CCNA十一章答案
思科认证CCNA认证试题和答案中文版
思科认证CCNA认证试题和答案中文版思科认证CCNA认证试题和答案中文版想要获得思科认证，首先要参加由思科推荐并授权的培训中心(Cisco Training Partner，简称CTP)所开设的培训课程。
完成学业后再到由全球考试机构Sylvan Prometric授权的.考试中心参加由思科指定的科目的认证考试。
通过指定的系列科目考试后，学员就可以获得相应分支系列等级的资格认证。
下面是店铺为大家搜集的相关试题，供大家参考练习。
16、路由器A串口0配置如下interface serial0link-protocol pppppp pap local-user huawei password simple quidwayip address 2.2.2.1 255.0.0.0路由器B串口及全局配置如下local-user huawei service-type ppp password simple quidway!interface serial0link-protocol pppppp authentication-mode papip address 2.2.2.2 255.0.0.0当两台路由器串口0相连时，两台路由器是否可以连接到对端()(A) 能(B) 不能答案：A17、关于千兆以太网，以下说法正确的是( )(A) IEEE802.3ab定义了千兆以太网(B) 在同一冲突域中，千兆以太网不允许中继器的互连(C) IEEE802.3z专门定义了千兆以太网在双绞线上的传输标准(D) 千兆以太网支持网络速率的自适应，可以与快速以太网自动协商传输速率答案：AB参考知识点：华为3com认证教材第一册3-8页18、高层的协议将数据传递到网络层后，形成( )，而后传送到数据链路层(A) 数据帧(B) 信元(C) 数据包(D) 数据段答案：C参考知识点：华为3com认证教材第一册1-20页19、在路由器上配置帧中继静态map必须指定( )参数(A) 本地的DLCI(B) 对端的DLCI(C) 本地的协议地址(D) 对端的协议地址答案：AD20、路由器的主要性能指标不包括( )(A) 延迟(B) 流通量(C) 帧丢失率(D) 语音数据压缩比答案：D【思科认证CCNA认证试题和答案中文版】。
完整版CCNA测试题库及答案
完整版CCNA测试题库及答案描述载波侦听多路由访问/冲突检测（CSMA/CD）的工作原理。
CSMA/CD是一种帮助设备均衡共享带宽的协议，可避免两台设备同时在网络介质上传输数据。
虽然他不能消除冲突，但有助于极大的减少冲突，进而避免重传，从而提高所的设备的数据传输效率。
区分半双工和全双工通信。
并指出两种方法的需求。
与半双工以太网使用一对导线不同，全双工以太网使用两队导线，全双工使用不同的导线来消除冲突，从而允许同时发送和接收数据，而半双工可接收或发送数据，但不能同时接收和发送数据，且仍会出现冲突。
要使用全双工，电缆两端的设备都必须支持全双工，并配置成一全双模式运行。
描述MAC地址的组成部分以及各部分包含的信息。
MAC（硬件）地址时一种使用十六进制表示的地址，长48位（6B）。
其中前24位（3B）称为OUI（Organizationally Unique Idebtifier,组织唯一表示符），有IEEE分配给NIC制造商；余下的部分呢唯一地标识了NIC识别十进制数对应的二进制值和十六进制值。
用这三种格式之一表示的任何数字都可以转换为其他两种格式，能够执行这种转换对理解IP地址和子网划分至关重要。
识别以太网帧中与数据链路层相关的字段。
在以太网中，与数据链路层相关的字段包括前导码，帧其实位置分隔符，目标MAC地址，源MAC地址，长度或者类型以及帧校验序列。
识别以太网布线相关的IEEE标准。
这些标准描述了各种电缆类型的功能和物理特征，包括（但不限于）10Base2、10Base5和10BaseT。
区分以太网电缆类型及其用途。
以太网电缆分3种：直通电缆，用于将PC或路由器的以太网接口连接到集线器或交换机；交叉电缆。
用于将集线器连接到集线器，集线器连接到交换机，交换机连接到交换机以及PC连接到PC；反转电缆，用于PC和路由器或交换机之间建立控制台连接。
描述数据封装过程及其在分组创建中的作用。
数据封装指的是在OSI模型各层给数据添加信息的过程，也成为分组创建。
CCNA认证基础课程-课后作业.习题答案
CCNA认证基础-习题分析讲义第一部分第一章1. Convert the binary number 10111010 into its hexadecimal equivalent. Select thecorrect answer from the list below. （3）1) 852) 903) BA4) A15) B36) 1C2. Convert the Hexadecimal number A2 into its Base 10 equivalent. Select thecorrect answer from the list below. （4）1) 1562) 1583) 1604) 1625) 1646) 1663. Which binary number is a representation of the decimal number 248? （3）1) 111010002) 111101003) 111110004) 111110104. Which of the following will test the internal loopback of a node? （3）1) ping 10.10.10.12) ping 192.168.1.13) ping 127.0.0.14) ping 223.223.223.2235) ping 255.255.255.2555. What can be verified by successfully pinging the reserved loopback address ona host? （2）1) Connectivity exists between two hosts on the LAN.2) The TCP/IP stack of the local host is configured correctly.3) A connection exists between a host and the default gateway.4) The route a packet takes from the local host to a remote host is valid.6. Which of the following commands could be used on a Windows-basedcomputer to view the current IP configuration of the system? (Choose two.) （3，4）1) configip2) ifconfig3) ipconfig4) winipcfg5) Winipconfig7.Refer to the exhibit. What must be configured on Host B to allow it to communicate withthe Host C? (Choose three.) （2，4，6）1)the MAC address of RTA router interface connected to Switch 12) a unique host IP address3)the IP address of Switch 14)the default gateway address5)the MAC address of Host C6)the subnet mask for the LAN8. What are important characteristics to consider when purchasing a networkinterface card? (Choose two.) （2，3）1) security used on the network2) media used on the network3) system bus used on the computer4) software installed on the network5) diagnostic tools installed on the network第二章1. Select the necessary information that is required to compute the estimated timeit would take to transfer data from one location to another. (Choose two.) （1，5）1) file size2) data format3) network in use4) type of medium5) bandwidth of the link2. Using the data transfer calculation T=S/BW, how long would it take a 4MB file tobe sent over a 1.5Mbps connection? （2）1) 52.2 seconds2) 21.3 seconds3) 6.4 seconds4) 2 seconds5) 0.075 seconds6) 0.0375 seconds3. What are features of the TCP/IP Transport layer? (Choose two.) （3，5）1) path determination2) handles representation, encoding and dialog control3) uses TCP and UDP protocols4) packet switching5) reliability, flow control and error correction4. Which of the following is the Layer 4 PDU? （4）1) bit2) frame3) packet4) Segment5. What is important to remember about the data link layer of the OSI model whenconsidering Peer to Peer communication? (Choose three.) （3，4，5）1) It links data to the transport layer.2) It encapsulates frames into packets.3) It provides a service to the network layer.4) It encapsulates the network layer information into a frame.5) Its header contains a physical address which is required to complete the datalink functions.6) It encodes the data link frame into a pattern of 1s and 0s (bits) for transmissionon the medium.6. Which statement describes a star topology? （2）1) Each host in the network is connected to a backbone cable that is terminated atboth ends.2) Each host is connected to a hub or switch, either of which acts as a central pointfor all network connections.3) Each host is directly connected to two other hosts to form a long chain of hosts.4) Each host has a connection to all other hosts in the network.7. Which statements describe the logical token-passing topology? (Choose two.)（2）1) Network usage is on a first come, first serve basis.2) Computers are allowed to transmit data only when they possess a token.3) Data from a host is received by all other hosts. Electronic tokens are passedsequentially to each other.4) Token passing networks have problems with high collision rates.8. Which technologies are considered to be LAN technologies? (Choose two.) （2，5）1) DSL2) Token Ring3) Frame Relay4) ISDN5) Ethernet9.Refer to the exhibit. Host A wants to send a message to host B. Place the following stepsin the correct order so that the message can be sent. （4）A - add network layer addressesB - transmit bitsC - create application dataD - add data link layer addresses1) B, A, D, C2) D, A, C, B3) A, D, A, B4) C, A, D, B5) C, D, A, B6) C, B, A, D10.After an uns u ccessful ping to the local router, the technician decides to investigate therouter. The technician observes that the lights and fan on the router are not operational.In which layer of the OSI model is the problem most likely occurring? （4）1) transport2) network3) data link4) physical11. Refer t o the exhibit. What is the order of the TCP/IP Protocol Data Units as datais moved as indicated through the OSI model? （3）1) data, segments, frames, packets, bits2) data, packets, segments, frames, bits3) data, segments, packets, frames, bits4) data, packets, frames, segments, bits第三章1. Which combinations of charges will be repelled by electric force? (Choose two.)（4，6）1) neutral and neutral2) neutral and positive3) neutral and negative4) positive and positive5) positive and negative6) negative and negative2. Which of the following are considered the best media for use in data networkcommunications? (Choose three.) （2，3，6）1) glass2) fibers3) copper4) gold5) plastic6) silicon7) Silver3. Which of the following wireless standards increased transmission capabilitiesto 11 Mbps? （2）1) 802.11a2) 802.11b3) 802.11c4) 802.11d4. What is attenuation? （3）1) opposition to the flow of current2) measurement of electrical signals relative to time3) degradation of a signal as it travels along the medium4) amount or volume of traffic that is flowing on the medium5. Which cable specifications are indicated by 10BASE-T? （3）1) 10 Mbps transmission speed, baseband signal, 500 meter cable length, coaxialcable2) 10 Mbps transmission speed, broadband signal, 100 meter cable length, coaxialcable3) 10 Mbps transmission speed, baseband signal, 100 meter cable length,twisted-pair cable4) 10 Gbps transmission speed, broadband signal, 500 meter cable length,twisted-pair cable6. For which Ethernet installations would fiber optic rather than Cat5 UTP be abetter media choice? (Choose two.) （2，4）1) a 3 meter connection between two 10BASE-T hubs2) an environment with many potential sources of EMI and RFI3) a peer to peer connection between two NICs with RJ45 connectors4) an installation between two buildings that are located 500 meters apart5) a single building installation where installation costs are the major concern7. Refer to the exhibit. Which type of UTP cable should be used to connect Host Ato Switch1? （4）1) rollover2) console3) crossover4) straight-through8. Refer to the exhibit. Which type of Category 5 cable is used to make an Ethernetconnection between Host A and Host B? （3）1) coax cable2) rollover cable3) crossover cable4) straight-through cable第四章1. During cable testing, which of the following are used to calculate theinformation carrying capacity of a data cable? (Choose two.) （2，5）1) bit speed2) attenuation3) wire map4) saturation limit5) analog bandwidth2. What type of wiring problem is depicted in this sample of a cable tester? （3）1) a fault2) a short3) an open4) a split a good map3. In a new network installation, the network administrator has decided to use amedium that is not affected by electrical noise. Which cable type will best meet this standard? （5）1) coaxial2) screened twisted pair3) shielded twisted pair4) unshielded twisted pair5) fiber optic4. How does network cable length affect attenuation? （3）1) Category 5 cable that is run in metal conduit has the highest attenuation in theshortest distance.2) Shorter cable lengths have greater signal attenuation.3) Longer cable lengths have greater signal attenuation.4) The length of the cable has no effect on signal attenuation.第五章1. The highest capacity Ethernet technologies should be implemented in whichareas of a network? (Choose three.) （3，4，5）1) between workstation and backbone switch2) between individual workstations3) between backbone switches4) between enterprise server and switch5) on aggregate access links2. What device must be used between an AUI port of a networking device and themedia to which it is being connected? （3）1) a transducer2) a transmitter3) a transceiver4) a transponder5) a port replicator3. An ISDN Basic Rate Interface (BRI) is composed of how many signalingchannels? （1）1) 12) 23) 34) 44. Which layer of the OSI model covers physical media? （1）1) Layer 12) Layer 23) Layer 34) Layer 45) Layer 56) Layer 65. What type of network cable is used between a terminal and a console port? （3）1) cross-over2) straight-through3) rollover4) patch cable6. What is the recommended maximum number of workstations configured on apeer-to-peer network? （3）1) 252) 153) 104) 55) 27. Which of the following increases the potential for a collision to occur? （4）1) the use of an active hub instead of an intelligent hub2) the use of an intelligent hub instead of an active hub3) a reduction in the number of devices attached to the hub4) an increase in the number of devices attached to the hub8. What is the maximum length of a media segment used for 100BASE-TX? （1）1) 100 meters2) 185 meters3) 400 meters4) 500 meters9. Which cable diagram displays the end to end pinout for a crossover cable usedwith Cisco devices? （3）1) Cable A2) Cable B3) Cable C4) Cable D第六章1. What does the "10" in 10Base2 indicate about this version of Ethernet? （2）1) The version uses Base10 numbering within the frames.2) The version operates at a transmission rate of 10 Mbps.3) Frames can travel 10 meters unrepeated.4) The maximum frame length is 10 octets.2. How is a MAC address represented? （4）1) four groups of eight binary digits separated by a decimal point2) four Base10 digits separated by a decimal point3) six hexadecimal digits4) twelve hexadecimal digits5) twenty-four Base10 digits3. Which of the following statements are correct about CSMA/CD? (Choose three.)（1，3，6）1) It is a media access method used in LANs.2) It is a media access method used in FDDI WANs.3) When a device needs to transmit, it checks to see if the media is available.4) A device sends data without checking media availability because all deviceshave equal access.5) Multiple devices can successfully transmit simultaneously.6) Only one device can successfully transmit at a time.4. Which devices shown in the graphic must have a MAC address? （5）1) only PC2) only router3) PC and router4) PC, hub, and router5) PC, printer, and router第七章1. Which of the following items are common to all 100BASE technologies?(Choose three.) （1，4，5）1) frame format2) media3) connectors4) timing5) multi-part encoding2. Which of the following does 1000BASE-T use to accomplish gigabit speeds onCat 5e cable? （4）1) the use of four conductors in full-duplex mode2) the use of two multiplexed pairs of wires, simultaneously3) the use of three pairs of wires for data and the fourth for stabilization andforward error correction4) the use of all four pairs of wires in full-duplex mode, simultaneously3. For which of the following is Ethernet considered the standard? (Choose three.)（1，4，5）1) inter-building connection2) mid-length voice3) video conferencing4) vertical wiring5) horizontal wiring6) diagonal wiring4. To make sure timing limitations are not violated when implementing a 10 MbpsEthernet network involving hubs or repeaters, a technician should adhere to which rule? （4）1) the 4-5-3 rule2) the 6-4-2 rule3) the 3-4-5 rule4) the 5-4-3 rule5. What is the maximum distance that 10BASE-T will transmit data before signalattenuation affects the data delivery? （1）1) 100 meters2) 185 meters3) 300 meters4) 500 meters6. When using Category 5 UTP cable, which RJ-45 pin pairs are used to exchangedata between hosts on an Ethernet network? （2）1) 1 and 2; 4 and 52) 1 and 2; 3 and 63) 3 and 6; 7 and 84) 4 and 5; 7 and 8第八章1. John has been hired as the network administrator of a local company and hasdecided to add more hubs to the company's existing network. Which of the following has been caused by John's inexperience? （1）1) collision domain extended2) an increased number of collision domains3) increased network performance4) increased bandwidth5) extended bandwidth2. "CompA" is trying to locate a new computer named "CompB" on the network.Which of the following does "CompA" broadcast to find the MAC address of "CompB"? （2）1) MAC request2) ARP request3) ping4) Telnet5) proxy ARP3. Which of the following is a term associated with replacing hubs with switchesto increase the number of collision domains? （3）1) encapsulation2) latency3) segmentation4) layered model5) broadcast domain6) Extended4. The accumulation of traffic from which of the following can cause a networkcondition called broadcast radiation? (Choose three.) （3，5，6）1) anonymous FTP servers2) telnet sessions3) video over IP applications4) NAS services5) ARP requests6) RIP updates5. Which of the following describes the use of Spanning Tree Protocol (STP)? （4）1) resolve routing loops2) eliminate Split Horizon errors3) limit collisions4) resolve switching loops6. Which term describes the delay in time that occurs when a frame leaves itssource device and reaches its destination? （4）1) collision2) backoff3) attenuation4) latency5) broadcast7. Based on the graphic above, which of the following occurs as each host systemcomes on line in the topology? （2）1) The switch sends its MAC address to each host.2) The switch adds MAC address to the bridge table as each host sends a frame.3) Each host exchanges MAC addresses with each other.4) The switch listens for data traffic to block since the switch lacks an IP address. 8. Which devices segment collision domains? (Choose two.) （2，3）1) transceiver2) router3) switch4) hub5) media9. Which protocol is used to eliminate switching loops? （3）1) Transmission Control Protocol2) Routing Information Protocol3) Spanning Tree Protocol4) Interior Gateway Routing Protocol5) Internetworking Protocol10. Refer to the exhibit. A network associate needs to establish an Ethernetconnection between Host A and Host B. However, the distance between the two hosts is further than the cabling standards allow. Which two devices that operate at the physical layer of the OSI can be used to allow Host A and Host B to communicate? （2，5）1) switch2) hub3) bridge4) router5) repeater第九章1. Which term describes an ARP response by a router on behalf of a requestinghost? （3）1) ARP2) RARP3) Proxy ARP4) Proxy RARP2. Which protocol functions at the internet layer of the TCP/IP protocol suite? （4）1) File Transfer Protocol (FTP)2) Trivial File Transfer Protocol (TFTP)3) Transmission Control Protocol (TCP)4) Internet Protocol (IP)5) User Datagram Protocol (UDP)6) Simple Mail Transport Protocol (SMTP)3. Which of these workstation installation and setup tasks are concerned withnetwork access layer functions? (Choose two.) （2，4）1) configuring the e-mail client2) installing NIC drivers3) configuring IP network settings4) connecting the network cable5) using FTP to download application software updates4. Which part of an IP address identifies a specific device on a network? （4）1) first two octets2) third and fourth octets3) network portion4) host portion5) only the fourth octet5. Which of the following are features of the Internet Protocol (IP)? (Choose two.)（1，3）1) It is the most widely implemented global addressing scheme.2) It allows two hosts to share a single address on a local area network.3) It is a hierarchical addressing scheme allowing addresses to be grouped.4) It is only locally significant, used primarily on local area networks.6. Which of the following are useable Class A IP addresses with a default subnetmask? (Choose three.) （2，3，5）1) 127.0.39.12) 111.9.28.303) 123.1.2.1324) 128.50.38.25) 105.1.34.16) 0.23.92.37. Which application layer protocols use UDP at the transport layer? (Choose two.)（2，4）1) FTP2) SNMP3) Telnet4) DHCP5) SMTP第十章1. Which OSI layer encapsulates data into packets? （3）1) session2) transport3) network4) data link2. Which OSI layer defines the functions of a router? （3）1) physical2) data link3) network4) transport5) session3. Which of the following are Cisco proprietary routing protocols? (Choose two.)（2，6）1) RIPv22) IGRP3) OSPF4) BGP5) RIPv16) EIGRP4. A company with a Class B license needs to have a minimum of 1,000 subnetswith each subnet capable of accommodating 50 hosts. Which mask below is the appropriate one? （4）1) 255.255.0.02) 255.255.240.03) 255.255.255.04) 255.255.255.1925) 255.255.255.2245. A small company has a class C network license and needs to create five usablesubnets, each subnet capable of accommodating at least 20 hosts. Which of the following is the appropriate subnet mask? （3）1) 255.255.255.02) 255.255.255.1923) 255.255.255.2244) 255.255.255.2406. When a network administrator applies the subnet mask 255.255.255.248 to aClass A address, for any given subnet, how many IP addresses are available to be assigned to devices? （6）1) 10222) 5103) 2544) 1265) 306) 67. Host A is assigned the IP address 10.18.97.55 /21. How many more networkdevices can be assigned to this subnetwork if Host A is the only one that has an IP address assigned so far? （4）1) 2542) 5093) 10214) 20455) 40946) 81908.Refe r to the exhibit. The network administrator wants to create a subnet for thepoint-to-point connection between the two routers. Which subnetwork mask would provide enough addresses for the point-to-point link with the least number of wasted addresses?1) 255.255.255.1922) 255.255.255.2243) 255.255.255.2404) 255.255.255.2485) 255.255.255.2529. What is the correct number of usable subnetworks and hosts for the IP networkaddress 192.168.35.0 subnetted with a /28 mask?1) 6 networks / 64 hosts2) 14 networks / 32 hosts3) 14 networks / 14 hosts4) 30 networks / 64 hosts10. Which subnet masks would be valid for a subnetted Class B address? (Choosetwo.) （5，6）1) 255.0.0.02) 255.254.0.03) 255.224.0.04) 255.255.0.05) 255.255.252.06) 255.255.255.19211. Refer to the exhibit. How will the Fohi router dynamically learn routes to the192.168.16.16/28, 192.168.16.32/28, and 192.168.16.48/28 subnetworks? （3）1) with a static route2) with a routed protocol3) with a routing protocol4) with a directly connected route12. How many broadcast domains are shown in the diagram? （1）1) three2) four3) five4) six5) seven6) eight13. How many collision domains are shown in the diagram? （5）1) three2) four3) five4) six5) seven6) eight14. A router interface has been assigned an IP address of 172.16.192.166 with amask of 255.255.255.248. To which subnet does the IP address belong?1) 172.16.0.02) 172.16.192.03) 172.16.192.1284) 172.16.192.1605) 172.16.192.1686) 172.16.192.17615. Refer to the exhibit. Host A is sending data to Host B. Once R2 determines thatdata from Host A must be forwarded to R1 to reach Host B, which layer of the OSI model will R2 use to address and build the frames destined for R1?1) physical2) data link3) network4) transport5) session6) presentation16. Which type of address is 192.168.170.112/28?1) host address2) subnetwork address3) broadcast address4) multicast address17. Which type of address is 223.168.17.167/29?1) host address2) multicast address3) broadcast address4) subnetwork address18. Which combination of network id and subnet mask correctly identifies all IPaddresses from 172.16.128.0 through 172.16.159.255?1) 172.16.128.0 255.255.255.2242) 172.16.128.0 255.255.0.03) 172.16.128.0 255.255.192.04) 172.16.128.0 255.255.224.05) 172.16.128.0 255.255.255.19219. Refer to the exhibit. The internetwork in the exhibit has been assigned the IPaddress 172.20.0.0. What would be the appropriate subnet mask to maximize the number of networks available for future growth?1) 255.255.224.02) 255.255.240.03) 255.255.248.04) 255.255.252.05) 255.255.254.06) 255.255.255.0第十一章1. If a network administrator needed to download files from a remote server, whichprotocols could the administrator use to remotely access those files? (Choose two.) （3，5）1) NFS2) ASCII3) TFTP4) IMAP5) FTP6) UDP2. What is established during a connection-oriented file transfer betweencomputers? (Choose two.) （2，5）1) a temporary connection to establish authentication of hosts2) a connection used for ASCII or binary mode data transfer3) a connection used to provide the tunnel through which file headers aretransported4) a command connection which allows the transfer of multiple commands directlyto the remote server system5) a control connection between the client and server3. Which of the following protocols are used for e-mail transfer between clientsand servers? (Choose three.) （3，4，5）1) TFTP2) SNMP3) POP34) SMTP5) IMAP46) postoffice4. Which type of institution does the domain suffix .org represent? （4）1) government2) education3) network4) non-profit5. Which of the following services is used to translate a web address into an IPaddress? （1）1) DNS2) WINS3) DHCP4) Telnet6. Which part of the URL http://www.awsb.ca/teacher gives the name of thedomain? （4）1) www2) http://3) /teacher4) awsb.ca7. Which protocols are TCP/IP application layer protocols? (Choose two.) （2，4）1) UDP2) FTP3) IP4) SMTP5) TCP8. What are three characteristics of the TCP protocol? (Choose three.) （3，4，6）1) has less overhead than UDP2) is used for IP error messages3) forces the retransmission undelivered packets4) creates a virtual session between end-user applications5) carries the IP address of destination host in the TCP header6) is responsible for breaking messages into segments and reassembling9. Two peer hosts are exchanging data using TFTP. During the current session, adatagram fails to arrive at the destination. Which statement is true regarding the retransmission of the datagram? （2）1) Datagram retransmission requires user authentication.2) Datagram retransmission is controlled by the application.3) Datagram retransmission relies on the acknowledgements at transport layer.4) Datagram retransmission occurs when the retransmission timer expires in thesource host.案例学习1. 子网计算练习：Answer2. 子网号及广播地址计算练习Answer3. 子网规划练习：已知：给定一个C类地址201.16.5.0/24。
思科CCNA考证习题答案
1. what could be possible causes for the "Serial0/0 is down"interface status? 这可能是为“Serial0 / 0的可能原因是向下”接口的状态？TWOA.a layer 1 problem exists.1层存在问题D.an incorrect cable is being used。
2.before installing a new,upgraded version of the ios,what should be checked on the router,and which command should be used to gather this information?在安装一个新的，升级的IOS版本，应该怎样检查路由器上，并命令应该被用来收集这些资料？B.the amount of avaiable flash and ram 缴费的闪存和RAM的数量D.show version 显示版本3.refer to the exhibit. which two statements are true about inter VLAN routing in the topology that is shown in the exhibit?（choose two）指展览。
这两个语句是对国际米兰的是在展会上展出的拓扑路由的VLAN是否属实？D. the FastEthernet 0/0 inerface on router1 must be configured with subinterfaces.关于路由器1的在FastEthernet 0/0 inerface 必须配置子接口F.the FastEthernet 0/0 interface on router1 and switch2 trunk ports must be configured using the same encapsulation type. 对在FastEthernet 0/0 接口上路由器1和交换器2中继端口必须配置使用相同的封装类型。
计算机科学导论第11章参考答案
CHAPTER 11Data StructuresReview Questions1.We need data structures to hold a collection of related variables so that we cansolve complex problems more efficiently.3.An array is a fixed-size sequenced collection of elements of the same data type.5.Elements of an array are contiguous in memory and can be accessed by use of anindex. Elements of a linked list are stored in nodes that may be scattered through-out memory and can only be accessed via the access functions for the list (i.e., aspecific node is returned by a search function).7.A frequency array shows the number of elements with the same value found in aparticular collection of data.9.An array is stored contiguously in memory. A two-dimensional array uses row-major storage in which the array is essentially stored as an array of arrays.11.The fields of a node in a linked list are the data itself and a pointer (address) to thenext node in the list.13.The head pointer contains the address of the first node in the list.15.A singly linked list is a linked list in which each node contains only one pointerthat contains the address of the following node. There are multi-linked lists inwhich each node contains more than one pointer, allowing for much more complexdata structures.Multiple-Choice Questions17.d19.d21.b23.d25.c27.b29.d34CHAPTER 11DATA STRUCTURES31.a33.a35.bExercises37.CompareInput: Two arrays (A and B) of 10 integers1. Set Index equal to 02. While Index is less than 102.1 If A [Index] is not equal to B [Index]2.1.1 Return falseEnd if2.2 Increment IndexEnd loop3. Return trueEnd39.PrintInput: An array (A), the number of rows (I), and the number columns (J)1. Set RowIndex equal to 02. Set ColIndex equal to 03. While RowIndex is less than I3.1 While ColIndex is less than J3.1.1 Print A [RowIndex][ColIndex]3.1.2 Increment ColIndexEnd loop3.2 Move to next line in output3.3 Increment RowIndexEnd loopEnd41.AddFractionsInput: Two fractions (Fr1 and Fr2)1. Allocate new fraction object (Fr3)2. Set Fr3.denominator equal to Fr1.denominator * Fr2.denominator3. Set Fr3.numerator equal to (Fr1.numerator * Fr2.denominator) +(Fr2.numerator *Fr1.denominator)4. Return Fr3EndSECTION 543.MultiplyFractionsInput: Two fractions (Fr1 and Fr2)1. Allocate new fraction object (Fr3)2. Set Fr3.denominator equal to Fr1.denominator * Fr2.denominator3. Set Fr3.numerator equal to Fr1.numerator * Fr2.numerator4. Return Fr3End45.See Figure 11.1Figure 11.1Exercise 4547.When an element is to be added to the array, a new array must be allocated and allof the old elements and the new element must be moved to the new array.49.Adding an element to a linked list is easier because a linked list does not have to betotally reallocated.51.Accessing an element of an array is easier because an index can be used.53.Sorting an array is easier because the elements can just be swapped rather thanhaving to redirect up to four different pointers.6CHAPTER 11DATA STRUCTURESSECTION 78CHAPTER 11DATA STRUCTURES。
CCNA网络学院第一学期 第十一章配置和测试网络 试题及答案
第十一章配置和测试网络001网络中的用户发现向远程服务器传输文件时响应很慢。
发出什么命令可以确定路由器是否存在任何输入或输出错误？A show running-configB show startup-configC show interfacesD show ip routeE show versionF show memory002请参见图示。
技术人员将图示中的配置应用于全新的路由器。
为了验证配置，技术人员在与该路由器的CLI 会话中发出了show running-config命令。
技术人员在路由器的show running-config命令输出中应看到哪几行结果？A enable password class line console 0 password ccnaB enable secret cisco enable password class line console 0 password ccnaC enable secret 5 $1$v0/3$QyQWmJyT7zCa/yaBRasJm0 enable password class line console 0 password ccnaD enable secret cisco enable password 7 14141E0A1F17 line console 0 password 7 020507550AE enable secret 5 $1$v0/3$QyQWmJyT7zCa/yaBRasJm0 line console 0 password 7 020507550A 003Cisco 路由器上的哪个接口将用于初始配置？A B CD004路由器B 和C 之间的连接测试获得成功。
但是，重新启动路由器C 之后，管理员注意到网络10.10.3.0 和10.10.4.0 之间的响应时间变慢。
两台路由器之间可以成功Ping 通。
思科网院-网络工程-CCNA1-2017计算机科学与技术-一到十一章-题库及答案
某公司正在考虑是使用客户端/服务器还是对等网络。
下列哪三项是对等网络的特征？（选择三项。
）哪种设备的功能是确定消息在网际网络中传输的路径？哪两个条件有助于您从各种网络介质当中选择一种网络介质？（请选择两项。
）下列哪两项描述了中间设备？（选择两项。
）网络上的终端设备有哪两项功能？（选择两项。
）由于许多学生带着自己的平板电脑和智能手机去学校访问学校资源，大学里的IT 人员最有可能需要重新设计的网络区域是什么？家庭用户必须要有哪种网络类型访问才能进行网上购物？一位分支机构办公室的员工正在为客户创建报价。
为此，该员工需要访问位于总部办公室的内部服务器上的机密定价信息。
该员工将要访问哪种类型的网络？下列哪两种连接选项可以为家庭办公室中的计算机提供始终在线的高带宽Internet 连接？（选择两项。
）下列哪两个Internet 连接选项不需要建筑物铺设物理电缆？（请选择两项。
）以下哪种术语描述了当对网络资源的请求超出可用容量时网络的状态？哪种类型的网络流量需要QoS？以下哪项表述准确定义了术语“带宽”？网络管理员正在实施一种要求复杂强密码的策略。
该策略支持哪种数据保护目标？下列哪种说法正确描述了云计算的特征？什么是Internet？下列哪种说法描述了电力线网络技术的用途？哪种安全侵犯会对家庭用户的生活造成最大损害？一位用户正在一个小型办公室网络上实施安全策略。
以下哪两种操作将为此网络提供求？（选择两项。
）A网络能够通过相同的通信通道传输语音、视频、文本和图形。
填空题。
缩写词是指允许员工在公司办公室中使用其个人设备访问网络和其他资源的策略。
正确答案：byod将每个描述与网络通信形式配对请将每个特征对应的internet连接类型进行匹配将每个定义与安全目标配对操作软件内核的作用是什么？网络管理员与交换机建立远程CLI 连接对其实施管理时，需要确保用户ID、密码和会话内容的保密性。
应当选择哪种访问方法？当在安全环境下执行初始配置时，下列哪个程序可用来访问Cisco 2960 交换机？哪个命令或组合键让用户返回命令层级中的上一级？某台路由器具有有效的操作系统，且NVRAM 中存储有配置文件。
ccna章节与期末答案
第一章：正确答案：2.4.5解析：由于不需要使用网络设备和专用服务器，对等网络易于创建，复杂性更低，且成本更少。
而且对等网络也没有集中管理。
这种网络安全性更低，不可扩展，而且那些同时充当客户端和服务器的设备可能性能更差正确答案：1解析：正确答案： 3.5解析：选择网络介质的条件包括：所选介质可以成功传送信号的距离、要安装所选介质的环境、必须传输的数据量和速度以及介质和安装的成本。
正确答案：3和4解析：终端设备上的应用程序可以生成数据，更改数据内容并且负责启动封装过程。
正确答案：1和4解析：终端设备会发出通过网络传输的数据。
中间设备会在链路发生故障时通过备用路径传输数据，并且会过滤数据传输以增强安全性。
网络介质提供网络消息的传输通道。
正确答案：4解析：外联网是公司外部的人或企业合作伙伴访问数据的网络区域。
内部网只描述通常仅供内部人员访问的网络区域。
当设备连接到有线网络时，有线 LAN 会受 BYOD（自带设备）影响。
使用大学无线 LAN 的设备多为平板电脑和智能手机。
大学生主要使用无线 WAN 来访问他们的手机运营商网络。
.正确答案：2解析：由于通过 Internet 可以联系在线供应商，所以家庭用户通过 Internet 进行网上购物。
内联网基本上是仅供内部使用的局域网。
外联网是外部合作伙伴访问组织内部特定资源的网络。
家庭用户并不一定使用 LAN 来访问 Internet。
例如，PC 可以通过调制解调器直接连接到 ISP。
正确答案：1解析：内部网这个术语用于表示一个组织的私有局域网和广域网连接。
内部网的设计旨在仅允许该组织的成员、员工或其他获得授权的人员进行访问。
正确答案：2和4解析：电缆和 DSL 均能实现高带宽、始终联网，并提供到主机计算机或 LAN 的以太网连接。
10正确答案：2和3解析：移动电话连接需要使用移动电话网络。
卫星连接通常用于家庭或企业外部不便使用物理布线的位置。
11正确答案：2解析：当对网络资源的请求超出了可用容量时，网络就会变得拥堵。
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页脚思科ccna 第 11 章测试1 下列哪个网络设计注意事项对大型公司比对小型企业更为重要？正确 响应 您的响应Internet 路由器防火墙低端口密度交换机冗余目前许多小型企业都需要 Internet 访问，它们使用 Internet 路由器来满足需求。
连接两台主机设备和任意IP 或网络设备（例如打印机或扫描仪）需要使用交换机。
交换机可以集成到路由器。
防火墙可用来保护业务信息资产。
很小型的公司通常不会有冗余，但是稍大的小型公司可以使用端口密度冗余或使用冗余 Internet提供商/链路。
此试题参考以下领域的容：Introduction to Networks• 11.1.1 小型网络中的设备2 哪种协议支持流媒体的快速传输？正确 您的页脚响应 响应SNMPTCPPoERTPSNMP 是一种管理协议。
TCP 不适合流媒体的快速传输。
PoE 不是一种协议，而是允许以太网电缆为设备输送电源的标准系统。
此试题参考以下领域的容：Introduction to Networks• 11.1.2 小型网络中的协议3 如何捕获流量才能更好地了解网络中的流量模式？正确 响应 您的响应在利用率较低时在利用率高峰期当流量仅在主干网段上当流量来自用户子集时在利用率较低时捕获流量无法获得不同流量类型的正确表示。
由于某些流量可能局限于特定网段，必须在不同网段上捕获流量。
页脚此试题参考以下领域的容：Introduction to Networks• 11.1.3 发展为大型网络4 网络管理员检查安全日志，发现周末有人未经授权访问了一个部文件服务器。
经过仔细调查文件系统日志，管理员注意到几个重要文档被复制到公司外部的主机。
这种情况代表哪种威胁？正确 响应 您的响应数据丢失身份盗窃信息盗窃服务中断信息盗窃威胁是指公司的部信息被未授权的用户访问和复制。
此试题参考以下领域的容：Introduction to Networks• 11.2.1 网络设备安全措施5 下列哪两项操作可以防止他人成功攻击电子服务器？（请选择两项。
）正确 您的页脚响应 响应不要通过网络以明文形式发送密码。
不要使用需要 Shift 键的密码。
不要允许服务器控制台的物理访问。
仅允许授权人员访问服务器机房。
限制登录到服务器的失败尝试次数。
最常见的一种访问攻击类型是利用数据包嗅探器来获取以明文形式传输的用户和密码。
反复尝试登录到服务器来进行未经授权的访问，属于另一种访问攻击。
限制尝试登录到服务器的次数并使用加密密码，将有助于防止通过这些攻击类型成功登录。
此试题参考以下领域的容：Introduction to Networks• 11.2.2 漏洞和网络攻击6 下列哪种网络攻击会导致网络、系统或服务的禁用或损坏？正确 响应 您的响应侦察攻击访问攻击拒绝服务攻击页脚恶意代码攻击拒绝服务攻击是指网络、系统或服务被禁用或损坏。
侦察攻击是指未经授权搜索和映射系统、服务或漏洞。
访问攻击是指未经授权而控制数据、系统访问或用户权限。
恶意代码攻击是意图导致数据丢失或损坏的计算机程序。
此试题参考以下领域的容：Introduction to Networks•11.2.2 漏洞和网络攻击7 网络管理员发现网络中的各种计算机已经感染蠕虫。
应按哪个步骤顺序消除蠕虫攻击？正确响应您的响应接种、控制、隔离、处理控制、隔离、处理、接种处理、隔离、接种、控制控制、接种、隔离、处理第一步是识别和控制所有被感染的系统（控制）。
随后对系统进行修补（接种），断开网络连接（隔离），然后进行清理（处理）。
此试题参考以下领域的容：Introduction to Networks•11.2.3 缓解网络攻击页脚8 网络使用 NAT 将有什么安全功能？正确 响应 您的响应对部用户隐藏外部 IP 地址对外部用户隐藏部 IP 地址拒绝来自私有 IP 地址的所有数据包拒绝所有部主机与其网络外的设备通信网络地址转换 (NAT) 将私有地址转换为公有地址，以在公共网络上使用。
此功能可防止外部设备查看部主机使用的实际 IP 地址。
此试题参考以下领域的容：Introduction to Networks• 11.2.3 缓解网络攻击9页脚请参见图示。
一家小型公司的基线文档显示，主机 H1 和 H3 之间的 ping 往返时间统计为 36/97/132。
今天，网络管理员在主机 H1 和H3 之间执行 ping 操作来检查连接，得出往返时间 1458/2390/6066。
这对网络管理员来说表示什么？正确响应您的响应H1 和 H3 之间的连接正常。
H3 没有正确连接到网络。
某种原因在 H1 和 R1 之间引起干扰。
网络之间的性能在预计参数之。
页脚某种原因在网络之间引起时间延迟。
Ping 往返时间统计显示毫秒。
数字越大，延迟越多。
基线在性能低下时非常重要。
通过查看网络性能良好时的文档，并与出现问题时的信息进行比较，网络管理员可以更快地解决问题。
此试题参考以下领域的容：Introduction to Networks•11.3.1 Ping10 管理员应在什么时候建立网络基线？正确响应您的响应当网络中的流量达到峰值时当流量突然下降时当网络中的流量达到最低时每隔一段时间定期建立通过定期监控流量可以建立有效的网络基线。
当网络中建立的标准连接出现异常时，管路员可以记录具体情况。
此试题参考以下领域的容：Introduction to Networks•11.3.1 Ping页脚11请参见图示。
管理员尝试排除 PC1 与 PC2 之间的连接故障，并使用 PC1 中的 tracert 命令执行操作。
根据图中所示的输出，管理员应从哪开始故障排除过程？正确响应您的 响应PC2 R1SW2页脚R2SW1Tracert 用于跟踪数据包所采取的路径。
唯一的成功响应来自与发送主机相同 LAN 上的路径中的第一个设备。
第一台设备是路由器 R1 的默认网关。
因此管理员应首先对 R1 进行故障排除。
此试题参考以下领域的容：Introduction to Networks•11.3.2 Tracert12 从路由器 R1 到直接相连的路由器 R2 执行 ping 操作失败。
网络管理员随即发出show cdpneighbors命令。
网络管理员为什么要在两台路由器之间 ping 操作失败后发出此命令？正确响应您的响应由于ping 命令不起作用，网络管理员怀疑存在病毒。
网络管理员想检验第 2 层连接。
网络管理员想检验路由器 R2 的 IP 地址配置。
网络管理员想确定能否从非直接连接的网络建立连接。
show cdp neighbors 命令可用于证明，两台思科设备之间存在第 1 层和第 2 层连接。
例如，如果两台设备有重复的 IP 地址，在设备之间执行 ping 操作将会失败，但是show cdp neighbors的输出将会成功。
如果同一 IP 地址被分配给两台路由器，show cdp neighbors detail 可用于检验直连设备的 IP 地址。
页脚此试题参考以下领域的容：Introduction to Networks• 11.3.4 主机和 IOS 命令13 下列哪种说确描述了思科设备上的 CDP ？正确 响应 您的响应如果有第 3 层连接，show cdp neighbor detail 命令将显示邻居的 IP 地址。
要在全局禁用 CDP ，则必须在接口配置模式下使用 no cdp enable 命令。
CDP 可以全局禁用，也可以在特定接口上禁用。
由于它在数据链路层运行，CDP 协议只能在交换机中实施。
CDP 是一项思科专有协议，可以使用 no cdp run 全局配置命令在全局围禁用，也可使用 no cdp enable 接口配置命令在特定接口上禁用。
由于 CDP 在数据链路层运行，即使不存在第 3 层连接，两台或多台思科网络设备（例如路由器）也可以互相获取信息。
无论能否对邻居执行 ping操作，show cdp neighbors detail 命令都能显示相邻设备的 IP 地址。
此试题参考以下领域的容：Introduction to Networks• 11.3.4 主机和 IOS 命令14 在路由器的特权 EXEC 模式发出 cd nvram: 命令，然后发出 dir 命令有什么作用？正确 您的页脚响应 响应清除 NVRAM 的容将所有新文件指向 NVRAM列出 NVRAM 的容复制 NVRAM 的目录要查看 NVRAM 的容，管理员需要使用 cd （更改目录）命令更改当前默认的文件系统。
dir 命令可以列出文件系统的当前目录容。
此试题参考以下领域的容：Introduction to Networks• 11.4.1 路由器和交换机文件系统15 如果配置文件已保存到连接在路由器上的 USB 闪存驱动器，网络管理员必须执行下列哪项操作才能让路由器使用文件？正确 响应 您的响应将文件系统从 FAT32 转换到 FAT16。
使用文本编辑器编辑配置文件。
将文件权限从 ro 更改为 rw 。
使用路由器上的 dir 命令，取消闪存驱动器上自动按照字母顺序排列 Windows 文件的功能。
页脚此试题参考以下领域的容：Introduction to Networks• 11.4.2 配置文件备份与恢复16 下列哪个命令可将 NVRAM 中存储的配置复制到 TFTP 服务器？正确 响应 您的响应copy running-config tftpcopy tftp running-configcopy startup-config tftpcopy tftp startup-config启动配置文件存储在 NVRAM 中，而运行配置文件存储在 RAM 中。
copy 命令先由源执行，再由目标执行。
此试题参考以下领域的容：Introduction to Networks• 11.4.2 配置文件备份与恢复17 下列关于服务集标识符 (SSID) 的述中，哪两个是正确的？ （选择两项。
）正确 响应 您的响应页脚标识无线设备所属的 WLAN是一个包含 32 个字符的字符串，不区分大小写负责确定信号强度同一 WLAN 中的所有无线设备必须具有相同的 SSID 用于加密通过无线网络发送的数据此试题参考以下领域的容：Introduction to Networks•11.5.1 集成路由器18 符合 IEEE 802.11 标准的 WLAN 可让无线用户做什么？正确响应您的响应使用无线鼠标和键盘使用红外线技术创建一对多的本地网络在非常广大的区域使用移动访问远程服务连接无线主机到有线以太网络中的主机或服务页脚此试题参考以下领域的容：Introduction to Networks• 11.5.1 集成路由器19 哪种 WLAN 安全协议会在每次客户端与接入点建立连接时，自动生成一个新的动态密钥？正确 响应 您的响应EAPPSKWEPWPA此试题参考以下领域的容：Introduction to Networks• 11.5.1 集成路由器20 下列哪两项述说明了无线网络安全的特征？（请选择两项。