Chapter 4 and 6
What method is used to manage contention-based access on a wireless network? CSMA/CD priority ordering CSMA/CA token passing
CSMA/CA
Which of the following terminates with BNC, N type and F type connectors? UTP STP coaxial
Coaxial
What are the two sublayers of the OSI model data link layer? (Choose two.) internet physical LLC transport MAC network access
LLC MAC
What identifier is used at the data link layer to uniquely identify an Ethernet device? IP address MAC address sequence number TCP port number UDP port number
MAC address
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 prevent crosstalk from causing interference on the connection. They increase the speed at which the data can travel. They allow for full-duplex connectivity.
They allow for full-duplex connectivity.
Which of the following fiber-optic cable types use light emitting diodes (LEDs) as a data light source transmitter? multimode single-mode
multimode
Which media uses electrical pulses to represent bits? copper wireless fiber-optic
copper
Which LAN topology is a hybrid topology? bus extended star ring star
extended star
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. true false
false
True or false. Wireless is not well suited for enterprise networks. true false
false
Which media uses patterns of light to represent bits? copper wireless fiber-optic
fiber-optic
What PDU is received by the physical layer for encoding and transmission? frame segment packet
frame
What type of cable is used to connect a workstation serial port to a Cisco router console port? crossover rollover straight-through coaxial
rollover
What is indicated by the term throughput? the guaranteed data transfer rate offered by an ISP the capacity of a particular medium to carry data the measure of the usable data transferred across the media the measure of the bits transferred across the media over a given period of time 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
Which of these is a measure of the transfer of bits across the media? bandwidth throughput goodput
throughput
What Layer 2 function does a router perform? (Choose three.) Accepts a frame from a medium De-encapsulates the frame Refers to its Layer 3 routing table for a matching destination network Re-encapsulates the packet into a new frame
Accepts a frame from a medium De-encapsulates the frame Re-encapsulates the packet into a new frame
Which data link layer media access control method does Ethernet use? CSMA/CD determinism turn taking token passing
CSMA/CD
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 statement describes the half-duplex mode of data transmission? Data that is transmitted over the network can only flow in one direction. Data that is transmitted over the network flows in one direction at a time. Data that is transmitted over the network flows in one direction to many different destinations simultaneously. Data that is transmitted over the network flows in both directions at the same time.
Data that is transmitted over the network flows in one direction at a time.
Which of the following are data link layer protocols? (Choose three) 802.11 Ethernet IP PPP UDP
Ethernet IP PPP
True or false? The physical layer is only concerned with wired network connections. true false
False
True or false? When a frame is encoded by the physical layer, all bits are sent over the media at the same time. true false
False
Which standards organization oversees development of wireless LAN standards? IANA IEEE ISO TIA
IEEE
Which organization defines standards for the network access layer (i.e., the OSI physical and data link layers)? Cisco IANA IEEE IETF
IEEE IETF
Which two engineering organizations define open standards and protocols that apply to the data link layer? (Choose two.) International Organization for Standardization (ISO) Internet Assigned Numbers Authority (IANA) International Telecommunication Union (ITU) Electronic Industries Alliance (EIA) Internet Society (ISOC)
International Organization for Standardization (ISO) International Telecommunication Union (ITU)
What are two services performed by the data link layer of the OSI model? (Choose two.) It encrypts data packets. It determines the path to forward packets. It accepts Layer 3 packets and encapsulates them into frames. It provides media access control and performs error detection. It monitors the Layer 2 communication by building a MAC address table.
It accepts Layer 3 packets and encapsulates them into frames. It provides media access control and performs error detection.
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 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.
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 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.
It is able to carry signals much farther than copper cabling.
What is another name for the OSI data link layer? Layer 1 Layer 2 Layer 3 Layer 6
Layer 2
Which of the following counters EMI and RFI by using shielding techniques and special connectors? UTP STP coaxial
STP
The IEEE 802 LAN/MAN data link layer consists of which two sublayers? (Choose two.) Network Control Protocol Logical Link Control Media Access Control Link Control Protocol
Logical link control & Media access control
What is true concerning physical and logical topologies? The logical topology is always the same as the physical topology. Physical topologies are concerned with how a network transfers frames. Physical topologies display the IP addressing scheme of each network. Logical topologies refer to how a network transfers data between devices.
Logical topologies refer to how a network transfers data between devices.
What attribute of a NIC would place it at the data link layer of the OSI model? attached Ethernet cable IP address MAC address RJ-45 port TCP/IP protocol stack
MAC address
The media access control method used depends on which two criteria? Layer 3 IP protocol Media sharing Topology Transport layer protocol Type of data
Media sharing Topology
What is the responsibility of the MAC sublayer? Adds Layer 3 addresses to the frame Communicates with the network layer (Layer 3) Provides the method to get the frame on and off the media Transmits the bits on the media
Provides the method to get the frame on and off the media
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 requires a dedicated connection because of performance requirements. The end-user device needs mobility when connecting to the network. The end-user device area has a high concentration of RFI.
The end-user device needs mobility when connecting to the network.
What is the function of the last field in a data link layer frame? To determine whether the frame experienced transmission errors To identify special flow control services such as quality of service (QoS) To identify the beginning and end limits of the frame To identify the Layer 3 protocol in the data field
To determine whether the frame experienced transmission errors
Which of the following is the most common network media? UTP STP coaxial
UTP
What kind of network would use point-to-point, hub and spoke, or mesh topologies? PAN LAN WLAN WAN
WAN
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? cancellation cladding immunity to electrical hazards woven copper braid or metallic foil
cancellation
Which media access control method is used in legacy Ethernet LANs? carrier sense multiple access/collision annoyance carrier sense multiple access/collision avoidance carrier sense multiple access/collision destruction carrier sense multiple access/collision detection
carrier sense multiple access/collision detection
The physical layer of the receiving device passes bits up to which higher level layer? application presentation network data link
data link
Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media? application transport data link physical
data link
Which lists the Layer 2 and Layer 3 address fields in the correct order? destination NIC address, source NIC address, source IP address, destination IP address source NIC address, destination NIC address, source IP address, destination IP address destination NIC address, source NIC address, destination IP address, source IP address source NIC address, destination NIC address, destination IP address, source IP address
destination NIC address, source NIC address, source IP address, destination IP address
What does a router do after de-encapsulating a received frame? determines the best path de-encapsulates the frame re-encapsulates the packet into a new frame forwards the new frame onto the network medium
determines the best path
Which duplex communication method is used in WLANs? full-duplex half-duplex simplex
half-duplex
What does the data link layer add to a Layer 3 packet to create a frame? (Choose two.) flags sequence number header trailer
header trailer
Which topology displays networking device layer IP addresses? aerial topology IP address topology logical topology physical topology
logical topology
A technician has been asked to develop a physical topology for a network that provides a high level of redundancy. Which physical topology requires that every node is attached to every other node on the network? bus hierarchical mesh ring star
mesh
Which of the following fiber-optic cable types can help data travel approximately 1.24 miles or 2 km/2000m? multimode single-mode
multimode
Which of the following fiber-optic cable types is used within a campus network? 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? presentation layer network layer physical layer data link layer
physical layer
Which of the following fiber-optic cable types can travel approximately 62.5 miles or 100 km/100000 m? 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
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
What type of physical topology can be created by connecting all Ethernet cables to a central device? bus ring star mesh
star
Which type of UTP cable is used to connect a PC to a switch port? console rollover crossover straight-through
straight-through
What is the definition of bandwidth? the measure of the transfer of bits across the media over a given period of time the speed at which bits travel on the network 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 network signal from fluorescent lighting the distortion of the transmitted messages from signals carried in adjacent wires the weakening of the network signal over long cable lengths the loss of wireless signal over excessive distance from the access point
the distortion of the transmitted messages from signals carried in adjacent wires
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 are two possible causes of the signal distortion? (Choose two.) the microwave oven the large number of trees that surround the office the cellular phones that are used by the employees the elevated location where the wireless LAN was installed the number of wireless devices that are used in the wireless LAN
the microwave oven the cellular phones that are used by the employees
Although CSMA/CD is still a feature of Ethernet, why is it no longer necessary? the virtually unlimited availability of IPv6 addresses the use of CSMA/CA the use of full-duplex capable Layer 2 switches the development of half-duplex switch operation the use of Gigabit Ethernet speeds
the use of full-duplex capable Layer 2 switches
Which is a function of the Logical Link Control (LLC) sublayer? to define the media access processes that are performed by the hardware to provide data link layer addressing to identify which network layer protocol is being used to accept segments and package them into data units that are called packets
to identify which network layer protocol is being used
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
transmitting bits across the local media
Which procedure is used to reduce the effect of crosstalk in copper cables? requiring proper grounding connections twisting opposing circuit wire pairs together wrapping the bundle of wires with metallic shielding designing a cable infrastructure to avoid crosstalk interference avoiding sharp bends during installation
twisting opposing circuit wire pairs together
Which media uses patterns of microwaves to represent bits? copper wireless fiber-optic
wireless
Which of the following wireless standards is best suited for industrial and IoT environments? Zigbee WiMAX Wi-Fi Bluetooth
zigbee