Chapter 4

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.

hybrid. (hybrid topology is a variation or combination of a point-to-point, hub and spoke, or mesh topology. This may include a partial mesh or extended star topology.)

Which characteristic describes crosstalk?

the distortion of the transmitted messages from signals carried in adjacent wires*

What is indicated by the term throughput?

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

What are two reasons for physical layer protocols to use frame encoding techniques?

to distinguish data bits from control bits* to identify where the frame starts and ends*

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*

What technique is used with UTP cable to help protect against signal interference from crosstalk?

twisting the wires together into pairs

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.)

coverage area interference security

Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?

data link

What is contained in the trailer of a data-link frame?

error detection

Which method of data transfer allows information to be sent and received at the same time?

full duplex*

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?

EMI RFI

Which statement describes an extended star topology?

End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.

What are two services performed by the data link layer of the OSI model?

It accepts Layer 3 packets and encapsulates them into frames. It accepts Layer 3 packets and encapsulates them into frames.

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

It is able to carry signals much farther than copper cabling.*

What acronym is used to reference the data link sublayer that identifies the network layer protocol encapsulated in the frame?

LLC (Logical Link Control): defines the software processes that provide services to the network layer protocols

What is true concerning physical and logical topologies?

Logical topologies refer to how a network transfers data between devices.

Which type of connector does a network interface card use?

RJ-45

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.

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

They allow for full-duplex connectivity.

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).​

bandwidth