CCNA路由协议和概念第8单元.docx

1、CCNA路由协议和概念第8单元1窗体顶端Which OSI layer is responsible for binary transmission, cable specification, and physical aspects of network communication? Presentation Transport Data Link Physical 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 40 points for any other option 2This

2、 item references content from the following areas: CCNA Exploration: Network Fundamentals 8.1.1 Physical Layer - Purpose 2窗体顶端An installed fiber run can be checked for faults, integrity, and the performance of the media by using what device? light injector OTDR TDR multimeter 窗体底端ObservableDescripti

3、onMax Value1correctness of response2 points for Option 20 points for any other option 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.8 Media Connectors 3窗体顶端Which characteristics describe fiber optic cable? (Choose two.) It is not affected by EMI o

4、r RFI. Each pair of cables is wrapped in metallic foil. It combines the technique of cancellation, shielding and twisting to protect data. It has a maximum speed of 100 Mbps. It is the most expensive type of LAN cabling. 窗体底端ObservableDescriptionMax Value1correctness of responseOption 1 and Option 5

5、 are correct.1 point for each correct option.0 points if more options are selected than required. 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.6 Fiber Media 4窗体顶端When is a straight-through cable used in a network? when connecting a router through

6、 the console port when connecting one switch to another switch when connecting a host to a switch when connecting a router to another router 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 30 points for any other option 2This item references content from the following a

7、reas: CCNA Exploration: Network Fundamentals 8.3.3 Unshielded Twisted Pair (UTP) Cable 5窗体顶端Refer to the exhibit. Which type of Category 5 cable is used to make an Ethernet connection between Host A and Host B? coax cable rollover cable crossover cable straight-through cable 窗体底端ObservableDescriptio

8、nMax Value1correctness of response2 points for Option 30 points for any other option 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.3 Unshielded Twisted Pair (UTP) Cable 6窗体顶端Which method of signal transmission uses radio waves to carry signals? el

9、ectrical optical wireless acoustic 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 30 points for any other option 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.7 Wireless Media 7窗体顶端In most business LANs, which connec

10、tor is used with twisted-pair networking cable? BNC RJ-11 RJ-45 Type F 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 30 points for any other option 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.8 Media Connectors 8窗

11、体顶端Which of the following is a characteristic of single-mode fiber-optic cable? generally uses LEDs as the light source relatively larger core with multiple light paths less expensive than multimode generally uses lasers as the light source 窗体底端ObservableDescriptionMax Value1correctness of response2

12、 points for Option 40 points for any other option 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.6 Fiber Media 9窗体顶端Which type of cable run is most often associated with fiber-optic cable? backbone cable horizontal cable patch cable work area cable

13、 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 10 points for any other option 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.6 Fiber Media 10窗体顶端What are three measures of data transfer? (Choose three.) goodput frequ

14、ency amplitude throughput crosstalk bandwidth 窗体底端ObservableDescriptionMax Value1correctness of responseOption 1, Option 4, and Option 6 are correct.1 point for each correct option.0 points if more options are selected than required. 3This item references content from the following areas: CCNA Explo

15、ration: Network Fundamentals 8.2.3 Data Carrying Capacity 11窗体顶端With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable pairs? the magnetic field around the adjacent pairs of wire the use of braided wire to shield the adjacent wire pairs the reflectio

16、n of the electrical wave back from the far end of the cable the collision caused by two nodes trying to use the media simultaneously 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 10 points for any other option 2This item references content from the following areas: CC

17、NA Exploration: Network Fundamentals 8.3.3 Unshielded Twisted Pair (UTP) Cable 12窗体顶端What is a primary role of the Physical layer in transmitting data on the network? create the signals that represent the bits in each frame on to the media provide physical addressing to the devices determine the pat

18、h packets take through the network control data access to the media 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 10 points for any other option 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.1.1 Physical Layer - Purpo

19、se 13窗体顶端In LAN installations where potential electrical hazards or electromagnetic interference may be present, what type of media is recommended for backbone cabling? coax fiber Cat5e UTP Cat6 UTP STP 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 20 points for any o

20、ther option 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.6 Fiber Media 14窗体顶端What is a possible effect of improperly applying a connector to a network cable? Data will be forwarded to the wrong node. Data transmitted through that cable may experi

21、ence signal loss. An improper signaling method will be implemented for data transmitted on that cable. The encoding method for data sent on that cable will change to compensate for the improper connection. 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 20 points for an

22、y other option 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.8 Media Connectors 15窗体顶端Which fiber connector supports full duplex Ethernet? 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 30 points for any other option

23、 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.8 Media Connectors 16窗体顶端What is considered a benefit of wireless as a media choice? more host mobility lower security risks reduced susceptibility to interference less impact of the surroundings on t

24、he effective coverage area 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 10 points for any other option 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.7 Wireless Media 17窗体顶端What characteristic of UTP cable helps red

25、uce the effects of interference? the metal braiding in the shielding the reflective cladding around core the twisting of the wires in the cable the insulating material in the outer jacket 窗体底端ObservableDescriptionMax Value1correctness of response2 points for Option 30 points for any other option 2This item references content from the following areas: CCNA Exploration: Network Fundamentals 8.3.3 Unshielded Twisted Pair (UTP) Cable