最新CCNA认证考试真题

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（1）TCP/IP Addressing and Protocol

1: Your junior network administrator wants to know what the default subnet mask is for a Class C IP address. What do you tell him?

A. 255.0.0.0

B. 255.255.0.0

C. 255.245.255.0

D. 255.255.255.0

E. 255.255.255.255 2: An application needs to have reliable, end-to-end connect-ivity. Which of the following protocols will give you reliable connectivity?

A. TCP

B. UDP

C. IP

D. ICMP 3: You are designing a network, which needs to support 55 users. You don't plan to extend the segment beyond the current number of users. Which subnet mask would best meet your needs?

A. 255.255.0.0

B. 255.255.255.0

C. 255.255.255.192

D. 255.255.255.160 4: You have added a new switch to your network. You want to manage it remotely, so you need to assign it an IP address. Your router that connects to the switch has an IP address of 172.16.12.33/27. Which of the following addresses can you assign to this switch?

A. 172.16.12.33/28

B. 172.16.12.32/27

C. 172.16.12.33/27

D. 172.16.12.34/27

E. 172.16.12.35/28

F. 172.16.12.38/28

G. 172.16.12.63/27 5: The address 172.16.208.16/20 is a host address in which of the following subnets? A.

172.16.176.0–255.255.240.0

B. 172.16.192.0–255.255.240.0

C. 172.16.208.0–255.255.240.0

D. 172.16.224.0–255.255.240.0 6: You are designing an IP address scheme for your brand new remote office. The vice president of IT calls to tell you that you will be in charge of the 192.168.1.64/26 subnetwork. This supplies you with a single subnetwork with 62 hosts. You need to have at least two subnets with 14 hosts in each subnet. What custom subnet mask should you use?

A. 255.255.255.128

B. 255.255.255.192

C. 255.255.255.224

D. 255.255.255.240

E. 255.255.255.248 7: You have subnetted the 210.106.14.0 network with a /24 mask. Your boss at Acme, Inc. wants to

know how many usable subnetworks and usable host addresses per subnet this would provide. What should you tell her?

A. One network with 254 hosts

B. Two networks with 128 hosts

C. Four networks with 64 hosts

D. Six networks with 30 hosts 8: Identify three valid host addresses in any subnet of the 201.168.27.0 network, assuming a fixed subnet mask of 255.255.255.240. (Choose three.)

A. 201.168.27.33

B. 201.168.27.112

C. 201.168.27.119

D. 201.168.27.126

E. 201.168.27.175

F. 201.168.27.208 9: What is the subnetwork address for a host with the IP address 201.100.5.68/28?

A. 201.100.5.0

B. 201.100.5.32

C. 201.100.5.64

D. 201.100.5.65

E. 201.100.5.31

F. 201.100.5.1 10: Which of the following protocols uses a three-way handshake mechanism to establish sessions?

A. TCP

B. IP

C. UDP

D. IPX

E. Frame relay 11: Which of the following protocols is connection-oriented? A. TCP

B. IP

C. IPX

D. Frame relay 12: You are using an application on your Windows 2000 client machines that provides error

correction. You need a protocol to provide fast transport. Which protocol should your application use?

A. TCP

B. IP

C. UDP

D. SPX

E. AppleTalk 13: When using TCP, after a session is open, the applications can adjust the number of segments they receive before sending an acknowledgment. This behavior is known as ______________.

A. MTU adjustment

B. Windowing

C. Flexible Send Path

D. FCS 14: If the destination did not receive a segment, how will the TCP host know to resend the information?

A. The ACK received will not include the segment number that was not received.

B. The ACK received will include the segment number that was not received.

C. The sending host will send a PACK to verify segment receipt.

D. The destination host will send a YACK message back to the sending host. 15: You are planning on using a single network that supports 208 users. Which IP address class would you choose to be the most efficient?

A. Class A

B. Class B

C. Class C

D. Class D

E. Class E 16: RFC 1918 defines the private IP address ranges. Which of the following IP addresses are considered part of these ranges? (Choose three.)

A. 10.23.45.67

B. 126.21.34.56

C. 172.16.32.1

D. 172.31.234.55

E. 192.169.4.5 17: A new network is being designed for your company, Acme, Inc. If you use a Class C IP network, which subnet mask will provide one usable subnet per department while allowing enough usable host addresses for each department specified in the table?

Department Number of Users Corporate 7 Customer Support 15 Financial 13 HR 7 Engineering 16 A. 255.255.255.0

B. 255.255.255.192

C. 255.255.255.224

D. 255.255.255.240

E. 255.255.255.248 18: Which of these protocols provides data transport, relying on the error correction

capabilities of the application itself?

A. UDP

B. TCP

C. SNMP

D. ICMP 19: Which of the following are used by TCP to ensure reliable delivery of data? (Choose two.)

A. MAC address resolution

B. Sequence numbers

C. Acknowledgments

D. Ping

E. Routing updates 20: You discover that you are able to adjust the window size of the TCP segment. You increase the window size to test the results. What will you observe happening on your network?

A. Increased throughput

B. Decreased throughput

C. Increased latency

D. Decreased reliability

21: Your organization is using the 192.168.1.0/24 address space. You need 28 subnets. What subnet mask would you use to create these subnets?

A. 255.255.255.0

B. 255.255.255.128

C. 255.255.255.192

D. 255.255.255.224

E. 255.255.255.240

F. 255.255.255.248 22: Which of the following protocols maps IP addresses to MAC addresses for connectivity to occur between two hosts?

A. ARP

B. RARP

C. SLARP

D. DHCP 23: Your junior network administrator cannot seem to ping a host in another network and asks you why it isn't working. Which of the following is not an answer that you would give him?

A. The host's default gateway is down.

B. The destination host is not powered on.

C. The IP address of the router interface is incorrect.

D. The IP address of the switch to which the destination host connects is incorrect.

E. The host is in a different subnet. 24: Which of the following classes of IP addresses is utilized for multicasting?

A. Class A

B. Class B

C. Class C

D. Class D 25: You give your IT department a spreadsheet of IP addresses and their subnets. You receive a call from one of the junior techs asking what the /26 means next to the IP addresses. You tell her: A. It represents the number of hosts possible on that subnetwork.

B. It represents the number of subnetworks that are being used.

C. It represents the class of IP address being used.

D. It represents the number of bits in the subnet mask that are 1. 26: You are given an IP network of 192.168.5.0 and told that you need to separate this network into subnetworks that can support a maximum of 16 hosts per subnet. This will help alleviate congestion on the network. What subnet mask can you use to create the subnets necessary to meet the given criteria?

A. 255.0.0.0

B. 255.255.0.0

C. 255.255.255.0

D. 255.255.255.224

E. 255.255.255.240 27: Which of the following would a Class A network be assigned to?

A. Government agency

B. Small-to-medium sized corporation

C. SOHO

D. An individual 28: A client has the IP address

192.168.5.98/27. Which of the following addresses are on the same subnet as this host? (Choose two.)

A. 192.168.5.95

B. 192.168.5.100

C. 192.168.5.128

D. 192.168.5.110 29: Which of the following IP addresses is not a public IP address that can be routed over the Internet?

A. 2.3.4.5

B. 11.12.13.14

C. 165.23.224.2

D. 172.31.45.34

E. 203.33.45.22 30: You are given a Class B network. What

is the default subnet mask assigned to the Class B network?

A. 255.255.255.255

B. 255.255.0.0

D. 0.0.0.0 31: You are troubleshooting your router's interfaces. For some reason, the Ethernet interface will not accept the IP address of 192.168.5.95/27 that you've assigned. Which of the following explains the router's refusal to take the IP address?

A. Class C addresses cannot be assigned to Ethernet interfaces.

B. The /27 is an invalid mask.

C. It is a broadcast address.

D. It is a public IP address.

E. It is a private IP address. 32: You are a network technician at Acme, Inc. You are required to divide the 172.12.0.0 network into subnets. Each subnet must have the capacity of 458 IP addresses. Also, according to the requirements, you must provide the maximum number of subnets. Which subnet mask should you use?

A. 255.255.255.254

C. 255.255.240.254

D. 255.255.0.0 33: What is the subnetwork and broadcast IP address of 192.168.2.37 with the subnet mask of

255.255.255.248?

A. 192.168.2.24/192.168.2.31

B. 192.168.2.32/192.168.2.39

C. 192.168.2.40/192.168.2.47

D. 192.168.2.48/192.168.2.55

E. 192.168.2.56/192.168.2.63 34: One of your co-workers at Acme, Inc., needs to convert the binary number 11011010 into a decimal. What is the decimal equivalent?

A. 218

B. 219

C. 220

D. 221

E. 222 35: One of your co-workers at Acme, Inc., needs to convert the binary number 01011010 into a decimal. What is the decimal equivalent?

A. 75

B. 83

C. 90

D. 97 36: One of your co-workers at Acme, Inc., needs to convert the binary number 11010110 into a decimal. What is the decimal equivalent?

A. 198

B. 214

C. 252

D. 255 37: One of your co-workers at Acme, Inc., needs to convert the binary number 10110110 into a decimal. What is the decimal equivalent?

A. 182

B. 192

C. 202

D. 212 38: You are configuring a subnet for the Acme, Inc., branch office in Beijing. You need to assign IP addresses to hosts in this subnet. You have been given the subnet mask of 255.255.255.224. Which of these IP addresses would be valid? (Choose three.)

A. 15.234.118.63

B. 92.11.178.93

C. 134.178.18.56

D. 192.168.16.87

E. 201.45.116.159

F. 217.63.12.192 39: You are a network technician at Acme, Inc. You have subnetted the 208.98.112.0 network with a /28 mask. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router is using ip subnet-zero?

A. 62 networks and 2 hosts

C. 8 networks and 32 hosts

D. 16 networks and 16 hosts

E. 16 networks and 14 hosts 40: What is a disadvantage of using a connection-oriented protocol such as TCP?

A. Packet acknowledgment might add overhead.

B. Packets are not tagged with sequence numbers.

C. Loss or duplication of data packets is more likely to occur.

D. The application layer must assume responsibility for the correct sequencing of the data packets. 41: You are a network technician at Acme, Inc. You have subnetted the 192.168.72.0 network with a /30 mask for connections between your routers. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router cannot use ip subnet-zero?

A. 62 networks and 2 hosts

C. 8 networks and 32 hosts

D. 16 networks and 16 hosts

E. 14 networks and 14 hosts 42: Which of the following IP addresses are considered "network" addresses with a /26 prefix? (Choose two.)

A. 165.203.2.0

B. 165.203.5.192

C. 165.203.6.63

D. 165.203.6.191

E. 165.203.8.255 43: Identify three valid hosts in any subnet of 192.168.32.0, assuming the subnet mask used is 255.255.255.240. (Choose three.)

A. 192.168.32.33

B. 192.168.32.112

C. 192.168.32.119

D. 192.168.32.126

E. 192.168.32.175

F. 192.168.32.208 44: A Class C network address has been subnetted with a /27 mask. Which of the following addresses is a broadcast address for one of the resulting subnets?

A. 198.57.78.33

B. 198.57.78.64

C. 198.57.78.97

D. 198.57.78.97

E. 198.57.78.159

F. 198.57.78.254 45: What is the subnetwork address for a host with IP address 165.100.5.68/28?

A. 165.100.5.0

B. 165.100.5.32

C. 165.100.5.64

D. 165.100.5.65

E. 165.100.5.31

CCNA试题

CCNA强化一、单项选择题： 1、介质100BaseT的最大传输距离是：(b ) A: 10m B:100m C:1000m D:500m 2、路由器下，由一般用户模式进入特权用户模式的命令是：（c ）A：enable B:config C: interface D:router 3、哪个命令可以成功测试网络：( b ) A： Router> ping 192.5.5.0 B： Router# ping 192.5.5.30 C： Router> ping 192.5.5.256 D： Router# ping 192.5.5.255 4、介质工作在OSI的哪一层（ a ） A：物理层 B：数据链路层 C：网络层 D：传输层 5、100baseT的速率是( c )Mbit/s A: 1 B:10 C:100 D:1000 6、在启用EIGRP协议时，所需要的参数是：( c ) A:网络掩码 B:子网号 C:自治系统号 D:跳数 7、基本IP访问权限表的表号范围是：(b ) A: 1—100 B:1-99 C:100-199 D:800-899 8、查看路由表的命令是：( c ) A:show interface B:show run C:show ip route D:show table 9、工作在OSI第三层的设备是：( b )

A:网卡 B:路由器 C: 交换机 D:集线器 10、OSI第二层数据封装完成后的名称是：( c ) A:比特 B: 包 C:帧 D:段 11、为了禁止网络210.93.105.0 ftp到网络223.8.151.0，允许其他信息传输，则能实现该功能的选项是：( d ) A：access-list 1 deny 210.93.105.0.0.0.0.0.0 B： access-list 100 deny tcp 210.93.105.0 0.0.0.255 223.8.151.0 0.0.0.255 eq ftp C：access-list 100 permit ip any any D：access-list 100 deny tcp 210.93.105.0 0.0.0.255 223.8.151.0 0.0.0.255 eq ftp access-list 100 permit ip any any 12、路由器下“特权用户模式”的标识符是：( c ) A: > B:! C:# D: (config-if)# 13、把指定端口添加到VLAN的命令是：( d ) A: vlan B: vlan-membership C: vtp D:switchport 14、交换机工作在OSI七层模型的哪一层(b ) A:物理层 B:数据链路层 C:网络层 D:传输层 15、在OSI七层模型中，介质工作在哪一层( c ) A:传输层 B:会话层 C:物理层 D:应用层 16、交换机转发数据到目的地依靠( b )

CCNA期末考试试题

1、要求: (1)VTP域名为benet;密码为123;启用修剪; (2)配置2台3层交换机为VTP的server模式;配置2层交换机为VTP的client模式; (3)设置SW-3L-1是VLAN 2－6的生成树根网桥;设置SW-3L-2是VLAN 7－11的生成树根网桥;在2层交换机上配置速端口与上行速链路; (4)配置路由器接口的IP地址;配置路由器启动RIP路由协议;配置路由器上的默认路由，指向10.1.1.1/24; (5)在3层交换机上配置各VLAN的IP地址;配置两台3层交换机之间的 EthernetChannel; (6)配置3层交换机的路由接口;在3层交换机上配置RIP路由协议（1）（2）

○1SW1-3L 配置vtp域名benetpassword 123 Server模式 SW2-3L同样配置 ○2SW1-3L启用修剪SW2-3L同样配置 ○3SW3-2L配置vtp的client模式、SW4-2L、SW5-3L、SW6-3L相同配置（3）设置SW-3L-1是VLAN 2－6的生成树根网桥;设置SW-3L-2是VLAN 7－11的生成树根网桥;在2层交换机上配置速端口与上行速链路; ○1SW-3L-1是VLAN 2－6的生成树根网桥;; ○2设置SW-3L-2是VLAN 7－11的生成树根网桥

○3SW3-2L配置速端口与上行链路，SW4-2L、SW5-2L 、SW6-2L上同样配置（4）配置路由器接口的IP地址;配置路由器启动RIP路由协议;配置路由器上的默认路由，指向10.1.1.1/24 ○1路由器上配置ip地址 ○2路由器上配置默认路由和RIP

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CCNA最新题库

270. EIGRP After adding RTR_2 router, no routing updates are being exchanged between RTR_1 and the new location. All other inter connectivity and internet access for the existing locations of the company are working properly. The task is to identify the fault(s) and correct the router configuration to provide full connectivity between the routers. Access to the router CLI can be gained by clicking on the appropriate host. All passwords on all routers are cisco . IP addresses are listed in the chart below.

Answer: RTR_A#show run ! ! interface FastEthernet0/0 ip address 192.168.60.97 255.255.255.240 ! interface FastEthernet0/1 ip address 192.168.60.113 255.255.255.240 ! interface Serial0/0 ip address 192.168.36.14 255.255.255.252 clockrate 64000 ! router eigrp 212 network 192.168.36.0 network 192.168.60.0 no auto-summary ! RTR_A#show ip route 192.168.36.0/30 is subnetted, 1 subnets C 192.168.36.12 is directly connected, Serial 0/0 192.168.60.0/24 is variably subnetted, 5 subnets, 2 masks C 192.168.60.96/28 is directly connected, FastEthernet0/0 C 192.168.60.112/28 is directly connected, FastEthernet0/1 D 192.168.60.128/28 [ 90/21026560 ] via 192.168.36.13, 00:00:57, Serial 0/0 D 192.168.60.144/28 [ 90/21026560 ] via 192.168.36.13, 00:00:57, Serial 0/0

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第1章考试 1 一家拥有10 名员工的小型公司使用单个LAN 在计算机之间共享信息。哪种类型的In 连接适合此公司由当地电话服务提供商提供的拨号连接能够使公司方便且安全地连接员工的虚拟专用网络通过当地服务提供商建立的私有专用线路通过当地服务提供商提供的宽带服务（如DSL）答案：4 解析：对于这种小型办公室，比较适合通过被称为数字用户线路(DSL) 的常见宽带服务实现Internet 连接，这种服务由当地的电话服务提供商提供。由于员工人数很少，带宽的问题并不突出。如果公司较大，在远程站点有分支机构，则专用线路会更加适合。如果公司员工需要通过Internet 与公司联系，则采用虚拟专用网。 2 哪种网络情况需要使用WAN 员工工作站需要获取动态分配的IP 地址。员工在出差时需要通过VPN 连接到公司电子邮件服务器。分支机构的员工需要与同一园区网络上的另一座建筑物内的公司总部共享文件。员工需要访问托管在其建筑物内DMZ 中的公司Web 服务器上的网页。答案：2 解析：当出差的员工需要通过WAN 连接到公司电子邮件服务器时，VPN 将通过WAN 连接在员工笔记本电脑与公司网络之间创建一个安全隧道。通过DHCP 获取动态IP 地址是LAN 通信的功能。在企业园区的不同建筑物之间共享文件可通过LAN 基础设施来实现。DMZ 是企业LAN 基础设施内一个受保护的网络。 3 以下哪项描述了WAN 的特征 WAN 和LAN 在同一地理范围内运行，但有串行链路。 WAN 网络归运营商所有。所有串行链路均被视为WAN 连接。 WAN 可提供到园区主干网的终端用户网络连接。答案：2 解析：WAN 可用于将企业LAN 互连到远程分支机构站点LAN 和远程工作人员站点。WAN 归运营商所有。虽然WAN 连接一般通过串行接口实现，但并不是所有串行链路均连接至WAN。LAN（而非WAN）可在组织中提供终端用户网络连接。

ccna真题

C C N A测试真题1 router1下面有120个PC router2下面有60个PC router3下面有28个PC router4下面有12个PC 解决方案：根据题目的要求，进行子网划分 router1 router2 router3 router4 直连地址： router0*router1:地址242/30 router0*router2:246/30 router0*router3:250/30 router0*router4:254/30 配置： Router0(config)#ints0/3/0 Router0(config-if)#nosh Router0(config-if)#ipadd Router0(config-if)#ints0/3/1 Router0(config-if)#nosh Router0(config-if)#ipadd Router0(config-if)#ints0/2/0 Router0(config-if)#nosh Router0(config-if)#ipadd Router0(config-if)#ints0/2/1 Router0(config-if)#nosh Router0(config-if)#ipadd Router1(config)#intg0/0 Router1(config-if)#nosh Router1(config-if)#ipadd Router1(config-if)#ints0/3/0 Router1(config-if)#nosh Router1(config-if)#ipadd Router2(config)#intg0/0 Router2(config-if)#nosh Router2(config-if)#ipadd Router2(config)#ints0/3/0 Router2(config-if)#nosh Router2(config-if)#ipadd

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CCNA测试真题 1 要求公司进行IP子网规划，内网网段是192.168.1.0/24，进行一下子网划分 router1下面有120个PC router2下面有60个PC router3下面有28个PC router4下面有12个PC 要求PC都能自动获得地址，并且只有router0是DHCP服务器，DNS地址是10.10.10.100 router0，router1,router2,router3,router4的互联地址也在192.168.1.0/24这个子网。解决方案：根据题目的要求，进行子网划分 router1 是192.168.1.0/25 网关地址192.168.1.1 router2 是192.168.1.128/26 网关地址192.168.1.129 router3 是192.168.1.192/27 网关地址192.168.1.193 router4 是192.168.1.224/28 网关地址192.168.1.225 直连地址： router0*router1 :地址192.168.1.241/30 *192.168.1.242/30 router0*router2 :地址192.168.1.245/30 *192.168.1.246/30 router0*router3 :地址192.168.1.249/30 *192.168.1.250/30 router0*router4 :地址192.168.1.253/30 *192.168.1.254/30 配置： Router0(config)#int s0/3/0 Router0(config-if)#no sh Router0(config-if)#ip add 192.168.1.241 255.255.255.252 Router0(config-if)#int s0/3/1 Router0(config-if)#no sh Router0(config-if)#ip add 192.168.1.245 255.255.255.252 Router0(config-if)#int s0/2/0 Router0(config-if)#no sh Router0(config-if)#ip add 192.168.1.249 255.255.255.252 Router0(config-if)#int s0/2/1 Router0(config-if)#no sh Router0(config-if)#ip add 192.168.1.253 255.255.255.252 Router1(config)#int g0/0 Router1(config-if)#no sh Router1(config-if)#ip add 192.168.1.1 255.255.255.128 Router1(config-if)#int s0/3/0 Router1(config-if)#no sh Router1(config-if)#ip add 192.168.1.242 255.255.255.252

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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? A. one A.1 B. two B.2 C. three C.3

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什么是三层交换，说说和路由的区别在那里？三层交换机和路由器都可工作在网络的第三层，根据ip地址进行数据包的转发（或交换），原理上没有太大的区别，这两个名词趋向于统一，我们可以认为三层交换机就是一个多端口的路由器。但是传统的路由器有3个特点：基于CPU的单步时钟处理机制；能够处理复杂的路由算法和协议；主要用于广域网的低速数据链路在第三层交换机中，与路由器有关的第三层路由硬件模块也插接在高速背板/总线上，这种方式使得路由模块可以与需要路由的其他模块间高速的交换数据，从而突破了传统的外接路由器接口速率的限制(10Mbit/s---100Mbit/s)。对路由知识的掌握情况，对方提出了一个开放式的问题：简单说明一下你所了解的路由协议。路由可分为静态&动态路由。静态路由由管理员手动维护；动态路由由路由协议自动维护。路由选择算法的必要步骤：1、向其它路由器传递路由信息；2、接收其它路由器的路由信息； 3、根据收到的路由信息计算出到每个目的网络的最优路径，并由此生成路由选择表； 4、根据网络拓扑的变化及时的做出反应，调整路由生成新的路由选择表，同时把拓扑变化以路由信息的形式向其它路由器宣告。两种主要算法：距离向量法（Distance Vector Routing）和链路状态算法（Link-State Routing）。由此可分为距离矢量（如：RIP、IGRP、EIGRP）&链路状态路由协议（如：OSPF、IS-IS）。路由协议是路由器之间实现路由信息共享的一种机制，它允许路由器之间相互交换和维护各自的路由表。当一台路由器的路由表由于某种原因发生变化时，它需要及时地将这一变化通知与之相连接的其他路由器，以保证数据的正确传递。路由协议不承担网络上终端用户之间的数据传输任务。简单说下OSPF的操作过程 ①路由器发送HELLO报文；②建立邻接关系；③形成链路状态④SPF算法算出最优路径⑤形成路由表 ※OSPF路由协议的基本工作原理，DR、BDR的选举过程，区域的作用及LSA的传输情况（注：对方对OSPF的相关知识提问较细，应着重掌握）。特点是：1、收敛速度快；2、支持无类别的路由表查询、VLSM和超网技术；3、支持等代价的多路负载均衡；4、路由更新传递效率高（区域、组播更新、DR/BDR）；5、根据链路的带宽（cost）进行最优选路。通过发关HELLO报文发现邻居建立邻接关系，通过泛洪LSA形成相同链路状态数据库，运用SPF算法生成路由表。

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复习提纲： 1、路由产生的方式直链路由、静态路由、动态路由 2、管理距离 3、rip \eigrp\ospf的基本特点、所使用的组播地址 4、RIP更新周期，RIP路由协议采用UDP的端口、rip协议避免路由环路的方法, 5、Enable password和enable secret命令的作用？ 6、running-config、startup-config文件的是什么？ 7、ospf的配置；route-id 确定原则；DR选举的原则；域内路由、域间路由、域外路由的概念；ospf汇总的种类；ospf的网络类型；ospf 的度量值(比如以太)、理解ospf的特殊区域 8.什么是后继和可行后继？如何通过RD和FD理解可行性条件？9．PPP的两种认证的特点？ 10、NAT的类型与差别是什么？查看及其清除Nat 映射表 11、acl的种类,及其功能 12、ipv6地址分类及其配置命令 13、路由重分布的命令(metric等参数)、ospf 14、路由器配置寄存器选择题例题 1、255.255.0.0是哪类地址的默认掩码？ A、B B、A C、 C D、E 2、基于距离矢量算法的路由协议是：（）

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CCNA640-802 V13题库试题分析题库讲解：吴老师（艾迪飞CCIE实验室首发网站：https://www.360docs.net/doc/0e2565481.html, 1. What are two reasons that a network administrator would use access lists? (Choose two.) A. to control vty access into a router B. to control broadcast traffic through a router C. to filter traffic as it passes through a router D. to filter traffic that originates from the router E. to replace passwords as a line of defense against security incursions Answer: AC 解释一下：在VTY线路下应用ACL，可以控制从VTY线路进来的telnet的流量。也可以过滤穿越一台路由器的流量。 2. A default Frame Relay WAN is classified as what type of physical network? A. point-to-point B. broadcast multi-access C. nonbroadcast multi-access D. nonbroadcast multipoint E. broadcast point-to-multipoint Answer: C 解释一下：在默认的情况下，帧中继为非广播多路访问链路。但是也可以通过子接口来修改他的网络的类型。 3．Refer to the exhibit. How many broadcast domains exist in the exhibited topology?

CCNA基础知识考题汇总.doc

1、OSI模型包括哪7层？答：从上到下分别为：应用层、表示层、会话层、传输层、网络层、数据链路层、物理层 2、TCP/IP模型包括哪4层？答：从上到下分别为：过程/应用层、主机到主机层、因特网层、网络接入层 3、思科组网模型包括哪3层？答：核心层、汇聚层、接入层 4、TCP与UDP有何区别？答：1. TCP是基于全双工的、血向连接的、可靠传输协议，而UDP是无连接、不可靠传输协议。 2、TCP采用的是虚电路方式，而UDP不采用虚电路。 3、TCP的数据段格式与UDP的数据段格式不一样 4、TCP含有窗口流量控制，而UDP没有 5、TCP如何实现传输的可靠性？答：建立起虚电路连接的“三次握手”原则这是由于TCP的数据段格式而决定了TCP能进行面向连接的可靠传输。 6、DHCP服务提供了哪些内容？答：IP地址、子网掩码、域名、默认网关、DNS. WINS信息 Windows杳看木机ARP信息的命令是什么？答：arp-a 7、Windows跟踪路径的命令是什么？答：Traceroute 8、Windows长ping并改变包大小的命令是什么？答:ping -1 size +ip 地址. 9、Windows 5看木机路由表的命令是什么？答：show ip route 10、IP地址分成哪两个部分？答：ip地址分成主机地址和网络地址 11、如何快速计算某个IP所在的网络地址及广播地址？答：划分了网就需要计算了网掩码和分配相应的主机块，采用十进制计算方法。 12、VLSM及Cl DR的全称是什么？答：VLSM是变长了网掩码；CIDR是无类的内部域路由 13、WWW、FTP、DNS、Telnets POP3、SMTP、远程桌面这些应用分别使用的TCRUDP

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CCNA、CCNP、CCIE模拟试题topology change occurs? A.flooding B.broadcasting C.convergence D.summarizati on 8.Which of the following must be determined first b y the router in order to route the data? A.the distance metric of the data B.the source address of the data C.which routing protocol is used by the data D.whether the protocol suite of the data is active 9.You are a technician at ABC.ABC has the subnet/ mask of172.29.100.0/26set aside for small remote locations.Each location will have5I P devices connected to the network.Which VLSM mask will provide the minimu m number of hosts you require? A./27 B./28 C./29 D./30 E./31 10.You are a trainee technician at ABC.Your instructo r shows you the following route summarization entry: 192.168.134.0/22Your instructor wants to know how many clas

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9、工作在OSI第三层的设备是：( ) A:网卡B:路由器 C: 交换机 D:集线器 10、OSI第二层数据封装完成后的名称是：( ) A:比特 B: 包C:帧 D:段 11、为了禁止网络210.93.105.0 ftp到网络223.8.151.0，允许其他信息传输，则能实现该功能的选项是：( ) A：access-list 1 deny 210.93.105.0.0.0.0.0.0 B： access-list 100 deny tcp 210.93.105.0 0.0.0.255 223.8.151.0 0.0.0.255 eq ftp C：access-list 100 permit ip any any D：access-list 100 deny tcp 210.93.105.0 0.0.0.255 223.8.151.0 0.0.0.255 eq ftp access-list 100 permit ip any any 12、路由器下“特权用户模式”的标识符是：( ) A: > B:! C:# D: (config-if)# 13、把指定端口添加到VLAN的命令是：( ) A: vlan B: vlan-membership C: vtp D:switchport 14、交换机工作在OSI七层模型的哪一层( ) A:物理层B:数据链路层 C:网络层 D:传输层 15、在OSI七层模型中，介质工作在哪一层( ) A:传输层 B:会话层C:物理层 D:应用层

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