ccna第五章考试题
CCNA-Exploration-网络基础知识-第五章练习及答案
○10.10.10.26○127.0.0.1○10.10.10.6○10.10.10.1○224.0.0.0
□R1使用192.168.0.1作为下一跳地址将数据包从192.168.12.0网络路由到172.16.0.0网络。
□R3使用172.16.0.1作为下一跳地址将数据包从10.0.0.0网络路由到172.16.0.0网络。
□R2使用192.168.0.1作为下一跳地址将数据包从172.16.0.0网络路由到192.168.12.0网络。
15．请参见图示。图中显示的所有设备均为出厂默认设置。图示拓扑代表多少个广播域？
○3○4○5○7○8○11Otion 216．下列关于路由及其用途的陈述，哪三项是正确的？（选择三项）
□如果找不到通往目的网络的路由，则将数据包返回前一个路由器。
□如果目的网络直接连接的网络，路由器会将数据包转发到目的主机。
○路由器发送ARP请求以确定所需的下一跳地址。
○路由器丢弃数据包。
○路由器将数据包转发到ARP表所示的下一跳。
○路由器将数据包转发到源地址所示的接口。
○路由器将数据包从默认路由条目所确定的接口发出。
Option 2 and Option 5 are correct.
11．将主机分组到同一个网络时应考虑哪些关键因素？（选择三项）
□网关□用途□物理编址□软件版本□地理位置□所有权
Option 2, Option 5, and Option 6 are correct.
12．以下哪一项是路由表条目的组成部分？
CCNA第一学期第五章答案
C C N A第一学期第五章答案集团文件版本号：（M928-T898-M248-WU2669-I2896-DQ586-M1988）最新CCNA第一学期第五章答案一个 MAC 地址包含 6 个字节。
前 3 个字节用于供应商标识，最后 3 个字节必须在同一 OUI 中分配唯一的值。
MAC 地址在硬件中实施。
网卡需要使用 MAC 地址来通过 LAN 通信。
IEEE 规范了 MAC 地址。
争用方法具有不确定性，没有受控访问方法中遇到的开销。
因为设备不需要轮流访问介质，所以无需跟踪次序。
争用方法在介质使用率高的情况下无法很好地扩展。
逻辑链路控制在软件中实施，能够让数据链路层与协议簇的上层协议通信。
网卡驱动程序软件直接与网卡上的硬件交互，可在 MAC 子层和物理介质之间传输数据。
逻辑链路控制在 IEEE 802.2 标准中指定。
IEEE 802.3 是定义不同以太网类型的一组标准。
MAC（介质访问控制）子层负责定位和检索介质上和介质外的帧。
组播 MAC 地址是一个特殊的十六进制数值，以 01-00-5E 开头。
然后将IP 组播组地址的低 23 位换算成以太网地址中剩余的 6 个十六进制字符，作为组播 MAC 地址的结尾。
MAC 地址的剩余位始终为“0”。
在此例中：224（十进制）=> 01-00-5E34（十进制）= 00100010（二进制）= 22（十六进制）56（十进制）= 00111000（二进制）= 38（十六进制）综合结果：01:00:5E:0B:22:38如果整个路径都基于以太网，则目的和源 MAC 地址将随着每个路由器跳数发生变化。
除非网络地址转换处于活动状态，否则目的 IP 地址在整个路径中保持不变。
请参见图示。
由于 PC1 需要向 PC2 发送数据包，因此 PC1 发出一个ARP 请求。
在这种情况下，接下来将发生什么？当一台网络设备要与相同网络中的另一台设备通信时，它会发送广播ARP 请求。
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。
CCNABRAINDUMP5(1)-思科认证试题
CCNABRAINDUMP5(1)-思科认证试题WELL I PASSED THIS TEST WITH A 82% HOPE MY STUDY TIPS AND PRACTICE QUESTIONS HELP!!??DON CCNA, MCSE1. If you wanted to find out which commands where available that started with the letter “T”Help T*Help T?T ?T?? T2. type the command to instruct the router to load the IOS from the file named "ios11.2.img" saved on flash?Load boot flash ios.11.2.imgboot system flash ios11.2.imgload flash ios11.2.imgrun flash ios.11.2.img3. Identify the true statements (2)Store and forward switching creates variable latency through the switchCut through switching creates variables latency through the switchStore and forward switching works at wire speedCut through switching works at wire speed4. Choose the best answers: Which of the following is the session layer concerned with?(2)Managing exchanges of data between presentation layer entitiesFlow Control and windowingEstablishing, managing and and terminating sessionsVerifying data encoding formats5. Which ISDN specification series deals with the concepts and terminology surrounding ISDN? (1)I SeriesQ SeriesE SeriesThere is no specific series6. What does the command “CDP Timer 150” do?Gives CDP a administrative metric of 150Configures the rate at which CDP packets are sentChanges the CDP hold down timerSets the CDP hold down timer to 1507. Which command would set the encrypted secret password to CISCO?Enable secret cisco encryptEnable secret 5 ciscoEnable secret ciscoEnable-secret ciscoEnable password cisco8. How can you get to user exec mode from the console?Type “enable”Type “config terminal”Press the enter key on the keyboard。
ccna2答案第五章
第五章 RIPv1 CCNA2 Exploration: 路由协议和概念 (2010-12-15 18:07:13) 转载▼标签： 杂谈 分类： 2010｜CCNA2官方试题--路由 1窗体顶端ERouting Chapter 7 - CCNA Exploration: 路由协议和概念 (版本 4.0)以下行显示在 show ip route 命令的输出中。
R 192.168.3.0/24 [120/3] via 192.168.2.2, 00:00:30, Serial0/0该路由度量的值是什么？3122030120 窗体底端2窗体顶端下列关于 RIPv1 特性的陈述中，哪两项是正确的？（选择两项。
）它是一种距离矢量路由协议。
它会在路由更新中通告路由的地址和子网掩码。
RIP 消息的数据部分封装在 TCP 数据段中。
RIP 消息的数据部分封装在 UDP 数据段中。
它每 15 秒广播一次更新。
它最多允许路由域中存在 15 台路由器。
窗体底端3窗体顶端请参见图示。
图中所示的网络运行RIPv1。
不久前其中添加了192.168.10.0/24 网络，该网络将只包含最终要防止向新网络中的最终用户设备发送RIPv1 更新，同时允许将此新网络通告给其它路由器，应该在Rou 什么命令？Router1(config-router)# no router ripRouter1(config-router)# network 192.168.10.0Router1(config-router)# no network 192.168.10.0Router1(config-router)# passive-interface fastethernet 0/0Router1(config-router)# passive-interface serial 0/0/0窗体底端4 窗体顶端请参见图示。
该网络包含多台路由器。
CCNA第二学期练习答案chapter5
1Refer to the exhibit. All routers in the exhibit are running RIP v1. The network administrator i show ip route command on router A. What routes would appear in the routing table output i network is converged? (Choose two).R 192.168.2.0/24 [120/1]C 192.168.2.0/24 [120/1]R 10.10.3.0/24 [120/0]C 10.10.3.0/24 [120/1]R 10.10.1.0/24 [120/2]R 10.10.1.0/24 [120/3]2Refer to the exhibit. Router1 is running RIPv1. What command was entered into Router1 to c the gateway of last resort?no auto-summaryip default-network 0.0.0.0ip default-gateway 10.0.0.0ip route 0.0.0.0 0.0.0.0 S0/0/13Refer to the exhibit. Router1 and Router2 are running the RIPv1 protocol. The network admi configures the command network 10.1.0.0 on Router1. What network will Router1 advertise Router2?10.1.0.0/1610.1.0.0/810.0.0.0/1610.0.0.0/84Which of the following would be the correct command sequence to enable RIP on Router B f connected networks?RouterB# router ripRouterB(router)# network 210.36.7.0RouterB(router)# network 220.17.29.0RouterB(router)# network 211.168.74.0RouterB(config)# router ripRouterB(config-router)# network 198.16.4.0RouterB(config-router)# network 211.168.74.0RouterB(config-router)# network 199.84.32.0RouterB(config)# configure router ripRouterB(config-router)# network 210.36.7.0RouterB(config-router)# network 199.84.32.0RouterB(config-router)# network 211.168.74.0RouterB(config)# router ripRouterB(config-router)# network 198.16.4.0RouterB(config-router)# network 210.36.7.0RouterB(config-router)# network 211.168.74.0RouterB(config)# router ripRouterB(config-router)# network 198.16.4.0RouterB(config-router)# network 210.36.7.0RouterB(config-router)# network 220.17.29.05 Which command will display RIP activity as it occurs on a router?debug ip ripshow ip routeshow ip interfaceshow ip protocolsdebug ip rip configshow ip rip database6 Which command or set of commands will stop the RIP routing process?RouterB(config)# router ripRouterB(config-router)# shutdownRouterB(config)# router ripRouterB(config-router)# network no 192.168.2.0RouterB(config)# no router ripRouterB(config)# router no rip7Refer to the output from the show ip route command. What can be concluded from the outp router command?A preferred route to the destination has not been set.There are two equal cost paths to network 1.0.0.0.Both interfaces are being used equally to route traffic.A variance must be set to load-balance across multiple paths.8 The following line was displayed in the output of the show ip route command.R 192.168.3.0/24 [120/3] via 192.168.2.2, 00:00:30, Serial0/0What is the value of the routing metric?31220301209 Which of the following is considered a limitation of RIP v1?RIP v1 does not send subnet mask information in its updates.RIP v1 is not widely supported by networking hardware vendors.RIP v1 consumes excessive bandwidth by multicasting routing updates using a Class DRIP v1 requires enhanced router processors and extra RAM to function effectively.RIP v1 does not support load balancing across equal-cost paths.RIP v1 authentication is complicated and time-consuming to configure.10 What are three characteristics of the RIPv1 routing protocol? (Choose three.)supports the use of VLSMuses hop count as a metricconsiders a metric of 16 as infinityhas an administrative distance of 110 by defaultincludes the destination IP address and subnet mask in routing updatescalculates metrics using the Bellman Ford algorithm11 What will happen if an interface IP address is entered for the address portion of the networkin a RIPv1 configuration instead of a network address?The router will reject the command.A route to the host address will be added to outgoing RIP updates.A route to the host address will be added to the routing table.All interfaces in the same classful network as the configured address will be included in t routing process.12Refer to the exhibit. All routers that are shown are running the RIP routing protocol. All unkno traffic must be forwarded to the ISP. What router or set of routers are recommended to have default route and the default-information originate command issued to implement this forw policy?only Router1only the gateway routerall routers in the networkonly the routers with LANs needing Internet access13Refer to the exhibit. All routers are configured with valid interface addresses in the indicated and are running RIPv1. The network is converged. Which routes are present in the routing ta All routers have all routes in their routing table.All routers have all /30 routes, but do not have /24 routes in their routing table.All routers have all /30 routes. Routers A and E also have some of the /24 routes in their table.All routers have all /30 routes. Routers B and D also have some of the /24 routes in their table.Routers A and E have all routes. Routers B and D have only /30 routes in their routing taRouters A and E have only /24 routes. Routers B and D have only /30 routes in their rout 14Refer to the exhibit. A network consists of multiple routers. What can be verified when the sh protocols command is issued on one of the routers in the network?whether all routes in the network have been properly added to the routing tablerouting protocol configuration in use for IP on this routeroperational status of routing protocols in use on all routers in the networkrouting metric of each network that is listed in the routing table15Refer to the exhibit. The Ethernet interface on Router2 goes down and the administrator noti the route is still valid in the routing table of Router1. How much longer will it take for Router1 the route invalid by setting the metric to 16?30 seconds90 seconds155 seconds180 seconds255 seconds16 What is the default update period in seconds for the RIP routing protocol?10121520306017Refer to the exhibit. What can be concluded from the routing table output of router B?A static default route has been configured on B.The default-information originate command has been entered on A.All traffic that is destined for 192.168.1.1 will be sent to address 0.0.0.0.Hosts on the 10.16.1.0/27 network have 192.168.1.1 configured as the default gateway a 18 Which two statements are true regarding the characteristics of RIPv1? (Choose two).It is a distance vector routing protocol.It advertises the address and subnet mask for routes in routing updates.The data portion of a RIP message is encapsulated into a TCP segment.The data portion of a RIP message is encapsulated into a UDP segment.It broadcasts updates every 15 seconds.It allows a maximum of 15 routers in the routing domain.19Refer to the exhibit. The network that is shown is running RIPv1. The 192.168.10.0/24 netwo recently added and will only contain end users. What command or set of commands should b on Router1 to prevent RIPv1 updates from being sent to the end user devices on the new net still allowing this new network to be advertised to other routers?Router1(config-router)# no router ripRouter1(config-router)# network 192.168.10.0Router1(config-router)# no network 192.168.10.0Router1(config-router)# passive-interface fastethernet 0/0Router1(config-router)# passive-interface serial 0/0/0。
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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1对网络电缆采用的连接器不正确可能产生什么后果？
会将数据转发到错误的节点。
通过该电缆传输的数据可能发生信号丢失。
将对该电缆中传输的数据采用不正确的信号方法。
该电缆中发送的数据所采用的编码方法将更改，用于补偿不当连接。
2大多数企业LAN 中的双绞线网络电缆使用哪种连接器？
BNC
RJ-11
RJ-45
F 型
3在网络中传输数据时，物理层的主要作用是什么？
创建信号以表示介质上每个帧中的比特
为设备提供物理编址
确定数据包的网络通路
控制数据对介质的访问
4数据传输的三种量度标准是什么？（选择三项）
实际吞吐量
频率
幅度
吞吐量
串扰
带宽
5UTP 电缆的哪个特征有助于减少干扰的影响？
屏蔽层中的金属编织
包裹核心的反射涂层
电缆中的线对绕绞
外皮中的绝缘材料
6XYZ 公司正在其数据网络中安装新的电缆。
下列哪两种类型是新架设时最常用的电缆？（选择两项）
同轴
4 类UTP
5 类UTP
6 类UTP
STP
7使用什么设备可以检查安装的光纤是否存在错误并检查其完整性和介质性能？
光注入器
OTDR
TDR
万用表
8以下哪项是单模光缆的特征？
一般使用LED 作为光源
因为有多条光通路，核心相对较粗
价格比多模低
一般使用激光作为光源
9
请参见图示。
哪种 5 类电缆用于在主机 A 和主机 B 之间建立以太网连接？
同轴电缆
全反电缆
交叉电缆
直通电缆
10以下哪项被视为选择无线介质的优点？
主机移动更方便
安全风险更低
减少干扰的影响
环境对有效覆盖面积的影响更小
11如果在网络中使用非屏蔽双绞线铜缆，导致线对内串扰的原因是什么？
相邻线对周围的磁场
使用编织线屏蔽相邻线对
从电缆远端反射回来的电波
因两个节点尝试同时使用介质而导致的冲突
12哪种光纤连接器支持全双工以太网？
13哪种电缆通常与光缆相关联？
主干电缆
水平电缆
跳线电缆
工作区域电缆
14在可能存在电气危险或电磁干扰的LAN 安装中，主干布线建议使用哪种类型的介质？
同轴
光纤
5e 类UTP
6 类UTP
15网络中什么时候使用直通电缆？
通过控制台端口连接路由器时
连接两台交换机时
连接主机与交换机时
连接两台路由器时
16以下哪些特征描述的是光缆？（选择两项）
不受 EMI 或RF I 影响。
每对电缆都包裹在金属箔中。
结合取消、屏蔽和绕绞技术来保护数据。
最高速度为 100 Mbps。
最昂贵的LAN 电缆类型。
17OSI 哪一层负责网络通信的二进制传输、电缆规格和物理方面？
表示层
传输层
数据链路层
物理层
18哪种信号传输方法使用无线电波传送信号？
电
光
无线
参考答案：1、B 2、C 3、A 4、ADF 5、C 6、DE 7、B 8、D 9、C 10、A 11、A 12、C 13、A 14、B 15、C 16、AE 17、D 18、C。