CCNA第一学期Final_exam考试英文版答案RS50A.docx

1、1 What is a characteristic of a fault tolerant network?a network that protects confidential information from unauthorized accessa network that can expand quickly to support new users and applications without impacting the performance of the service delivered to existing usersa network that supports

2、a mechanism for managing congestion and ensuring reliable delivery of content to all usersa network that recovers quickly when a failure occurs and depends on redundancy to limit the impact of a failure2 Three bank employees are using the corporate network. The first employee uses a web browser to v

3、iew a company web page in order to read some announcements. The second employee accesses the corporate database to perform some financial transactions. The third employee participates in an important live audio conference with other corporate managers in branch offices. If QoS is implemented on this

4、 network, what will be the priorities from highest to lowest of the different data types?audio conference, financial transactions, web pagefinancial transactions, web page, audio conferenceaudio conference, web page, financial transactionsfinancial transactions, audio conference, web page3 What is a

5、 benefit of using cloud computing in networking?End users have the freedom to use personal tools to access information and communicate across a business network.Network capabilities are extended without requiring investment in new infrastructure, personnel, or software.Technology is integrated into

6、every-day appliances allowing them to interconnect with other devices, making them more smart or automated.Home networking uses existing electrical wiring to connect devices to the network wherever there is an electrical outlet, saving the cost of installing data cables.4 What is the function of the

7、 shell in an OS?It interacts with the device hardware.It interfaces between the users and the kernel.It provides dedicated firewall services.It provides the intrusion protection services for the device.5 Which connection provides a secure CLI session with encryption to a Cisco switch?a console conne

8、ctionan AUX connectiona Telnet connectionan SSH connection6 A network technician is attempting to configure an interface by entering the following command: SanJose(config)# ip address 192.168.2.1 255.255.255.0. The command is rejected by the device. What is the reason for this?The command is being e

9、ntered from the wrong mode of operation.The command syntax is wrong.The subnet mask information is incorrect.The interface is shutdown and must be enabled before the switch will accept the IP address.7 An administrator uses the Ctrl-Shift-6 key combination on a switch after issuing the pingcommand.

10、What is the purpose of using these keystrokes?to restart the ping processto interrupt the ping processto exit to a different configuration modeto allow the user to complete the command8Refer to the exhibit. A network administrator is configuring access control to switch SW1. If the administrator use

11、s a console connection to connect to the switch, which password is needed to access user EXEC mode?letmeinsecretinlineconinlinevtyin9 On which switch interface would an administrator configure an IP address so that the switch can be managed remotely?FastEthernet0/1VLAN 1vty 0console 010 What protoco

12、l is responsible for controlling the size of segments and the rate at which segments are exchanged between a web client and a web server?TCPIPHTTPEthernet11 What is an advantage to using a protocol that is defined by an open standard?A company can monopolize the market.The protocol can only be run o

13、n equipment from a specific vendor.An open standard protocol is not controlled or regulated by standards organizations.It encourages competition and promotes choices.12 What are two benefits of using a layered network model? (Choose two.)It assists in protocol design.It speeds up packet delivery.It

14、prevents designers from creating their own model.It prevents technology in one layer from affecting other layers.It ensures a device at one layer can function at the next higher layer.13 Which two OSI model layers have the same functionality as two layers of the TCP/IP model? (Choose two.)data linkn

15、etworkphysicalsessiontransport14 Which name is assigned to the transport layer PDU?bitsdataframepacketsegment15 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 usa

16、ble. In which layer of the OSI model is the error categorized?presentation layernetwork layerphysical layerdata link layer16 A network administrator is measuring the transfer of bits across the company backbone for a mission critical financial application. The administrator notices that the network

17、throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput? (Choose three.)the amount of traffic that is currently crossing the networkthe sophistication of the encapsulation method applied to the datathe type of traffic that is crossing t

18、he networkthe latency that is created by the number of network devices that the data is crossingthe bandwidth of the WAN connection to the Internetthe reliability of the gigabit Ethernet infrastructure of the backbone17 What is a characteristic of UTP cabling?cancellationcladdingimmunity to electric

19、al hazardswoven copper braid or metallic foil18 What are two characteristics of fiber-optic cable? (Choose two.)It is not affected by EMI or RFI.Each pair of cables is wrapped in metallic foil.It combines the technique of cancellation, shielding, and twisting to protect data.It typically contains 4

20、pairs of fiber-optic wires.It is more expensive than UTP cabling is.19 What is a characteristic of the LLC sublayer?It provides the logical addressing required that identifies the device.It provides delimitation of data according to the physical signaling requirements of the medium.It places informa

21、tion in the frame allowing multiple Layer 3 protocols to use the same network interface and media.It defines software processes that provide services to the physical layer.20 A network team is comparing physical WAN topologies for connecting remote sites to a headquarters building. Which topology pr

22、ovides high availability and connects some, but not all, remote sites?meshpartial meshhub and spokepoint-to-point21 What method is used to manage contention-based access on a wireless network?CSMA/CDpriority orderingCSMA/CAtoken passing22 What are the three primary functions provided by Layer 2 data

23、 encapsulation? (Choose three.)error correction through a collision detection methodsession control using port numbersdata link layer addressingplacement and removal of frames from the mediadetection of errors through CRC calculationsdelimiting groups of bits into framesconversion of bits into data

24、signals23 What will a host on an Ethernet network do if it receives a frame with a destination MAC address that does not match its own MAC address?It will discard the frame.It will forward the frame to the next host.It will remove the frame from the media.It will strip off the data-link frame to che

25、ck the destination IP address.24 Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame?cut-through switchingstore-and-forward switchingfragment-free switchingfast-forward switching25Refer to the exhibit. If host A sends an IP pa

26、cket to host B, what will the destination address be in the frame when it leaves host A?DD:DD:DD:DD:DD:DD172.168.10.99CC:CC:CC:CC:CC:CC172.168.10.65BB:BB:BB:BB:BB:BBAA:AA:AA:AA:AA:AA26 What addresses are mapped by ARP?destination MAC address to a destination IPv4 addressdestination IPv4 address to t

27、he source MAC addressdestination IPv4 address to the destination host namedestination MAC address to the source IPv4 address27 What are two services provided by the OSI network layer? (Choose two.)performing error detectionrouting packets toward the destinationencapsulating PDUs from the transport l

28、ayerplacement of frames on the mediacollision detection28 What are two functions of NVRAM? (Choose two.)to store the routing tableto retain contents when power is removedto store the startup configuration fileto contain the running configuration fileto store the ARP table29Refer to the exhibit. What

29、 will be the result of entering this configuration the next time a network administrator connects a console cable to the router and no additional commands have been entered?The administrator will be required to enter Cisco123.The administrator will be required to enter Cisco234.The administrator wil

30、l be required to enter Cisco789.The administrator will be presented with the R1 prompt.30 What is the dotted decimal representation of the IPv4 address 11001011.00000000.01110001.11010011?192.0.2.199198.51.100.201203.0.113.211209.165.201.22331 What are three characteristics of multicast transmission

31、? (Choose three.)The source address of a multicast transmission is in the range of 224.0.0.0 to 224.0.0.255.A single packet can be sent to a group of hosts.Multicast transmission can be used by routers to exchange routing information.Routers will not forward multicast addresses in the range of 224.0

32、.0.0 to 224.0.0.255.Computers use multicast transmission to request IPv4 addresses.Multicast messages map lower layer addresses to upper layer addresses.32 What are the three ranges of IP addresses that are reserved for internal private use? (Choose three.)10.0.0.0/864.100.0.0/14127.16.0.0/12172.16.0.0/12192.31.7.0/24192.168.0.0/1633 What purpose does NAT64 serve in IPv6?