[IT认证]CCNA考试题库中英文翻译版及答案

CCNA考试题库中英文翻译版及答案111. What are two reasons that a network administrator would use access lists? (Choose two.)1.出于哪两种理由，网络管理员会使用访问列表? A. to control vty access into a routerA.控制通过 VTY访问路由器B. to control broadcast traffic through a routerB.控制广播流量穿越路由器2.一个默认的帧中继 WAN被分类为哪种物理网络类型?A. point-to-pointA.点到点B. broadcast multi-accessB.广播多路访问C. nonbroadcast multi-accessC.非广播多路访问D. nonbroadcast multipointD.非广播多点E. broadcast point-to-multipointE.广播点到多点Answer: C3. A single 802.11g access point has been configured and installed in the center of a squarA few wireless users are experiencing slow performance and drops while most users are oat peak efficiency. What are three likely causes of this problem? (Choose three.)3.一个802.11接入点被部署在一个方形办公室的中央，当大多数用户在大流量传输数一些无线用户发现无线网络变得缓慢和出现丢包A. mismatched TKIP encryptionB. null SSIDC. cordless phonesD. mismatched SSIDE. metal file cabinetsF. antenna type or directionAnswer: CEF4. Refer to the exhibit. How many broadcast domains exist in the exhibited topology?根据下图，图中的拓扑中存在多少个广播域?A. oneA.1B. twoB.2C. threeC.3D. fourD.4E. fiveE.5F. sixF.6Answer: C5. Refer to the exhibit. What two facts can be determined from the WLAN diagram? (Choose two.)5.根据下图，WLAN diagram 决定了哪两个事实A. The area of overlap of the two cells represents a basic service set (BSS).A. 两个 cells 的 overlap的区域描述了一个 basic service setB. The network diagram represents an extended service set (ESS).B. 网络描述了一个 extended service setC. Access points in each cell must be configured to use channel 1.C. 再每个 CELL中的 AP必须被配置成使用 channel 1D. The area of overlap must be less than 10% of the area to ensure connectivity.D. 为了确保连通性,重叠区域必须小于10%E. The two APs should be configured to operate on different channels.E. 两个访问点应该被配置成工作在不同的频道Answer: BE6. The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router.Which of the following statements is true concerning this command?6.路由器上输入命令 frame-relay map ip 10.121.16.8 102 broadcast，以下选项正确的是?A. This command should be executed from the global configuration mode.A.该命令应该在全局配置模式下被执行B. The IP address 10.121.16.8 is the local router port used to forward data.B.IP 地址10.121.16.8是本地路由器用来转发数据的接口C. 102 is the remote DLCI that will receive the information.C.102是远端的 DLCI它将接受信息。D. This command is required for all Frame Relay configurations.D.这个命令要求被配置为所有的帧中继配置。E. The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC.E.这个广播选项允许数据包，例如 rip更新信息，将会被转发通过 PVC.Answer: E7. Which type of attack is characterized by a flood of packets that are requesting a TCP connectionto a server?7.哪种类型的攻击的特点是发大量的 TCP请求连接数据包到服务器?A. denial of serviceA.拒绝服务B. brute forceB.强制叠加C. reconnaissanceC.监听D. Trojan horseD.木马Answer: A8. Which of the following are associated with the application layer of the OSI model? (Choosetwo.)8.以下两个选项是工作在 OSI模型的应用层的?A. pingB. TelnetC. FTPD. TCPE. IPAnswer: BC9. Refer to the exhibit. The network administrator has created a new VLAN on Switch1 and addedhost C and host D. The administrator has properly configured switch interfaces FastEthernet0/13 through FastEthernet0/24 to be members of the new VLAN. However, after the network administrator completed the configuration, host A could communicate with host B, but host A could not communicate with host C or host D. Which commands are required to resolve this problem? 9.网络管理员在交换机1上创建一个新 VLAN并且将主机 C和主机 D加入到此 VLAN中.管理员配置交换机接口 FastEthernet0/13到 FastEthernet0/24成为新 VLAN成员.但是网络管理员完成配置以后,主机 A可以和主机 B通信,但是主机 A不能和主机 C或者主机 D通信.哪个命令可以用来解决这个问题A. Router(config)# interface fastethernet 0/1.3Router(config-if)# encapsulation dot1q 3Router(config-if)# ip address 192.168.3.1 255.255.255.0B. Router(config)# router ripRouter(config-router)# network 192.168.1.0Router(config-router)# network 192.168.2.0Router(config-router)# network 192.168.3.0C. Switch1# vlan databaseSwitch1(vlan)# vtp v2-modeSwitch1(vlan)# vtp domain ciscoSwitch1(vlan)# vtp serverD. Switch1(config)# interface fastethernet 0/1Switch1(config-if)# switchport mode trunkSwitch1(config-if)# switchport trunk encapsulation islAnswer: A10. For security reasons, the network administrator needs to prevent pings into the corporate networks from hosts outside the internetwork. Which protocol should be blocked with access control lists?10.出于安全考虑，网络管理员需要去防止外网主机 PING内网，下面那个协议应该用 access control lists 限制掉A. IPB. ICMPC. TCPD. UDPAnswer: B11. What are two recommended ways of protecting network device configuration files from outside network security threats? (Choose two.)11.哪两种方法被推荐用来保守网络设备的配置文件不受外网的威胁A. Allow unrestricted access to the console or VTY ports.A.允许 unrestricted 访问到 console或 VTY口B. Use a firewall to restrict access from the outside to the network devices.B.用防火墙去限制外网的网络设备访问C. Always use Telnet to access the device command line because its data is automatically encrypted.C.因为数据被自动加密，所以总是允许使用 TELNET命令访问网络设备的命令行，D. Use SSH or another encrypted and authenticated transport to access device configurations.D.使用 SSH或其他加密、认证机制去访问设备的配置E