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
