Chapter 4 Exam
As data travels on the media in a stream of 1s and 0s how does a receiving node identify the beginning and end of a frame?
The transmitting node inserts start and stop bits into the frame.
The transmitting node sends a beacon to notify that a data frame is attached
The receiving node identifies the beginning of a frame by seeing a physical address.
The transmitting node sends an out-of-band signal to the receiver about the beginning of the frame.
Why are two strands of fiber used for a single fiber optic connection?
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.
The two strands allow the data to travel for longer distances without degrading
What is contained in the trailer of a data-link frame?
Data
Error detection
Physical address
Logical address
Refer to the exhibit. The PC is connected to the console port of the switch. All the other connections are made through FastEthernet links. Which types of UTP cables can be used to connect the devices?
1 – rollover, 2 – crossover, 3 – straight-through
–ª 1 – rollover, 2 – straight-through, 3 – crossover
1 – crossover, 2 – straight-through, 3 – rollover
1 – crossover, 2 – rollover, 3 – straight-through
What is the function of the CRC value that is found in the FCS field of a frame?
To verify the integrity of the received frame
To verify the physical address in the frame
To verify the logical address in the frame
To compute the checksum header for the data field in the frame
Fill in the blank. A physical topology that is a variation or combination of a point-to-point, hub and spoke, or mesh topology is commonly known as a (??)topology.
Which method of data transfer allows information to be sent and received at the same time?
Full duplex
Half duplex
Simplex
Multiplex
Fill in the blank. The term (??)indicates the capacity of a medium to carry data and it is typically measured in kilobits per second (kb/s) or megabits per second (Mb/s).
Fill in the blank. What acronym is used to reference the data link sublayer that identifies the network layer protocol encapsulated in the frame?
A network administrator notices that some newly installed Ethernet cabling is carrying corrupt and distorted data signals. The new cabling was installed in the ceiling close to fluorescent lights and electrical equipment. Which two factors may interfere with the copper cabling and result in signal distortion and data corruption? (Choose two.)
EMI
RFI
Crosstalk
Signal attenuation
Extended length of cabling
Which type of connector does a network interface card use?
RJ-11
PS-2
RJ-45
DIN
What technique is used with UTP cable to help protect against signal interference from crosstalk?
Twisting the wires together into pairs
Wrapping a foil shield around the wire pairs
Encasing the cables within a flexible plastic sheath
Terminating the cable with special grounded connectors
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
Which statement describes an extended star topology?
End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.
End devices are connected together by a bus and each bus connects to a central intermediate device
Each end system is connected to its respective neighbor via an intermediate device
All end and intermediate devices are connected in a chain to each other.
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.
Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?
Application
Transport
Data link
Physical
What are two reasons for physical layer protocols to use frame encoding techniques? (Choose two.)
To reduce the number of collisions on the media
To distinguish data bits from control bits
To provide better media error correction
To identify where the frame starts and ends
To increase the media throughput
A network administrator is designing the layout of a new wireless network. Which three areas of concern should be accounted for when building a wireless network? (Choose three.)
Mobility options
Security
Interference
Coverage area
Extensive cabling
Packet collision
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.
What is indicated by the term throughput?
The guaranteed data transfer rate offered by an ISP
The measure of the bits transferred across the media over a given period of time
The capacity of a particular medium to carry data
The measure of the usable data transferred across the media
The time it takes for a message to get from sender to receiver
Refer to the exhibit. What is wrong with the displayed termination?
The woven copper braid should not have been removed.
The untwisted length of each wire is too long.
The wrong type of connector is being used.
The wires are too thick for the connector that is used.
Laser as light source, generally used for campus backbone, only one ray of light into the fiber
Single-mode fiber
Multimode fiber
LED as light source, several paths of light into the fiber, generally used with LANs
Single-mode fiber
Multimode fiber
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