ccna认证考试真题.pdf

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1、(1)TCP/1P Address i ng and ProtocoI1:Your junior network administrator wantssubnet mask is for a Class C IP address.to know what the defaultWhat do you tell him?A.255.0.0.0B.255.255.0.0C.255.245.255.0D.255.255.255.0E.255.255.255.2552:An application needs to have reliable,end-to-end connect-ivity.Whi

2、ch of the following protocols will give you reliableconnectivity?A.TCPB.UDPC.IPD.ICMP3:You are designing a network,which needs to support 55 users.You dont plan to extend the segment beyond the current number ofusers.Which subnet mask would best meet your needs?A.255.255.0.0B.255.255.255.0C.255.255.

3、255.192D.255.255.255.1604:You have added a new switch to your network.You want to manageit remotely,so you need to assign it an IP address.Your routerthat connects to the switch has an IP address of 172.16.12.33/27.Which of the following addresses can you assign to this switch?A.172.16.12.33/28B.172

4、.16.12.32/27C.172.16.12.33/27D.172.16.12.34/27E.172.16.12.35/28F.172.16.12.38/28G.172.16.12.63/275:The address 172.16.208.16/20 is a host address in which of thefollowing subnets?A.172.16.176.0-255.255.240.0B.172.16.192.0-255.255.240.0C.172.16.208.0-255.255.240.0D.172.16.224.0-255.255.240.06:You are

5、 designing an IP address scheme for your brand new remoteoffice.The vice president of IT calls to tell you that you willbe in charge of the 192.168.1.64/26 subnetwork.This supplies youwith a single subnetwork with 62 hosts.You need to have at leasttwo subnets with 14 hosts in each subnet.What custom

6、 subnet maskshould you use?A.255.255.255.128B.255.255.255.192C.255.255.255.224D.255.255.255.240E.255.255.255.2487:You have subnetted the 210.106.14.0 network with a/24 mask.Yourboss at Acme,Inc.wants to know how many usable subnetworks andusable host addresses per subnet this would provide.What shou

7、ldyou tell her?A.One network with 254 hostsB.Two networks with 128 hostsC.Four networks with 64 hostsD.Six networks with 30 hosts8:Identify three valid host addresses in any subnet of the201.168.27.0 network,assuming a fixed subnet mask of255.255.255.240.(Choose three.)A.201.168.27.33B.201.168.27.11

8、2C.201.168.27.119D.201.168.27.126E.201.168.27.175F.201.168.27.2089:What is the subnetwork address for a host with the IP address201.100.5.68/28?A.201.100.5.0B.201.100.5.32C.201.100.5.64D.201.100.5.65E.201.100.5.31F.201.100.5.110:Which of the following protocols uses a three-way handshakemechanism to

9、 establish sessions?A.TCPB.IPC.UDPD.IPXE.Frame relay11:Which of the following protocols is connection-oriented?A.TCPB.IPC.IPXD.Frame relay12:You are using an application on your Windows 2000 client machinesthat provides error correction.You need a protocol to provide fasttransport.Which protocol sho

10、uld your application use?A.TCPB.IPC.UDPD.SPXE.AppleTalk13:When using TCP,after a session is open,the applications canadjust the number of segments they receive before sending anacknowledgment.This behavior is known as.A.MTU adjustmentB.WindowingC.Flexible Send PathD.FCS14:If the destination did not

11、receive a segment,how will the TCPhost know to resend the information?A.The A CK received will not include the segment number that wasnot received.B.The A CK received will include the segment number that was notreceived.C.The sending host will send a PACK to verify segment receipt.D.The destination

12、host will send a Y A C K message back to the sendinghost.15:You are planning on using a single network that supports 208users.Which IP address class would you choose to be the mostefficient?A.Class AB.Class BC.Class CD.Class DE.Class E16:RFC 1918 defines the private IP address ranges.Which of thefol

13、lowing IP addresses are considered part of these ranges?(Choosethree.)A.10.23.45.67B.126.21.34.56C.172.16.32.1D.172.31.234.55E.192.169.4.517:A new network is being designed for your company,Acme,Inc.If you use a Class C IP network,which subnet mask will provide oneusable subnet per department while

14、allowing enough usable hostaddresses for each department specified in the table?DepartmentNumber of UsersCorporate7Customer Support15Financial13HR7Engineering16A.255.255.255.0B.255.255.255.192C.255.255.255.224D.255.255.255.240E.255.255.255.24818:Which of these protocols provides data transport,relyi

15、ng onthe error correction capabilities of the application itself?A.UDPB.TCPC.SN M PD.ICM P19:Which of the following are used by TCP to ensure reliabledelivery of data?(Choose two.)A.M A C address resolutionB.Sequence numbersC.AcknowledgmentsD.PingE.Routing updates20:You discover that you are able to

16、 adjust the window size of theTCP segment.You increase the window size to test the results.Whatwill you observe happening on your network?A.Increased throughputB.Decreased throughputC.Increased latencyD.Decreased reliability21:Your organization is using the 192.168.1.0/24 address space.You need 28 s

17、ubnets.What subnet mask would you use to create thesesubnets?A.255.255.255.0B.255.255.255.128C.255.255.255.192D.255.255.255.224E.255.255.255.240F.255.255.255.24822:Which of the following protocols maps IP addresses to MACaddresses for connectivity to occur between two hosts?A.ARPB.RARPC.SLARPD.DHCP2

18、3:Your junior network administrator cannot seem to ping a hostin another network and asks you why it isnt working.Which of thefollowing is not an answer that you would give him?A.The host,s default gateway is down.B.The destination host is not powered on.C.The IP address of the router interface is i

19、ncorrect.D.The IP address of the switch to which the destination hostconnects is incorrect.E.The host is in a different subnet.24:Which of the following classes of IP addresses is utilized formulticasting?A.Class AB.Class BC.Class CD.Class D25:You give your IT department a spreadsheet of IP addresse

20、s andtheir subnets.You receive a call from one of the junior techs askingwhat the/26 means next to the IP addresses.You tell her:A.It represents the number of hosts possible on that subnetwork.B.It represents the number of subnetworks that are being used.C.It represents the class of IP address being

21、 used.D.It represents the number of bits in the subnet mask that are 1.26:You are given an IP network of 192.168.5.0 and told that youneed to separate this network into subnetworks that can support amaximum of 16 hosts per subnet.This will help alleviate congestionon the network.What subnet mask can

22、 you use to create the subnetsnecessary to meet the given criteria?A.255.0.0.0B.255.255.0.0C.255.255.255.0D.255.255.255.224E.255.255.255.24027:Which of the following would a Class A network be assigned to?A.Government agencyB.Small-to-medium sized corporationC.SOHOD.An individual28:A client has the

23、IP address 192.168.5.98/27.Which of thefollowing addresses are on the same subnet as this host?(Choosetwo.)A.192.168.5.95B.192.168.5.100C.192.168.5.128D.192.168.5.11029:Which of the following IP addresses is not a public IP addressthat can be routed over the Internet?A.2.3.4.5B.11.12.13.14C.165.23.2

24、24.2D.172.31.45.34E.203.33.45.2230:You are given a Class B network.What is the default subnet maskassigned to the Class B network?A.255.255.255.255B.255.255.0.0C.255.224.0.0D.0.0.0.031:You are troubleshooting your routers interfaces.For somereason,the Ethernet interface will not accept the IP addres

25、s of192.168.5.95/27 that youve assigned.Which of the followingexplains the routers refusal to take the IP address?A.Class C addresses cannot be assigned to Ethernet interfaces.B.The/27 is an invalid mask.C.It is a broadcast address.D.It is a public IP address.E.It is a private IP address.32:You are

26、a network technician at Acme,Inc.You are required todivide the 172.12.0.0 network into subnets.Each subnet must havethe capacity of 458 IP addresses.Also,according to therequirements,you must provide the maximum number of subnets.Whichsubnet mask should you use?A.255.255.255.254B.255.255.254.0C.255.

27、255.240.254D.255.255.0.033:What is the subnetwork and broadcast IP address of 192.168.2.37with the subnet mask of 255.255.255.248?A.192.168.2.24/192.168.2.31B.192.168.2.32/192.168.2.39C.192.168.2.40/192.168.2.47D.192.168.2.48/192.168.2.55E.192.168.2.56/192.168.2.6334:One of your co-workers at Acme,I

28、nc.,needs to convert the binarynumber 11011010 into a decimal.What is the decimal equivalent?A.218B.219C.220D.221E.22235:One of your co-workers at Acme,Inc.,needs to convert the binarynumber 01011010 into a decimal.What is the decimal equivalent?A.75B.83C.90D.9736:One of your co-workers at Acme,Inc.

29、,needs to convert the binarynumber 11010110 into a decimal.What is the decimal equivalent?A.198B.214C.252D.25537:One of your co-workers at Acme,Inc.,needs to convert the binarynumber 10110110 into a decimal.What is the decimal equivalent?A.182B.192C.202D.21238:You are configuring a subnet for the Ac

30、me,Inc.,branch officein Beijing.You need to assign IP addresses to hosts in this subnet.You have been given the subnet mask of 255.255.255.224.Which ofthese IP addresses would be valid?(Choose three.)A.15.234.118.63B.92.11.178.93C.134.178.18.56D.192.168.16.87E.201.45.116.159F.217.63.12.19239:You are

31、 a network technician at Acme,Inc.You have subnettedthe 208.98.112.0 network with a/28 mask.Your boss asks you howmany usable subnetworks and usable host addresses per subnet thiswill provide.What should you tell her,assuming your router is usingip subnet-zero?A.62 networks and 2 hostsB.6 networks a

32、nd 30 hostsC.8 networks and 32 hostsD.16 networks and 16 hostsE.16 networks and 14 hosts40:What is a disadvantage of using a connection-oriented protocolsuch as TCP?A.Packet acknowledgment might add overhead.B.Packets are not tagged with sequence numbers.C.Loss or duplication of data packets is more

33、 likely to occur.D.The application layer must assume responsibility for the correctsequencing of the data packets.41:You are a network technician at Acme,Inc.You have subnettedthe 192.168.72.0 network with a/30 mask for connections betweenyour routers.Your boss asks you how many usable subnetworks a

34、ndusable host addresses per subnet this will provide.What should youtell her,assuming your router cannot use ip subnet-zero?A.62 networks and 2 hostsB.6 networks and 30 hostsC.8 networks and 32 hostsD.16 networks and 16 hostsE.14 networks and 14 hosts42:Which of the following IP addresses are consid

35、ered“network”addresses with a/26 prefix?(Choose two.)A.165.203.2.0B.165.203.5.192C.165.203.6.63D.165.203.6.191E.165.203.8.25543:Identify three valid hosts in any subnet of 192.168.32.0,assuming the subnet mask used is 255.255.255.240.(Choose th ree.)A.192.168.32.33B.192.168.32.112C.192.168.32.119D.1

36、92.168.32.126E.192.168.32.175F.192.168.32.20844:A Class C network address has been subnetted with a/27 mask.Which of the following addresses is a broadcast address for one ofthe resulting subnets?A.198.57.78.33B.198.57.78.64C.198.57.78.97D.198.57.78.97E.198.57.78.159F.198.57.78.25445:What is the sub

37、network address for a host with IP address165.100.5.68/28?A.165.100.5.0B.165.100.5.32C.165.100.5.64D.165.100.5.65E.165.100.5.31F.165.100.5.146:Your boss wants to know what TCP stands for.What dohim?A.Transmission Check ProtocolB.Transport Check ProtocolC.Transmission Control Protocolyou tellD.Transp

38、ort Control Protocol47:Your boss wants to know what UDP stands for.What do you tellhim?A.Unreliable Data ProtocolB.Unreliable Data ProgramC.User-Defined ProtocolD.User Datagram Protocol48:Which of the following statements accurately describes UDP?A.UDP copies files between a computer and a system ru

39、nning rshd,the remote shell service(daemon).B.UDP is a member of the TCP/IP suite of protocols that governsthe exchange of electronic mail between message transfer agents.C.UDP is a member of the TCP/IP suite of protocols and is used tocopy files between two computers on the Internet.Both computersm

40、ust support their respective roles:one must be a client,and theother a server.D.UDP is a TCP complement that offers a connectionless datagramservice guaranteeing neither delivery nor correct sequencing ofdelivered packets(much like IP).49:Which of the following host addresses are members of networks

41、that can be routed across the public Internet?(Choose three.)A.10.20.12.64B.172.16.32.129C.172.64.32.34D.192.168.23.252E.196.104.12.95F.214.192.48.25450:You are connecting your Serial 0/1 interface to the Internet.Which of the following need to be done for the connection to work?(Choose two.)A.Assig

42、n a public IP address.B.Use the shutdown command.C.Use the no shutdown command.D.Make sure the interface is running in full-duplex.(2)Basic IOS Configuration1:In which of the following modes in Cisco,s IOS can you issue showcommands?(Choose two.)A.UserB.PrivilegedC.Line ConfigurationD.Global Configu

43、ration2:Yo u are the network administrator for a large corporation.Youwant to be able to store all your configurations in a centralizedlocation.Which of these servers will allow you to do so?(Choosetwo.)A.FTPB.TFTPC.SQLD.Oracle3:You need to troubleshoot your network IP connectivity.Which ofthe follo

44、wing commands would you use to find the IP address on yourEthernet 0 interface?A.pingB.IPConfigC.tracerouteD.Show interface Ethernet 04:Which command would you use at the CLI in User mode to enterPrivileged EXEC mode?A.PrivilegeB.AdminC.EnableD.Disable5:You have just received 14 Catalyst switches fo

45、r your network.You would like to install these switches into your productionnetwork to provide separate collision domains for each of theconnected devices.What configuration is required to provide thisfunctionality?A.No configuration is required.B.You must set up an IP address on the switch.C.You mu

46、st configure unique VLANs on the switches.D.You must install the Cisco IOS.6:Which of the following prompts indicates your router is inPrivileged EXEC mode?A.RouterB.Router#C.Router&D.Router$7:You have made a console connection to your Cisco Catalyst switchand you see the symbol in HyperTerminal.Wha

47、t does it mean?A.You are in Privileged EXEC mode.B.You are in User EXEC mode.C.The switch has not been configured.D.The switch is in need of repairs.8:You would like to assign a meaningful name to your Catalyst switch.What command should you use?A.enableB.host nameC.hostnameD.name9:You need to assig

48、n an IP address to your Catalyst 2950 switch.You are at the HQ_SW1 prompt.What is the correct series of commands?(cr=carriage return)A.enable ip address 10.1.1.1B.enable ip address 10.1.1.1 255.255.255.0C.enable configure terminal ip address 10.1.1.1255.255.255.0D.enable configure terminal interface

49、 vlan 1 ipaddress 10.1.1.1 255.255.255.010:Which of the following commands displays the syntax for the clockcommand?A.cl?B.clock?C.clock?D.cl?11:Which of the following commands allows you to configure awelcoming message whenever you log in to a router?A.Router(config)#banner messageB.Router(config)#

50、banner motd&C.Router#banner motd#D.Router#banner message!12:You need to connect to your 2621XM router to configure aninterface.Which of the following methods allows you to connect toand issue commands on the router?(Choose three.)A.TelnetB.FTPC.Console connectionD.AUX connection13:You want to preven