为了帮助广大考生系统全面的复习好《思科认证：CCNA认证学科》，我们考吧网整理了思科认证模拟试题，本次汇编的模拟试题希望对你的考试有所帮助，预祝你考试顺利。

推荐阅读：思科认证：CCNA认证考前经典试题训练汇总三

1、Based on the network provided in the exhibit, in these two areas, all routers are performing OSPF on all interfaces. After examining the OSPF database on PG-R4, do you know which type of LSA will contain 10.1.5.0/24, and which router will have originated it? 基于给出的网络，在两个区域里，全部的路由器全部的接口都运行OSPF，在检查 PG-R4的OSPF数据库后，你知道哪个类型的LSA包含了10.1.5.0/24，哪个路由器 有它的源?

A. 10.1.5.0/24 will be in a summary (type 3) LSA originated by PG-R3.

B. 10.1.5.0/24 will be in a router (type 1) LSA generated by PG-R3.

C. 10.1.5.0/24 will be in a network (type 2) LSA originated by PG-R3.

D. 10.1.5.0/24 will not be in any LSA in the OSPF database at PG-R4, because PG-R4 and PGR3 are in different areas.

Answer: A

2. Your company is researching a new application that runs over IPv6, but part of it must still have IPv4 support. Your company uses a traditional IPv4 network. Your plan is not to run IPv6 over the whole network, but to segment parts of the network or even to operate simultaneously with IPv6 and IPv4. You must make a brief presentation about IPv6 technology to the board of technical directors. Which three of these items could be part of your presentation? (Choose three.)

你的公司正在基于IPv6开始一种新的应用程序，但是这个应用必须兼容IPv4。你公司的在使 用IPv4的网络。你计划不用在整个网络都运行IPv6，只用在一部分网络同时运行IPv4和IPv6 你需要对董事会技术部门作出IPv6的技术的简要介绍。以下哪三个是您演示的主要内容。

A. Tunnel IPv6 over IPv4 to connect far-end IPv6 networks.

使用IPv6到IPv4网络隧道来连接IPv6的网络

B. Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is not possible. C. Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is possible.

说明为什么要在同一个接口配置IPv4和IPv6。 说明EUI-64和他的工作原理

D. What is the meaning of EUI-64 and how does it work? www.Examw.com

E. Tunnel IPv4 over IPv6 to connect far-end IPv4 networks.

Answer: ACD

3. Which statement correctly describes the disabling of IP TTL propagation in an MPLS network?

哪种说法正确地描述了MPLS网络中IP传输的TTL是禁用的

A. The TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSR. B. TTL propagation cannot be disabled in an MPLS domain. C. TTL propagation is only disabled on the ingress edge LSR. D. The TTL field of the MPLS label header is set to 255.

TTL失效是因为 MPLS的标签头的TTL字段设置为255

E. The TTL field of the IP packet is set to 0.

Answer: D

4. The core of a network has four routers connected in a square design with Gigabit Ethernet links using /30 subnets. The network is used to carry voice traffic and other applications. Convergence time is taking more than expected. Which three actions would you take to improve OSPF convergence time? (Choose three.)

一个核心网络，使用千兆线路地址用规划好的/30的子网来连接4台路由器。这个网络是承载 语音和其他服务的。网络的收敛时间非常慢，以下哪三个办法能提高OSPF协议的收敛速度。

A. Increase MTU of the interfaces to accommodate larger OSPF packets.

B. Change the network type to point-to-point on those links. 把线路类型改成点到点

C. Reduce SPF initial time

r. E. Enable OSPF.

Answer: BCE

5. Refer to the exhibit. BGP-4 routing to the Internet, in normal behavior, may create asymmetrical routing for different prefixes. The BGP routing table indicates that traffic should follow the paths indicated in the exhibit, but packets are not going further than the border router in AS 4. What could be the cause of this problem?

减少SPF算法的计时器

D. Increase hello interval to avoid adjacency flapping.

开始OSPF协议

如图所示，BGP协议运行在互联网络。在正常情况下，可以会造成不一致的路由前缀。BGP 路由表中应该只有最短路径的，但是在As4的包不能去更远的路由器了。什么问题造成这个 情况?

A. TCP Intercept is configured in AS 4.

B. Unicast Reverse Path Forwarding is configured in loose mode in this router.

C. Packets may be leaving AS 1 without the BGP routing flag set to 1.

D. Unicast Reverse Path Forwarding is configured in strict mode in this router.

单播反向路径转发在路由器上是严格配置的

E. There is a missing Unicast Reverse Path Forwarding configuration.

Answer: D