cisco chapter 4 midterm

True or false? The physical layer is only concerned with wired network connections.

false

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 media uses patterns of light to represent bits? -copper -wireless -fiberoptic

fiberoptic

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

frame

Which statement correctly describes frame encoding?

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

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

it is able to carry signals much further than copper cabling

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

IEEE

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

STP

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 -wifi -bluetooth

bluetooth

What is a characteristic of UTP cabling? -cancellation -cladding

cancellation

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 the following terminates with BNC, N type and F type connectors? -UTP -STP -coaxial

coaxial

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

copper

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

multimode

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

multimode

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

rollover

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

single mode

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 the definition of bandwidth?

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

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 needs mobility when connecting to the network

What is indicated by the term throughput?

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

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

they allow for full duplex activity

Which of these is a measure of the transfer of bits across the media? -bandwidth -throughput -goodput

throughput

What is the purpose of the OSI physical layer?

transmitting bits across the local media

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

twisting opposing circuit wire pairs together

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

wireless

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

UTP

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

data link

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

multimode

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

physical layer

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

single mode

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 microwave oven

Which of the following wireless standards is best suited for industrial and IoT environments? -zigbee -wiMAX -wifi -bluetooth

zigbee