2022思科认证考试真题精选及答案7卷.docx

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1、2022思科认证考试真题精选及答案7卷2022思科认证考试真题精选及答案7卷 第1卷 帧中继环境中，CIR的含义是（）A.提高线路速率B.保证线路速率C.降低线路速率D.配置线路速率正确答案：B Which of the following services use TCP? (Choose three)A. DHCPB. SMTPC. SNMPD. FTPE. HTTPF. TFTP正确答案：BDEB,D,E 解析：Explanation:TCP (Transmission Control Protocol) is a reliable mechanism for data delivery

2、. SMTP, FTP and HTTP services use TCP via ports 25, 20/21, and 80, respectively. Ezonexam has implemented the use of VLANs in their network. Which of the following are considered to be a benefit of VLANs? (Choose three)A. They increase the size of collision domains.B. They allow logical grouping of

3、users by function.C. They can enhance network security,D. The increase the size of broadcast domains while decreasing the number of the broadcast domains.E. The increase the number of broadcast domains while decreasing the size of the broadcast domains.F. They simplify switch administration.正确答案：BCE

4、B,C,E 解析：Explanation:There are many motivations for using VLANs, including these:1. To group users by department, or by groups that work together, instead of by physical location. (B)2. To reduce overhead by limiting the size of each broadcast domain (E)3. To enforce better security by keeping sensi

5、tive devices on a separate VLAN (C)4. To separate specialized traffic from mainstream traffic - for example, putting IP telephones on a separate VLAN form. user PCs. Which of following VLAN frame. encapsulation types are configurable on a Cisco switch? (Select two answer choices.)A. VTPB. 802.1QC. L

6、LCD. ISLE. CDPF. PAP正确答案：BDB,D 解析：Explanation:ISL and 802.1Q are the two trunking encapsulations that can be configured on a Cisco switch. ISL is Cisco proprietary and 802.1Q is the IEEE standard method.Incorrect Answers:A. VTP is the VLAN Trunking Protocol, which is used to carry VLAN information a

7、cross the trunks. The question is asking for the encapsulation options for the trunk, which will be used by VTP.C. LLC is the Logical Link Control, which is a sub-layer of the data link layer.E. CDP is the Cisco Discovery Protocol, which is used by Cisco devices to discover information on neighborin

8、g Cisco devices.F. PAP is the Password Authentication Protocol, which is used as an authentication mechanism on PPP links.要确保交换机成为VLAN30的根网桥,可使用下面哪两个命令之一?()A.spanning-tree vlan 30 priority 0B.spanning-tree vlan 30 priority 16384C.spanning-tree vlan 30 root guaranteeD.spanning-tree vlan 30 root prima

9、ry答案：AD 关于RIP协议描述正确的是（）。A.距离矢量路由协议B.链路状态路由协议C.有RIPv1和RIPv2两个版本D.都使用广播发送，支持验证和VLSM正确答案：AC What is the IEEE standard associated with Gigabit Ethernet? (Select two answer choices)A. 802.11B. 802.5C. 802.3abD. 802.3aeE. 802.3zF. 802.3u正确答案：CEC,E 解析：Explanation:The IEEE 802.3z standard describes 1000BASE

10、-SX.The 1000BaseT standard was released in June 1999, defined by IEEE 802.3ab.Incorrect Answers:A. This describes the standard used for wireless networks.B. This is the standard for token ring networks.D. On June 17, 2022 the IEEE 802.3ae specification for 10 Gigabit Ethernet was approved as an IEEE

11、 standard by the IEEE Standards Association (IEEE-SA) Standards Board.F. IEEE 802.3u describes the standard for 100BASE-TX. A Ezonexam router boots up in ROMMON mode. What is ROM Monitor (ROMMON)?A. A memory component for storing the saved configuration fileB. A memory management toolC. An operating

12、 system used for hardware troubleshooting and for password recoveryD. Temporary storage space for the router operating filesE. The source of the primary Cisco IOS software imageF. None of the above正确答案：CC 解析：Explanation:The ROM Monitor is a very limited code set that enables you to perform. elementa

13、ry functions to manually get the router or switch back to a functioning state. You can perform. low-level diagnostics and even copy a new IOS file to the Cisco device over the console port. It is also used after the break sequence is issued during bootup for password recovery use. 在PING命令的输出显示中，下面的哪

14、一个代表了良好的连接状态?（）A.!B.C.xxxxxD.*正确答案：A2022思科认证考试真题精选及答案7卷 第2卷 IGP是内部网关协议，BGP是外部网关协议。此题为判断题(对，错)。正确答案： PPP工作在OSI的哪一层（）A.物理层B.数据链路层C.网络层D.传输层正确答案：B OSI七层模型中，传输层的数据封装名称为（）A.比特B.帧C.包D.段正确答案：D What is the subnet for the host IP address 172.16.210.0/22?A. 172.16.42.0B. 172.16.107.0C. 172.16.208.0D. 172.16.2

15、52.0E. 172.16.254.0F. None of the above正确答案：CC 解析：Explanation:This question is much easier then it appears when you convert it to binary and do the Boolean operation as shown below:IP address 172.16.210.0 = 10101100.00010000.11010010.00000000/22 mask = 11111111.11111111.11111100.00000000AND result =

16、 11111111.11111111.11010000.00000000AND in decimal= 172. 16. 208. 0 From where does a small network typically get its IP network addresses or IP block?AFrom the Internet Domain Name Registry (IDNR)BFrom the Internet Assigned Numbers Authority (IANA)CFrom the Internet Service Provider (ISP)DFrom the

17、Internet Architecture Board (IAB)ENone of the above正确答案：C解析：Explanation:Normally a small network will be assigned a number of IP addresses from their ISP, or in some cases, such as DSL and cable modem, a single dynamic IP address will be assigned by the ISP. Only very large networks requiring a larg

18、e IP block (normally more than a /20) will register with IANA, RIPE, or ARIN (American Registry of Internet Numbers) to obtain their IP addresses. 都是NAT的地址转换方式()。A.静态地址转换B.动态地址转换C.复用动态地址D.端口地址转换正确答案：ABD 备份路由器IOS的命令是：()A.copy flash tftpB.copy running-configt ftpC.copy IOS tftpD.copy startup-configt f

19、tp正确答案：A You are trying to connect directly into the LAN prot of a Ezonexam router. You want to telnet to the local Cisco router using TCP/IP but cannot create a session.What should you do to resolve the problem?A. Use a straight-through cable to connect your computers COM port to the routers consol

20、e port.B. Use a crossover cable to connect your computers COM port to the routers console port.C. Use a straight-through cable to connect your computers COM port to the routers Ethernet port.D. Use a crossover cable to connect your computers Ethernet port to the routers Ethernet port.E. Use a rollov

21、er cable to connect your computers Ethernet port to the routers Ethernet port.F. Use a straight-through cable to connect your computers Ethernet port to the routers Ethernet port.G. None of the above正确答案：DD 解析：Explanation:In order to connect directly to a router via telnet, you must connect to the r

22、outer via one of the LAN ports. When connecting directly to the Ethernet port with a PC without the use of a switch or hub, a crossover cable must be used.Incorrect Answers:A, B, C. In order to telnet directly into the router via a TCP/IP connection, the COM port of the PC can not be used. The COM p

23、ort is used for direct terminal emulation programs such as HyperTerminal.E. Rollover cables are used for console connections into the router, not for TCP/IP connections.F. Straight through cables are used for connections into a switch or hub from the PC. It will not work for direct Ethernet connecti

24、ons into the router. 当在一个接口上使用ipaccess-group99in命令时，以下哪条关于所引用访问控制列表的描述是正确的（）A.这个列表是编号型扩展ACL，检查离开接口的数据包B.这个列表是命名的扩展ACL，检查进入接口的数据包C.这个列表是编号型标准ACL，检查进入接口的数据包D.这个列表是命名的标准ACL，检查离开接口的数据包正确答案：C2022思科认证考试真题精选及答案7卷 第3卷 In the Ezonexam switched LAN environment, what does the IEEE 802.1Q standard describe?A. V

25、LAN pruningB. A method of VLAN trunkingC. An approach to wireless LAN communicationD. The operation of VTPE. The process for root bridge selectionF. None of the above正确答案：BB 解析：Explanation:A broadcast domain must sometimes exist on more than one switch in the network. To accomplish this, one switch

26、must send frames to another switch and indicate which VLAN a particular frame. belongs to. On Cisco switches, a trunk link is created to accomplish this VLAN identification. ISL and IEEE 802.1Q are different methods of putting a VLAN identifier in a Layer 2 frame. The IEEE 802.1Q protocol interconne

27、cts VLANs between multiple switches, routers, and servers. With 802.1Q, a network administrator can define a VLAN topology to span multiple physical devices. Cisco switches support IEEE 802.1Q for FastEthernet and Gigabit Ethernet interfaces. An 802.1Q trunk link provides VLAN identification by addi

28、ng a 4-byte tag to an Ethernet Frame. as it leaves a trunk port.BPDU防护有何用途?()A.确保端口从正确的上游交换机那里收到了BPDUB.禁止端口接收来自上游交换机的BPDU，而只接收来自根交换机的BPDUC.可在启用了BPDU防护的端口上使用PortFast，在端口收到BPDU时将其关闭D.在端口收到BPDU时将其关闭答案：D 什么是路由环路()A.数据包在路由器的两个环回接口之间来回传递B.从目的地返回的路径与出发路径不同而形成“环路”的情况C.数据包在一系列路由器间不断传输却始终无法到达其真正的目的地的情况D.路由从一种

29、路由协议到另一种路由协议的分布正确答案：C Show cdp interface命令是用于显示以下哪一项的（）A.CDP的时间值和接口状态B.邻居路由器的接口配置C.邻居设备的IP地址D.CDP保持时间正确答案：A 在OSPF的完全存根区域中，使用以下哪种LSAType报文或其它方式与区域间通信：（）A.LSAType1.2B.LSAType3C.LSAType4D.默认路由：0.0.0.0正确答案：D 路由器上，清空路由表的命令是（）A.clear ipB.delete ip routeC.delete routeD.clearip route*正确答案：D The Ezonexam cor

30、porate LAN consists of one large flat network. You decide to segment this LAN into two separate networks with a router. What will be the affect of this change?AThe number of broadcast domains will be decreased.BIt will make the broadcasting of traffic between domains more efficient between segments.

31、CIt will increase the number of collisions.DIt will prevent segment 1s broadcasts from getting to segment 2.EIt will connect segment 1s broadcasts to segment 2.正确答案：D解析：ExplanationA router does not forward broadcast traffic. It therefore breaks up a broadcast domain, reducing unnecessary network tra

32、ffic. Broadcasts from one segment will not be seen on the other segment.Incorrect Answers:A. This will actually increase the number of broadcast domains from one to two.B. All link level traffic from segment one to segment two will now need to be routed between the two interfaces of the router. Alth

33、ough this will reduce the traffic on the LAN links, it does also provide a less efficient transport between the segments.C. Since the network size is effectively cut into half, the number of collisions should decrease dramatically.E. Broadcasts from one segment will be completely hidden from the oth

34、er segment. 以下ACL将对路由器的流量产生何种影响（）A.它将允许所有源自192.168.19.0的网络流量B.它将拒绝源自主机192.168.19.162的流量C.因为通配符掩码忽略了所有比特，所以对流量没有影响D.permitany选项使deny选项失效正确答案：B 请参见图示所有路由器都运行RIPv1 10.1.1.0/29和10.1.1.16/29这两个网络无法互相访问此问题的原因可能是什么()A.因为RIPv1是无类协议，不支持该访问B.RIPv1不支持不连续网络C.RIPv1不支持负载均衡D.RIPv1不支持自动总结正确答案：B2022思科认证考试真题精选及答案7卷 第

35、4卷 下列选项中不属于数据链路层的广域网通信协议的是()。A.HDLCB.PPPC.ICMPD.Frame-Relay正确答案：C 100baseT的速率是()Mbit/sA.1B.10C.100D.1000正确答案：C 什么时候选用PPP而不选用HDLC作为串行线路的二层封装（）A.工作在多厂商环境中B.工作在纯Cisco设备环境中C.需要在同一个线路上同时传输IP和IPX协议时D.必须配置CHAP时正确答案：AD 哪个命令可以使用户在Router(config-if)提示符下进入Router模式（）A.Ctrl+AB.Ctrl+ZC.exitD.exec正确答案：B 交换机的三大功能为（）

36、A.地址学习B.转发过滤C.消除回路D.发送数据包正确答案：ABC Both bridges are switches are being used throughout the Ezonexam LAN. Which of the following statements are true regarding bridges and switches in this network?(Choose 3)A. Switches are primarily software based while bridges are hardware based.B. Switches usually ha

37、ve a higher number of ports than most bridges.C. Bridges are frequently faster than switches.D. Bridges define broadcast domains while switches define collision domains.E. Both bridges and switches forward Layer 2 broadcasts.F. Both bridges and switches make forwarding decisions based on Layer 2 add

38、resses.正确答案：BEFB,E,F 下列哪一条命令是用来保存交换机的配置信息()A.writeB.Copy running-config startup-configC.Write NVRAMD.Copy startup-config running-config正确答案：B What are some of the characteristics of a typical VLAN arrangement, found throughout the Ezonexam switched LAN? (Select all that apply)A. VLANs logically divi

39、de a switch into multiple, independent switches at Layer 2.B. Trunk links can carry traffic for multiple VLANs.C. VLAN implementation significantly increases traffic due to added trunking information.D. A VLAN can span multiple switches.E. VLANs typically increase the number of switches neededF. VLA

40、Ns typically decrease the number of switches needed正确答案：ABDA,B,D 解析：Explanation:VLANs give you the power of making virtual LAN networks to subdivide collision domains into smaller units of functionality, without being limited by physical location.A is correct because that is the exact function of a

41、VLAN. B is correct because trunk links are used to carry traffic for multiple VLANs. D is correct because a VLAN can and often does span across multiple switches. VTP makes this possible.Incorrect Answers:C. Although trunking information does indeed add some level of overhead, the overall traffic ov

42、erhead is greatly reduced though the use of VLANs.E, F. The number of total switches needed in a network is the result of the number of devices on the entire LAN that need to be connected. Whether VLANs are used or not will have little, if any, impact on the total number of switches needed in a LAN.

43、 距离-向量路由算法最优路径计算的复杂度要比链路-状态路由算法最优路径计算的复杂度大。此题为判断题(对，错)。正确答案：2022思科认证考试真题精选及答案7卷 第5卷 A Ezonexam router boots up in ROMMON mode. What is ROM Monitor (ROMMON)?A. A memory component for storing the saved configuration fileB. A memory management toolC. An operating system used for hardware troubleshootin

44、g and for password recoveryD. Temporary storage space for the router operating filesE. The source of the primary Cisco IOS software imageF. None of the above正确答案：CC 解析：Explanation:The ROM Monitor is a very limited code set that enables you to perform. elementary functions to manually get the router

45、or switch back to a functioning state. You can perform. low-level diagnostics and even copy a new IOS file to the Cisco device over the console port. It is also used after the break sequence is issued during bootup for password recovery use. 交换机转发数据到目的地依靠()A.路由表B.MAC地址表C.访问权限表D.静态列表正确答案：B When you c

46、ompare the differences between half-duplex and full-duplex Ethernet, which of the following characteristics are exclusive to half-duplex? (Select two answer choices)AHalf-duplex Ethernet operates in a shared collision domain.BHalf-duplex Ethernet operates in an exclusive broadcast domain.CHalf-duple

47、x Ethernet has efficient throughput.DHalf-duplex Ethernet has lower effective throughput.EHalf-duplex Ethernet operates in an exclusive collision domain.正确答案：AD解析：Explanation:A single device could not be sending a frame. and receiving a frame. at the same time because it would mean that a collision was occurring. So, devices simply chose n