晚上好，我是老杨。

不止一个粉丝好奇地问我，思科认证和华为认证的真题水平到底有多难。

上一期，我已经更新了华为的真题，感兴趣的朋友可以文章链接查看：《华为原厂真题》

思科认证技术点到底有多少，这么一看，多一目了然。

光看是不是没感觉啊？

老杨还备了12道难度适中的思科认证真题，不多不少，做一遍不就知道难度了吗？

为了还原体验感，本次试题的内容均为英文，这样就可以更好地感受一下自己的水平。

为了更好解答粉丝疑惑，本次的测试题老杨专门放上了解析，供君理解和参考。

今日文章阅读福利：《思科CCNA题库（精选328页）》

作为练手或者是体验考试氛围，这份CCNA的考试真题很适合你。官方发布，题库每道题都有中文翻译。私信老杨，备注“CCNA”，前6名粉丝可以免费领取阅读福利！

思科认证考试真题·基础版（EI方向）

1. Which two statements are true about the command ip route 172.16.3.0 255.255.255.0 192.168.2.4? (Choose two.)

A. It establishes a static route to the 172.16.3.0 network.

B. It establishes a static route to the 192.168.2.0 network.

C. It configures the router to send any traffic for an unknown destination to the 172.16.3.0 network.

D. It configures the router to send any traffic for an unknown destination out the interface with the address 192.168.2.4.

E. It uses the default administrative distance.

F. It is a route that would be used last if other routes to the same destination exist.

2. A company is installing IP phones. The phones and office computers connect to the same device. To ensure maximum throughput for the phone data, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffic. What is the best network device to which to directly connect the phones and computers, and what technology should be implemented on this device? (Choose two.)

A. hub

B. router

C. switch

D. STP

E. subinterfaces

F. VLAN

3. Refer to the exhibit. A network associate needs to configure the switches and router in the graphic so that the hosts in VLAN3 and VLAN4 can communicate with the enterprise server in VLAN2. Which two Ethernet segments would need to be configured as trunk links? (Choose two.)

A. A

B. B

C. C

D. D

E. E

F. F

4. Which two values are used by Spanning Tree Protocol to elect a root bridge? (Choose two.)

A. amount of RAM

B. bridge priority

C. IOS version

D. IP address

E. MAC address

F. speed of the links

5. A network administrator changes the configuration register to 0x2142 and reboots the router. What are two results of making this change? (Choose two.)

A. The IOS image will be ignored.

B. The router will prompt to enter initial configuration mode.

C. The router will boot to ROM.

D. Any configuration entries in NVRAM will be ignored.

E. The configuration in flash memory will be booted.

1-5：AE,CF,CF,BE,BD

第1题解析：这条路由的意思是如果想去 172.16.3.0 网络，就把 192.168.2.4 作为下一跳，同时管理距离没有改，静态路由默认的管理距离就是默认 1

第2题解析：题目大意是语音电话和公司电脑在一个网络，如果想最大程度保证电话的数据流不被其他数据流影响，应该如何选择设备，在这里交换机每个端口都是一个冲突域，可使通讯效率更好，还可以把电话端口和数据流端口划分到不同 vlan 中，做到互不影响，故选 CF。

第3题解析：这个题目考查的是对单臂路由的了解， 很明显的是路由器与 交换机，以及交换机与交换机之间需要封装Trunk 链路。故正确答案为 C和F

第4题解析：选举根桥顺序记住两个参数就可以了，一个是桥优先级， 一个是桥 MAC 地址。

第5题解析：分析我们路由器默认的 IOS 寄存值为 0X2102 ，下次启动会加载上次的所做的配置；0X2142 会忽略上次的配置。

A：IOS的映像将被忽略。错

B：路由器将迅速进入初始配置模式， 这个是正确的。

C：路由器将从只读 存储器（R OM ）上启动。错

D：NVRAM 中的任何配置将被完全忽略。正确

E：将从闪存的配置中启动。错

6. Switch ports operating in which two roles will forward traffic according to the IEEE 802.1w standard? (Choose two.)

A. alternate

B. backup

C. designated

D. disabled

E. root

7. What are two advantages of Layer 2 Ethernet switches over hubs? (Choose two.)

A. decreasing the number of collision domains

B. filtering frames based on MAC addresses

C. allowing simultaneous frame transmissions

D. increasing the size of broadcast domains

E. increasing the maximum length of UTP cabling between devices

8. Refer to the exhibit. The networks connected to router R2 have been summarized as a 192.168.176.0/21 route and sent to R1. Which two packet destination addresses will R1 forward to R2? (Choose two.)

A. 192.168.194.160

B. 192.168.183.41

C. 192.168.159.2

D. 192.168.183.255

E. 192.168.179.4

F. 192.168.184.45

9.Which command must you use to verify hostname-to-IP-address mapping information?

A. show mac-address-table

B. show sessions

C. show arp

D. show hosts

10. Refer to the exhibit. Which three statements are true about how router JAX will choose a path to the 10.1.3.0/24 network when different routing protocols are configured? (Choose three.)

A：By default, if RIPv2 is the routing protocol, only the path JAX-ORL will be installed into the routing table.

B：The equal cost paths JAX-CHI-ORL and JAX- NY-ORL will be installed in the routing table if RIPv2 is the routing protocol.

C：When EIGRP is the routing protocol, only the path JAX-ORL will be installed in the routing table by default.

D：When EIGRP is the routing protocol, the equal cost paths JAX-CHI-ORL, and JAX-NY-ORL will be installed in the routing table by default.

E：With EIGRP and OSPF both running on the network with their default configurations, the EIGRP paths will be installed in the routing table.

F：The OSPF paths will be installed in the routing table, if EIGRP and OSPF are both running on the network with their default configurations.

6-10：CE,BC,BE,D,ADE

第6题解析：题目考查的是 802.1w 也就是 RSTP。RSTP 定义了3 种状态：放弃、学习和转发。根或指定端口在拓扑结构中发挥着积极作用，而替代或备份端口不参与主动拓扑结构。在稳定的网络中，根和指定端口处于转发状态，替代和备份端口则处于放弃状态。

第7题解析：太简单了，不多赘述。

第8题解析：首先来看一下这个汇总地址 192.168.176.0/21 128 64 32 16 8 4 2 1 1 0 1 1 0 0 0 0= 176 掩码是21位。

从这个这个汇总地址，我们能得出被汇总地址的范围是192.168.176.1 – 192.168.183.254，192.168.183.255 是广播地址，通过以上分析我们可以马上选出答案 BE是正确的

第9题解析：A选项命令可以查看到mac地址表，B选项命令可以查看到会话和连接用户信息，C选项命令可以查看到arp解析条目，D选项命令可以看到主机名和IP地址的映射关系。

第10题解析：

此题考查的是 RIP、EIGRP、OSPF 的选路问题。默认情况下EIGRP 要优于OSPF 优于 RIP EIGRP 时支持负载均衡。等价于非等价都支持。

11. Which three statements are typical characteristics of VLAN arrangements? (Choose three.)

A. A new switch has no VLANs configured.

B. Connectivity between VLANs requires a Layer 3 device.

C. VLANs typically decrease the number of collision domains.

D. Each VLAN uses a separate address space.

E. A switch maintains a separate bridging table for each VLAN.

F. VLANs cannot span multiple switches.

12. Refer to the exhibit. A network administrator is adding two new hosts to SwitchA. Which three values could be used for the configuration of these hosts? (Choose three.)

A. host A IP address: 192.168.1.79

B. host A IP address: 192.168.1.64

C. host A default gateway: 192.168.1.78

D. host B IP address: 192.168.1.128

E. host B default gateway: 192.168.1.129

F. host B IP address: 192.168.1.190

11-12：BDE,ACF

第11题解析：

A：新交换机都有一个默认 vlan1，因此错

B：VLANs 之间的联通的需求是一个三层设备，正确。

C：VLANs 代表性的能降低冲突域的数量，错。

冲突域和 vlan没关系 ，vlan分割的是广播域，一个交换机端口就是一个冲突域。

D：每个 VLAN 使用分离的地址空间，正确

E：一个交换机在每个 VLAN 中保持存放一个分离的桥接

表，命令 show mac-address-table vlan 可以看见

F：VLANs 不能跨越多个交换机，错

第12题解析：此题考点又是单臂路由，以及 VLSM.不同的 vlan在不同网段， 路由器上的子接口 ip地址也应该和每个 vlan 在一个网段，并且其 ip地址应该是每个vlan的网关路由器的配置已经固定，那么主机的上的ip地址和网关配置就应该和路由器的配置保持一致。

host A 在交换机 6号口上，对应 Vlan10 查看右边的图可以看出其网关为192.168.1.78 因此答案C是正确的。

host B 在交换机 9号口上，对应 vlan20 ，查看右边的图可以看出其网关为192.168.1.130再来分析 host A host B 的IP 地址，肯定必须和他的网关在同一个网段上，这样我们很快就选出了答案。

整理：老杨丨9年资深网络工程师，更多网工提升干货，请关注公众号：网络工程师俱乐部