CCNA Chapter 4
Terms in this set (31)
to distinguish data bits from control bits*
to identify where the frame starts and ends*
What are two reasons for physical layer protocols to use frame encoding techniques? (Choose two.)
the measure of the bits transferred across the media over a given period of time*
What is indicated by the term throughput?
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.)
the distortion of the transmitted messages from signals carried in adjacent wires*
Which characteristic describes crosstalk?
twisting the wires together into pairs*
What technique is used with UTP cable to help protect against signal interference from crosstalk?
The untwisted length of each wire is too long.*
Refer to the exhibit. What is wrong with the displayed termination?
Which type of connector does a network interface card use?
It is able to carry signals much farther than copper cabling.
What is one advantage of using fiber optic cabling rather than copper cabling?
They allow for full-duplex connectivity.*
Why are two strands of fiber used for a single fiber optic connection?
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.)
Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?
It accepts Layer 3 packets and encapsulates them into frames. *
It provides media access control and performs error detection.*
What are two services performed by the data link layer of the OSI model? (Choose two.)
Logical topologies refer to how a network transfers data between devices.*
What is true concerning physical and logical topologies?
Which method of data transfer allows information to be sent and received at the same time?
End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.*
Which statement describes an extended star topology?
Network 1 uses CSMA/CD and Network 3 uses CSMA/CA.*
Refer to the exhibit. Which statement describes the media access control methods that are used by the networks in the exhibit?
What is contained in the trailer of a data-link frame?
The transmitting node inserts start and stop bits into the frame.*
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?
to mark frames to identify the network layer protocol being carried*
What is a role of the Logical Link Control sublayer?
the amount of data that can flow from one place to another in a given amount of time*
What is the definition of bandwidth?
to verify the integrity of the received frame*
What is the function of the CRC value that is found in the FCS field of a frame?
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?
laser as light source
single mode fiber
generally used for campus backbone*
single mode fiber
only one ray of light into the fiber*
single mode fiber
LED as light source*
several paths of light into the fiber*
generally used with LANs*
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
What are two examples of hybrid topologies? (Choose two.)
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