting to the network

Why are two strands of fiber used for a single fiber optic connection? -the two strands allow the data to travel for longer distances without degrading -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

-they allow for full duplex connectivity

Which procedure is used to reduce the effect of crosstalk in copper cables? -wrapping the bundle of wires with metallic shielding -twisting opposing circuit wire pairs together -avoiding sharp bends during installation -designing a cable infrastructure to avoid crosstalk interference -requiring proper grounding connections

-twisting opposing circuit wire pairs together

Which of the following counters EMI and FRI by using shielding techniques and special connectors? -UTP -STP -coaxial

STP- shielded twisted pair

The physical layer of the receiving device passes bits up to which higher level layer? -application -presentation -network -data link

data link

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? -network layer -presentation layer -data link layer -physical layer

physical layer

Which type of UTP cable is used to connect a PC to a switch port? -console -straight through -rollover -crossover

straight through

A wireless LAN is being deployed inside the new one room office that is occupied by the park ranger. The office is located at the highest part of the national park. After network testing is complete, the technicians report that the wireless LAN signal is occasionally affected by some type of interference. What is a possible cause of the signal distortion? -the large number of trees that surround the office -the microwave oven -the number of wireless devices that are used in the wireless LAN -the elevated location where the wireless LAN was installed

the microwave oven

Which of these is the measure of the transfer of bits across the media?

throughput

Which of the following wireless standards is best suited for industrial and IoT environments? -zigbee -WiMAX -Wi-Fi -Bluetooth

zigbee