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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.wendangku.net/doc/52177307.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?

A.IKEv2

B.IKEv1

C.IPsec

D.MD5

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

QUESTION 4

How do TCP and UDP differ in the way that they establish a connection between two endpoints？

A.TCP use the three-way handshake,and UDP dose no guarantee message delivery

B.TCP use synchronization packets,and UDP uses acknowledgement packets

C.UDP provides reliable message transfer,and TCP is a connectionless protocol.

D.UDP use SYN,SYN ACK,and FIN bits in the frame header while TCP uses SYN,SYN ACK,and ACK bis.

Correct Answer: A

Section: (none)

Explanation

Explanation/Reference:

QUESTION 5

What are two reasons that cause late collisions to increment on an Ethernet interface?(choose two)

A.when the sending device waits 15 seconds before sending the frame again

B.when the cable length limits are exceeded

C.when one side of the connection is configured for half-duplex

D.when Carner Sense Multiple Access/Collision Detection is used

E.when a collision occurs after the 32nd byte of a frame has been transmitted

Correct Answer: BD

Section: (none)

Explanation

Explanation/Reference:

QUESTION 6

A Cisco IP phone receive untagged data traffic from an attached PC. Which action is taken by the phone?

A.It allows the traffic to pass through unchanged

B.It drops the traffic

C.It tags the traffic with the default VLAN

D.It tags the traffic with the native VLAN

Correct Answer: A

Section: (none)

Explanation

Explanation/Reference:

QUESTION 7

Refer to the exhibit. The show ip ospf interface command has been executed on R1 How is OSPF configured?

A.The interface is not participating in OSPF

B.A point-to-point network type is configured

C.The default Hello and Dead timers are in use

D.There are six OSPF neighbors on this interface

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

QUESTION 8

What benefit does controller-based networking provide versus traditional networking?

A.provides an added layer of security to protect from DDoS attacks

https://www.wendangku.net/doc/52177307.html,bines control and data plane functionality on a single device to minimize latency

C.moves from a two-tier to a three-tier network architecture to provide maximum redundancy

D.allows configuration and monitoring of the network from one centralized point

Correct Answer: D

Section: (none)

Explanation

Explanation/Reference:

QUESTION 9

When a floating static route is configured, which action ensures that the backup route is used when the primary route fails?

A.The floating static route must have a higher administrative distance than the primary route so it is used as a backup

B.The administrative distance must be higher on the primary route so that the backup route becomes secondary.

C.The floating static route must have a lower administrative distance than the primary route so it is used as a backup

D.The default-information originate command must be configured for the route to be installed into the routing table

Correct Answer: A

Section: (none)

Explanation

Explanation/Reference:

QUESTION 10

Which mode must be used to configure EtherChannel between two switches without using a negotiation protocol?

A.on

B.auto

C.active

D.desirable

Correct Answer: A

Section: (none)

Explanation

Explanation/Reference:

QUESTION 11

What are two descriptions of three-tier network topologies? (Choose two.)

A.The distribution layer runs Layer 2 and Layer 3 technologies.

B.The network core is designed to maintain continuous connectivity when devices fail.

C.The core layer maintains wired connections for each host.

D.The core and distribution layers perform the same functions

E.The access layer manages routing between devices in different domains.

Correct Answer: AB

Section: (none)

Explanation

Explanation/Reference:

QUESTION 12

Refer to the exhibit.which statement explains the configuration error message that is received?

A.it belongs to a private IP address range

B.the router dose not support /28 mask

C.it is a network IP address

D.it is a broadcast IP address

Correct Answer: D

Section: (none)

Explanation

Explanation/Reference:

QUESTION 13

what is the expected outcome when an EUI-64 address is generated?

A.The seventh bit of original MAC address of the interface is inverted

B.The interface ID is configured as a random 64-bit value

C.The characters FE80 are inserted at the beginning of the MAC address of the interface

D.The MAC address of the interface is used as the interface ID without modification

Correct Answer: A

Section: (none)

Explanation

Explanation/Reference:

QUESTION 14

Which function does an SNMP agent perform?

A.It manages routing between Layer 3 devices in a network,

B.It coordinates user authentication between a network device and a TACACS+ or RADIUS server.

C.It sends information about MIB variables in response to requests from the NMS.

D.It requests information from remote network nodes about catastrophic system events.

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

QUESTION 15

Refer to the exhibit.The default-information originate command is configured under the R1 OSPF configuration.After testing,workstation on VLAN 20 at Site B cannot reach a DNS server on the Internet.

wihch action corrects the configuration issue?

A.Add the default-information originate command on R2

B.Add the always keyword to the default-information originate command on R1

C.Configure the ip route 0.0.0.0 0.0.0.0 10.10.10.18 command on R1

D.Configure the ip route 0.0.0.0 0.0.0.0 10.10.10.2 command on R2

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

QUESTION 16

What are two benefits of network automation? (Choose two)

A.reduced operational costs

B.reduced hardware footprint

C.faster changes with more reliable results

D.fewer network failures

E.increased network security

Correct Answer: AC

Section: (none)

Explanation

Explanation/Reference:

QUESTION 17

Which two command sequences must you configure on a switch to establish a Layer 3 EtherChannel with an open-standard protocol?(choose two) A.interface GigabitEthernet0/0/1

Channel-group 10 mode active

B.interface GigabitEthernet0/0/1

Channel-group 10 mode auto

C.interface GigabitEthernet0/0/1

Channel-group 10 mode on

D.interface port-channel 10

no switchport

ip address 172.16.0.1 255.255.255.0

E.interface port-channel 10

switchport

Switchport mode trunk

Correct Answer: AD

Section: (none)

Explanation

Explanation/Reference:

QUESTION 18

Which command prevents passwords from being stored in the configuration as plaintext on a router or switch?

A.enable secret

B.service password-encryption

https://www.wendangku.net/doc/52177307.html,ername Cisco password encrypt

D.enable password

Correct Answer: B

Section: (none)

Explanation

Explanation/Reference:

QUESTION 19

R1 has learned route 10.10.10.0/24 via numerous routing protocols,which route is installed?

A.route with the lowest cost

B.route with the shortest prefix length

C.route with the next hop that has the highest IP

D.route with the lowest administrative distance

Correct Answer: D

Section: (none)

Explanation

Explanation/Reference:

QUESTION 20

which network allows devices to communicate without the need to access the internet?

A.172.9.0.0/16

B.172.28.0.0/16

C.192.0.0.0/18

D.209.165.201.0/24

Correct Answer: B

Section: (none)

Explanation

Explanation/Reference:

QUESTION 21

Which attribute does a router use to select the best path when two or more different routes to the same destination exist from two different routing protocols?

A.dual algorithm

B.metric

C.administrative distance

D.hop count

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

QUESTION 22

which command must be entered when a device is configured as an NTP server?

A.ntp master

B.ntp sever

C.ntp authenticate

D.ntp peer

Correct Answer: A

Section: (none)

Explanation

Explanation/Reference:

QUESTION 23

When OSPF learns multiple paths to a network, how does it select a route?

A.It multiple the active K value by 256 to calculate the route with the lowest metric.

B.For each existing interface, it adds the metric from the source router to the destination to calculate the route with the lowest

bandwidth.

C.It divides a reference bandwidth of 100 Mbps by the actual bandwidth of the existing interface to calculate the router with the lowest

cost.

D.It count the umber of hops between the source router and the destination to determine the router with the lowest metric

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

QUESTION 24

What is a characteristic of spine-and-leaf architecture?

A.It provides variable latency.

B.Each link between leaf switches allows for higher bandwidth.

C.Each device is separated by the same number of hops.

D.It provides greater predictability on STP blocked ports.

Correct Answer: B

Section: (none)

Explanation

Explanation/Reference:

QUESTION 25

Which two outcomes are predictable behaviors for HSRP? (Choose two)

A.The two routers share a virtual IP address that is used as the default gateway for devices on the LAN.

B.The two routers negotiate one router as the active router and the other as the standby router

C.Each router has a different IP address both routers act as the default gateway on the LAN, and traffic is load balanced between

them.

D.The two routers synchronize configurations to provide consistent packet forwarding

E.The two routed share the same IP address, and default gateway traffic is load-balanced between them

Correct Answer: AB

Section: (none)

Explanation

Explanation/Reference:

QUESTION 26

Which action must be taken to assign a global unicast IPv6 address on an interface that is derived from the MAC address of that interface?

A.explicitly assign a link-local address

B.disable the EUI-64 bit process

C.enable SLAAC on an interface

D.configure a stateful DHCPv6 server on the network

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

QUESTION 27

Refer to the exhibit. What is the effect of this configuration?

A.The switch port interface trust state becomes untrusted

B.The switch port remains administratively down until the interface is connected to another switch

C.Dynamic ARP inspection is disabled because the ARP ACL is missing

D.The switch port remains down until it is configured to trust or untrust incoming packets

Correct Answer: A

Section: (none)

Explanation

Explanation/Reference:

QUESTION 28

In which way does a spine-and-leaf architecture allow for scalability in a network when additional access ports are required?

A. A spine switch and a leaf switch can be added with redundant connections between them

B. A spine switch can be added with at least 40 GB uplinks

C. A leaf switch can be added with connections to every spine switch

D. A leaf switch can be added with a single connection to a core spine switch

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

QUESTION 29

Refer to the exhibit.Router R1 is running three different routing protocols.Which route characteristic is used by the router to forward the packet that receives for

destination IP 172.16.32.1?

A.metric

B.longest prefix

C.cost

D.administrative distance

Correct Answer: B

Section: (none)

Explanation

Explanation/Reference:

QUESTION 30

Which configuration is needed to generate an RSA key for SSH on a router?

A.Configure the version of SSH

B.Configure VTY access.

C.Create a user with a password

D.Assign a DNS domain name

Correct Answer: D

Section: (none)

Explanation

Explanation/Reference:

QUESTION 31

Which API is used in controller-based architectures to interact with edge devices?

A.overlay

B.northbound

C.underlay

D.southbound

Correct Answer: D

Section: (none)

Explanation

Explanation/Reference:

QUESTION 32

Router R1 must send all traffic without a matching routing-table entry to 192.168.1.1.which configuration accomplishes this task?

A.R1# config t

R1(config)# ip routing

R1(config)# ip route default-route 192.168.1.1

B.R1# config t

R1(config)# ip routing

R1(config)# ip route 0.0.0.0 0.0.0.0 192.168.1.1

C.R1# config t

R1(config)# ip routing

R1(config)# ip route 192.168.1.1 0.0.0.0 0.0.0.0

D.R1# config t

R1(config)# ip routing

R1(config)# ip default-gateway 192.168.1.1

Correct Answer: B

Section: (none)

Explanation

Explanation/Reference:

QUESTION 33

What is a benefit of using a Cisco Wireless LAN Controller?

A.Central AP management requires more complex configurations

B.Unique SSIDs cannot use the same authentication method

C.It supports autonomous and lightweight APs

D.It eliminates the need to configure each access point individually

Correct Answer: D

Section: (none)

Explanation

Explanation/Reference:

QUESTION 34

An engineer must configure a /30 subnet between two routers.which usable IP address and subnet mask combination meets this criteria?

A.interface e0/0

description to HQ-A370:98968

ip address 10.2.1.3 255.255.255.252

B.interface e0/0

description to HQ-A370:98968

ip address 192.168.1.1 255.255.255.248

C.interface e0/0

description to HQ-A370:98968

ip address 172.16.1.4 255.255.255.248

D.interface e0/0

description to HQ-A370:98968

ip address 209.165.201.2 255.255.255.252

Correct Answer: D

Section: (none)

Explanation

Explanation/Reference:

QUESTION 35

Which unified access point mode continues to serve wireless clients after losing connectivity to the Cisco Wireless LAN Controller?

A.sniffer

B.mesh

C.flexconnect

D.local

Correct Answer: C

Section: (none)

Explanation

Explanation/Reference:

https://https://www.wendangku.net/doc/52177307.html,/c/en/us/td/docs/wireless/controller/8-5/configguide/

b_cg85/flexconnect.html

QUESTION 36

Refer to the exhibit. Based on the LACP neighbor status, in which mode is the SW1 port channel configured?

A.passive

B.mode on

C.auto

D.active

Correct Answer: D

Section: (none)

Explanation

Explanation/Reference:

QUESTION 37

which WPA3 enhancement protects against hackers viewing traffic on the Wi-Fi network?

https://www.wendangku.net/doc/52177307.html,IP encryption

B.SAE encryption

C.AES encryption

D.scrambled encryption key

Correct Answer: B

Section: (none)

Explanation

Explanation/Reference:

QUESTION 38

Refer to the exhibit. An engineer is bringing up a new circuit to the MPLS provider on the Gi0/1 interface of Router1.The new circuit uses eBGP and teams the route to VLAN25 from the BGP path. What is the expected behavior for the traffic flow for route

10.10.13.0/25?

A.Traffic to 10.10.13.0.25 is load balanced out of multiple interfaces

B.Route 10.10.13.0/25 is updated in the routing table as being learned from interface Gi0/1.

C.Traffic to 10.10.13.0/25 is a symmetrical

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

思科第一学期期末考试最新考题CCNA1

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Refer to the exhibit. Which set of devices contains only intermediary devices? A, B, D, G A, B, E, F C, D, G, I G, H, I, J 3 Refer to the exhibit. The headers added at each layer are shown. Which layer adds the destination and source process num ensure that data is delivered to the correct application? physical layer data link layer network layer

transport layer 4The Layer 4 header contains which type of information to aid in the delivery of data? service port number host logical address device physical address virtual connection identifier 5Which fiber connector supports full-duplex Ethernet? 6Which device should be used for routing a packet to a remote network? access switch DHCP server

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○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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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 )

CCNA1 Final Exam CCNA第一学期期末考试2011-10-10

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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 Final E am CCNA第一学期期末考试

CCNA1 ENetwork Final Exam - CCNA Explorati on: 网络基础知识 (版本下列有关网络层编址的陈述中哪三项是正确的?（选择三项。）网络层编址使用分层式结构。使用长度为48 位的地址。以太网交换机可以使用它来作出转发决定。它不支持广播。其使用的编址方法可以识别地址的网络部分。网络层编址可以区分每台主机。请参见图示。在PC 上发出所示的命令。IP 地址代表什么？主机的IP 地址主机的默认网关主机的主页IP 地址主机的首选域名服务器

网站的IP 地址。哪三个地址属于公有IP 地址？（选择三项。）数据链路层有哪两项功能？（选择两项）分割和记录数据。在源主机和目的主机上运行的程序之间进行数据交换。控制数据如何传递到介质中。生成信号以表示每个帧中的比特。使用帧头和帧尾封装每个数据包，以便在本地介质中进行传输。请参见图示。主机A 要访问Internet。哪项第2 层地址和第3 层地址的组合可以让主机A 实现此访问？目的MAC：，默认网关：目的MAC：，默认网关：目的MAC：，默认网关：目的MAC：，默认网关：

下列哪三项是CSMA/CD 的特征？（选择三项。）设备会侦听介质，并且仅当无法检测到介质上存在其它信号时才会传输数据。介质上的所有设备均可侦听所有通信。设备根据配置的优先级来进行通信。发生冲突后，引起冲突的设备会优先尝试传输数据。发生冲突时，所有设备会在一段时间内停止传输数据，该段时间的长度随机决定。CSMA/CD 使用令牌系统来避免冲突。下列哪三个IPv4 地址代表子网的有效网络地址？（选择三项。）请参见图示。用记号来表示每条介质链路。用来连接不同设备的正确电缆类型是什么？连接1 - 直通电缆，连接2 - 直通电缆，连接3 - 交叉电缆连接1 - 直通电缆，连接2 - 交叉电缆，连接3 - 全反电缆连接1 - 交叉电缆，连接2 - 全反电缆，连接3 - 直通电缆连接1 - 交叉电缆，连接2 - 直通电缆，连接3 - 交叉电缆连接1 - 直通电缆，连接2 - 全反电缆，连接3 - 交叉电缆

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第章考试练习题

1.填空题。请勿使用缩写。网络工程师正在对网络上新的VLAN配置进行故障排除。哪个命令用于显示交换机上存在的VLAN的列表？Showvlan 2.在多层交换机的多个VLAN之间，流量如何路由？流量通过内部VLAN接口路由。流量通过子接口路由。流量通过物理接口路由。流量从所有物理接口广播出去。 3. 请参见图示。根据showrunning-config命令输出，为VLAN15、30和45实施单臂路由器配置。使用/24网络的VLAN45上的PC 无法连接/24网络中VLAN30上的PC。哪种错误可能导致此问题？ GigabitEthernet0/0.30上缺少noshutdown命令 GigabitEthernet0/0接口缺少IP地址。在GigabitEthernet0/0.45上配置了错误的VLAN 在GigabitEthernet0/0.30上配置了错误的IP地址。 4.哪种类型的VLAN间通信设计需要配置多个子接口？单臂路由器通过多层交换机路由传统VLAN间路由管理VLAN的路由

5. 请参见图示。VLAN之间没有通信。可能是什么问题？交换机和路由器之间都存在双工问题。路由器上使用了错误的端口。 Gi1/1交换机端口不处于中继模式。默认网关没有针对每个VLAN进行配置。 6. 请参见图示。路由器RA收到一个数据包，其源地址为路由器会将该数据包从接口FastEthernet0/1.3转发出去。路由器会将该数据包从接口FastEthernet0/1.2和接口FastEthernet0/1.3转发出去。路由器会将该数据包从接口FastEthernet0/1.1转发出去。路由器将丢弃该数据包。路由器会将该数据包从接口FastEthernet0/1.2转发出去。7.

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。

ccna1章节与期末答案

第一章：正确答案：2.4.5 解析：由于不需要使用网络设备和专用服务器，对等网络易于创建，复杂性更低，且成本更少。而且对等网络也没有集中管理。这种网络安全性更低，不可扩展，而且那些同时充当客户端和服务器的设备可能性能更差正确答案：1 解析：

正确答案： 3.5 解析：选择网络介质的条件包括：所选介质可以成功传送信号的距离、要安装所选介质的环境、必须传输的数据量和速度以及介质和安装的成本。正确答案：3和4 解析：终端设备上的应用程序可以生成数据，更改数据内容并且负责启动封装过程。正确答案：1和4 解析：终端设备会发出通过网络传输的数据。中间设备会在链路发生故障时通过备用路径传输数据，并且会过滤数据传输以增强安全性。网络介质提供网络消息的传输通道。

正确答案：4 解析：外联网是公司外部的人或企业合作伙伴访问数据的网络区域。内部网只描述通常仅供内部人员访问的网络区域。当设备连接到有线网络时，有线LAN 会受BYOD（自带设备）影响。使用大学无线LAN 的设备多为平板电脑和智能手机。大学生主要使用无线WAN 来访问他们的手机运营商网络。 . 正确答案：2 解析：由于通过Internet 可以联系在线供应商，所以家庭用户通过Internet 进行网上购物。内联网基本上是仅供内部使用的局域网。外联网是外部合作伙伴访问组织内部特定资源的网络。家庭用户并不一定使用LAN 来访问Internet。例如，PC 可以通过调制解调器直接连接到ISP。正确答案：1 解析：内部网这个术语用于表示一个组织的私有局域网和广域网连接。内部网的设计旨在仅允许该组织的成员、员工或其他获得授权的人员进行访问。

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

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CCNA Study Notes1(1)-思科认证试题 1. Identify and describe the functions of each of the seven layers of the OSI reference model. Physical Layer The physical layer defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between communicating network systems. Physical layer specifications define such characteristics as voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, and the physical connectors to be used. Data Link Layer The data link layer provides reliable transit of data across a physical network link. Different data link layer specifications define different network and protocol characteristics, including the following: Physical addressing --Physical addressing (as opposed to network addressing) defines how devices are addressed at the data link layer. Network topology -- Data link layer specifications often define how devices are to be physically connected (such as in a bus or a ring topology). Error notification -- Error notification involves alerting upper layer protocols that a transmission error has occurred. Sequencing of frames --Sequencing of data frames involves the reordering of frames that are transmitted out of sequence. Flow control -- Flow control involves moderating the transmission of data so that the receiving device is not overwhelmed with more traffic than it can handle at one time. The Institute of Electrical and Electronics Engineers (IEEE) has subdivided the data link layer into two sublayers: Logical Link Control (LLC) and Media Access Control (MAC).

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