Cisco 640-802
Cisco Certified Network Associate (CCNA)
1. 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 router A.控制通过VTY访问路由器
B. to control broadcast traffic through a router B.控制广播流量穿越路由器
C. to filter traffic as it passes through a router
C.过滤穿越路由器的流量
D. to filter traffic that originates from the router 过滤源自路由器的流量
E. to replace passwords as a line of defense against security incursions 用来重置密码以防御攻击
Answer（回答，答案）: AC
2. A default Frame Relay WAN is classified as what type of physical network? 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-point A.点到点
B. broadcast multi-access B.广播多路访问
C. nonbroadcast multi-access C.非广播多路访问
D. nonbroadcast multipoint D.非广播多点
E. broadcast point-to-multipoint E.广播点到多点 Answer: C
3. A single 802.11g access point has been configured and installed in the center of a square office. A few wireless users are experiencing slow performance and drops while most users are operating at 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据时， 一些无线用户发现无线网络变得缓慢和出现丢包 A. mismatched TKIP encryption B. null SSID
C. cordless phones D. mismatched SSID E. metal file cabinets
F. antenna type or direction Answer: CEF
4. 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？
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A. one A.1
B. two
B.2
C. three C.3
D. four D.4 E. five E.5 F. six F.6
Answer: C
5. 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
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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 set
B. The network diagram represents an extended service set (ESS).
B. 网络描述了一个extended service set
C. 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 1
D. 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: BE
6. 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: E
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7. Which type of attack is characterized by a flood of packets that are requesting a TCP connection to 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 service A.拒绝服务
B. brute force B.强制叠加
C. reconnaissance C.监听
D. Trojan horse D.木马
Answer: A
8. Which of the following are associated with the application layer of the OSI model? (Choose
two.)
8.以下两个选项是工作在OSI模型的应用层的？ A. ping B. Telnet C. FTP D. TCP E. IP
Answer: BC
9. Refer to the exhibit. The network administrator has created a new VLAN on Switch1 and added host 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
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