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

D 192.168.60.24/30 [ 90/21026560 ] via 192.168.36.13, 00:00:57, Serial 0/0 D* 198.0.18.0 [ 90/21026560 ] via 192.168.36.13, 00:00:57, Serial 0/0

******************************************************************************** RTR_2#show run

interface FastEthernet0/0

ip address 192.168.77.34 255.255.255.252

interface FastEthernet0/1

ip address 192.168.60.65 255.255.255.240

interface FastEthernet1/0

ip address 192.168.60.81 255.255.255.240

router eigrp 22

network 192.168.77.0

network 192.168.60.0

no auto-summary

RTR_2#show ip route

192.168.60.0/28 is variably subnetted, 2 subnets

C 192.168.60.80 is directly connected, FastEthernet1/0

C 192.168.60.64 is directly connected, FastEthernet0/1

192.168.77.0/30 is subnetted, 1 subnets

C 192.168.77.32 is directly connected, FastEthernet0/0

**********************************************************

RTR_B#show run

interface FastEthernet0/0

ip address 192.168.60.129 255.255.255.240

interface FastEthernet0/1

ip address 192.168.60.145 255.255.255.240

interface Serial0/1

ip address 192.168.60.26 255.255.255.252

router eigrp 212

network 192.168.60.0

RTR_B#show ip route

192.168.60.0/24 is variably subnetted, 5 subnets, 2 masks

C 192.168.60.24/30 is directly connected, Serial0/1

C 192.168.60.128/28 is directly connected, FastEthernet0/0

C 192.168.60.144/28 is directly connected, FastEthernet0/1

D 192.168.60.96/28 [ 90/21026560 ] via 192.168.60.25, 00:00:57, Serial 0/1 D 192.168.60.112/28 [ 90/21026560 ] via 192.168.60.25, 00:00:57, Serial 0/1 192.168.36.0/30 is subnetted, 1 subnets

D 192.168.36.12 [ 90/21026560 ] via 192.168.60.25, 00:00:57, Serial 0/1

D* 198.0.18.0 [ 90/21026560 ] via 192.168.60.25, 00:00:57, Serial 0/1

**************************************************************************

RTR_1#show run

interface FastEthernet0/0

ip address 192.168.77.33 255.255.255.252 !

interface Serial1/0

ip address 198.0.18.6 255.255.255.0

interface Serial0/0

ip address 192.168.36.13 255.255.255.252 clockrate 64000

interface Serial0/1

ip address 192.168.60.25 255.255.255.252 clockrate 64000

router eigrp 212

network 192.168.36.0

network 192.168.60.0

network 192.168.85.0

network 198.0.18.0

no auto-summary

ip classless

ip default-network 198.0.18.0

ip route 0.0.0.0 0.0.0.0 198.0.18.5

ip http server

RTR_1#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 192.168.60.24/30 is directly connected, Serial0/1

D 192.168.60.128/28 [ 90/21026560 ] via 192.168.60.26, 00:00:57, Serial 0/1

D 192.168.60.144/28 [ 90/21026560 ] via 192.168.60.26, 00:00:57, Serial 0/1

D 192.168.60.96/28 [ 90/21026560 ] via 192.168.36.14, 00:00:57, Serial 0/0

192.168.77.0/30 is subnetted, 1 subnets

C 192.168.77.32 is directly connected, FastEthernet0/0

C 192.0.18.0/24 is directly connected, Serial 1/0

*S 0.0.0.0 via 198.0.18.5

271. Please study the diagram carefully, and then drag and drop the network user application to the appropriate description of its primary use(Not all options are used.)

Answer:

272. In order to enhance the security of TestInside enterprise network, TestInside network administrators use ACL(Access Control lists). What are two reasons that the TestInside network administrator would use access lists?

Answer:

The purposes for setting ACLs on a router are controlling vty access into a router and filtering traffic as it passes through a router.

Access Control List(ACL) can be used to affect traffic transmitted from one port to another. It acquired its name due to having filtering capability when traffic flows in and out of interface and it also can be used for other purposes, such as:

A: Place restrictions on accessing router Telnet (VTY) .

B: Filter routing information.

C: Distinguish precedence of WAN traffic by queuing technology .

D: Trigger calls through the Dial-on-demand routing (DDR).

E: Change administrative distance of routing

273. LAB

You work as a network technician at https://www.360docs.net/doc/1b17085456.html,. Study the exhibit carefully. You are required to perform configurations to enable internet access. The TestInside ISP has given you six public IP addresses in the 198.18.32.65 198.18.32.70/29 range.

https://www.360docs.net/doc/1b17085456.html, has 62 clients that needs to have simultaneous internet access. These local hosts use private IP addresses in the 192.168.6.65 - 192.168.6.126/26 range.

You need to configure Router TestInside1 using the TestInsideA console. You have already made basic router configuration.

You have also configured the appropriate NAT interfaces; NAT inside and NAT outside respectively. Now you are required to finish the configuration of TestInside1.

Answer:

TestInside1: TestInside1#Config t

TestInside1(Config)#interface fa0/0

TestInside1(Config-if)#ip nat inside

TestInside1(Config)#interface S0/0

TestInside1(Config-if)#ip nat outside

TestInside1(Config-if)#exit

TestInside1(Config)#access-list 1 permit 192.168.6.65 0.0.0.63

TestInside1(Config)#access-list 1 deny any

TestInside1(Config)#ip nat pool nat_test 198.18.32.65 198.18.32.70 prefix-length 29

TestInside1(Config)#ip nat inside source list 1 pool nat_test overload

This question tests the knowledge of NAT. The IP addresses in this question are changeable.

274. Drag and drop question. Drag the items to the proper locations.

Answer:

275. LAB:

Please input command here:

Answer:

Router>enable

Router#config terminal

Router(config)#hostname TIS-RC

TIS-RC(config)#enable secret TestInside 1

TIS-RC(config)#line console 0

TIS-RC(config-line)#password TestInside2

TIS-RC(config-line)#exit

TIS-RC(config)#line vty 0 4

TIS-RC(config-line)#password TestInside3

TIS-RC(config-line)#login

TIS-RC(config-line)#exit

TIS-RC(config)#interface fa0/0

TIS-RC(config-if)#ip address 209.165.202.158 255.255.255.224 TIS-RC(config-if)#no shutdown

TIS-RC(config-if)#exit

TIS-RC(config)#interface s0/0/0

TIS-RC(config-if)#ip address 192.0.2.30 255.255.255.240

TIS-RC(config-if)#no shutdown

TIS-RC(config-if)#exit

TIS-RC(config)#router rip

TIS-RC(config-router)#version 2

TIS-RC(config-router)#network 209.165.202.128 TIS-RC(config-router)#network 192.0.2.16

TIS-RC(config-router)#end

TIS-RC#copy run start

276. Drop

Answer:

Physical layer: Bit,physical device, cable ,NIC

Data link layer: MAC,NIC,Frame

Network layer: Packet, IP, routing

Transport Layer: segments, windowing,UDP,segment 277. Drag Drop

Answer:

NAT addresses can be divided into two categories: inside network and outside network which are defined based on the NAT functions. The device that has NAT functions connects the inside and the outside network like a bridge, the NIC connected to the inside network is called "inside" , the NIC connected to the

outside network is called "outside", that is to say, the inside addresses are used by the inside network devices, while the outside addresses are used by the outside network devices.

Addresses can also be divided into local and global addresses. Local address refers to the address that can be seen and used by the inside network devices; while global address refers to the address that can be seen and used by the outside network devices.

These four addresses are :

Inside local address is the IP address used by the inside network devices, which is often a private address. Inside global address is a public address provided by ISP. It is often used when the inside network devices communicate with the outside network devices.

Outside local address is the address used by the outside network device as it appears to the inside network device. It is not necessarily a public network address.

Outside global address is the real address used by the outside network devices.

IP packets sent from the inside network devices regard "inside local address" as the source address and "outside local address" as the destination address. When the packets reach the "inside" interface of the NAT equipment, the addresses will be translated into "inside global address" and "outside global address" , the packets will be out from the "outside" interface .

In the same way, IP packets sent from the outside network devices regard "outside global address" as the source address and "inside global address" as the destination address. When the packets reach the "outside" interface of the NAT equipment, the addresses will be translated into "outside local address" and "inside local address", the packets will be out from the "inside" interface.

278. Drag Drop

Answer:

Ip --- protocol Address --- 192.168.125.34 Mask --- 0.0.0.0 279. Drop

Answer:

280. Drop

The Missouri branch office router is connected through its s0 interface to the Alabama Headquarters router s1 interface.The Alabama router has two LANs. Missouri user obtain internet access through the Headquarters router. The network interfaces in the topology are addressed as follows:

Missouri: e0-192.168.35.33/28;

Alabama: e0-192.168.35.49/28

e1-192.168.35.65/28

s1-192.168.35.34/28

CCNA中英对照题库(0-10.pdf概论

CCNA（200-120）题库中英对照整理于：2015年3月31日版本：1.2 声明： ●本题库来源互联网（鸿鹄论坛） ●本题库为英文考试原版左右选择题 ●中文考试为随机抽取英文题的中译版 ●此题库非中文考试题库，而是英文题库手动翻译 ●此题库为手工个人翻译，存在错误和不妥难免，不代表任何官方机构和组织 ●本题库旨在更好的理解英文原本题库，也可以用于中文考试参考用。 ●如发现任何错误或不当之处，可以自行修改，但请更新版本以免混乱，也可致上传者。

QUESTION001 Refer to the exhibit. What will Router1 do when it receives the data frame shown? (Choose three.) 参照下图，这个图示显示了Ｒ１接受到如图所示数据帧的时候会怎么做？ A.Router1 will strip off the source MAC address and replace it with the MAC address 0000.0c36.6965. Ｒ１会剥离源ＭＡＣ地址，以0000：0C36.6965代替。 B.Router1 will strip off the source IP address and replace it with the IP address 192.168.40.1. Ｒ１会剥离源IP地址，以192.168.40.1代替。 C.Router1 will strip off the destination MAC address and replace it with the MAC address 0000.0c07.4320. Ｒ１会剥离源ＭＡＣ地址，以0000：0C36.6965代替。 D.Router1 will strip off the destination IP address and replace it with the IP address of 192.168.40.1. Ｒ１会剥离目的IP地址，以192.168.40.1代替。 E.Router1 will forward the data packet out interface FastEthernet0/1. R1将会从F0/1转发这个数据包。 F. Router1 will forward the data packet out interface FastEthernet0/2. R1将会从F0/2转发这个数据包数据传输过程中，IP 地址不变，但是在不同的网段中，MAC 地址要根据设备的具体情况而发生改变。在不同网络中，依靠 IP 地址定位，在同一网络中，依靠 MAC 地址定位。 QUESTION002

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

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考试题库101-125

QUESTION 101 Refer to the exhibit. The switch in the graphic has a default configuration and the MAC table is fully populated. In addition, this network is operating properly. The graphic represents selected header information in a frame leaving host A. What can be concluded from this information A. The MAC address of host A is B. The router will forward the packet in this frame to the Internet. C. The switch will only forward this frame to the attached router interface. D. All devices in this LAN except host A will pass the packet to Layer 3. QUESTION 102 What is an appropriate use of a default route A. to provide routing to a local web server B. to provide routing from an ISP to a stub network C. to provide routing that will override the configured dynamic routing protocol D. to provide routing to a destination that is not specified in the routing table and which is outside the local network QUESTION 103 Refer to the exhibit. A junior network engineer has prepared the exhibited configuration file. What two statements are true of the planned configuration for interface fa0/1 (Choose two.)

CCNA测试题

CCNA测试题 1、Which of the following host addresses are members of networks that can be routed across the public Internet?(Choose three.) A. 10.172.13.65 B. 172.16.223.125 C. 172.64.12.29 D. 192.168.23.252 E. 198.234.12.95 F. 212.193.48.254 2、What is a global command? A. a command that is available in every release of IOS, regardless of the version or deployment status B. a command that can be entered in any configuration mode C. a command that is universal in application and supports all protocols D. a command that is implemented in all foreign and domestic IOS versions E. a command that is set once and affects the entire router 3、All WAN links inside the ABC University network use PPP with CHAP for authentication security. Which command will display the CHAP authentication process as it occurs between two routers in the network? A. show CHAP authentication B. show interface serial0 C. debug PPP authentication D. debug CHAP authentication E. show ppp authentication chap 4、The RIP network shown in the graphic has been fully operational for two days. Each routing table is complete.Which networks will be included in the next routing update from the Apples router to the Pears router? A. A,B,C,D,E,F B. A,C C. A,B,C D. B,D E. D,E,F

CCNA基础测试题及答案

CCNA试题 1.What is the correct order for the OSI model? B P=Presentation, S=Session, D=Datalink, Ph=Physical, T=Transport, A= Application, N=Network A. P S A PH D N T B. A P S T N D PH C. PH D N T A S P D. P S A T N D PH It is crucial you not only memorize this and know what each layer does. 2. What is encapsulation? C A. Putting the header on an incoming frame B. Putting a header on an incoming segment C. Putting a header on an outgoing frame D. Putting a header on an outgoing bit This also includes trailers and can be put on segments, packets, and frames. 3. Which layer is most concerned with user applications? A A. Application B. Presentation C. Network D. Physical 4. Which of the following is de-encapsulation?A A. Stripping the header from a frame B. Putting a header on a segment C. Putting a header on a frame D. Stripping a frame from a link This also includes trailers as in question 2. 5. What layer converts data into segments? C A. Application B. Presentation C. Transport D. Physical 6. What layer converts data into Packets? A A. Network B. Application C. Physical D. Data Link 7. What layer converts data into Frames? C A. Application B. Physical C. Data Link D. Transport 8. What layer converts data into bits? D

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

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1[1] 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 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 squar A few wireless users are experiencing slow performance and drops while most users are o

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

CCNA四考试答案

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。

网络工程师面试题——CCNA

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。

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

ccna真题

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

CCNA(200-301)题库及答案

Exam A QUESTION 1 A network engineer must create a diagram of a multivendor network.which command must be configured on the Cisco devices so that the topology of the network can be mapped? A.Device(config)#lldp run B.Device(config)#cdp run C.Device(config)# cdp enable D.Device(config)# flow-sampler-map topology Correct Answer: A Section: (none) Explanation Explanation/Reference: QUESTION 2 Which feature on the Cisco Wireless LAN Controller when enabled restricts management access from specific networks? A.CPU ACL B.TACACS C.Flex ACL D.RADIUS Correct Answer: A Section: (none) Explanation Explanation/Reference: Reference: https://https://www.360docs.net/doc/1b17085456.html,/c/en/us/support/docs/wireless-mobility/wlan-security/71978-acl-wlc.html QUESTION 3 When a site-to-site VPN is used, which protocol is responsible for the transport of user data?

CCNA考试试题

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：（）

A、ICMP B、EIGRP C、OSPF D、IS-IS 3、OSPF路由协议的度量标准是： A、带宽 B、延迟 C、开销（cost） D、可靠性 5、路由器工作在OSI的第几层？ A、3 B、2 C、4 D、5 6、可以解决路由环路问题的解决方法是：（） A、采用水平分割 B、加快路由更新报文的发送频率 C、重分布 D、配置静态路由 7、下列选择中哪个是表示路由器的快速以太网口： A、console 0 B、s0/0 C、f0/0 D、e0 8、用来检查到一台主机的网络层是否连通命令是（） A、 Ip Router B、 PING和TRACERT C、 TELNET D、 IPCONFIG 9、路由器提示为：Router(config)#,问现在是处在什么模式？ A、全局配置模式 B、特权用户模式 C、普通用户模式 D、接口模式 10、计算机和交换机的以太口直接连接用什么网络线？ A、直通线 B、反转线 C、交叉线 D、串口线 11、第一次对路由器进行配置时，采用哪种配置方式：（） A、通过CONSOLE口配置 B、通过拨号远程配置 C、通过TELNET方式配置 D、通过哑终端配置 12、作为一个网络维护人员，对于OSPF区域体系结构的原则必须有清楚的了解，下面的论述表达正确的是：（） A 、所有的OSPF区域必须通过域边界路由器与区域0相连，或采用OSPF虚链路。 B、单个区域不能包含没有物理链路的两个区域边界路由器。 C、虚链路可以穿越stub区域。 13、静态路由的缺点是____。 A、不适合小型网络 B、占用CPU资源大 C、当拓扑发生变化时，管理员需要手工改路由信息。 D、在小型局域网内，很容易暴露网络拓扑结构. 14、逆向地址解析协议（Inverse ARP）在帧中继网络的主要功能是：

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