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Exam Code: SU0­121 Vendor: HDI Exam Name: Huawei Cert Datacom Pro­ Building Carrier Access Network Cert Name: HCSE/

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Huawei SU0-121

Exam Name: Huawei Cert Datacom Pro-Building Carrier Access Network

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Question: 1. 选出下列关于GVRP协议的叙述中错误的选项?

A. GVRP基于GARP的工作机制，维护交换机中的VLAN动态注册信息 B. GVRP是Generic Virtual Router Protocol的缩写 C. GVRP传播的VLAN注册信息包括本地手工配置的静态注册信息和来自其它交换机的动态注册 信 息

Answer: B Question: 2.

VLAN标记中包含有（ ）比特用于标识数据帧所属的VLAN A. 4 B. 32 C. 12 D. 8

Answer: C Question: 3. 运行GVRP协议时，如果处于同一组环境中的交换机的定时器配置不同，将会引起学习不稳定 的问题。 A. TruE. B. False

Answer: T Question: 4.

Isolate-user-vlan和Secondary vlan的映射关系建立后，可以直接执行删除Secondary vlan的操作。 T. TruE. F. False

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Answer: F Question: 5. 交换机的Trunk端口发送数据帧时，不检查数据帧中携带的VLAN ID，直接将数据帧透传。 TruE. False

Answer: F Question: 6. 如下图所示组网与配置，LS1、LS2、LS3的互连端口1、4、5、6配置为Trunk端口并允许所有 VLAN通过，且都启动了GVRP协议。 其中，端口 1 的GVRP注册类型配置为Fixed，端口4、5、6的GVRP注册类型配置为Normal。在LS1上配置有 VLAN 5 、VLAN 6，在LS3上配置有VLAN 6 、VLAN 7。 假设一切配置都正常的情况下，使用display interface命令查看端口1、4、5、6，以下关于各端口信息描述正确的是?

A. Port 1：vlan passing 5-7 B. Port 4：vlan passing 5-6 C. Port 5：vlan passing 5-7 D. Port 6：vlan passing 6-7

Answer: B Question: 7. 广播风暴是如何产生的？ Page |3 Page |3

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A. 大量ARP报文产生 B. 存在环路的情况下，如果端口收到一个广播报文，则广播报文会复制从而产生广播风暴 C. 站点太多，产生的广播报文太多 D. 交换机坏了，将所有的报文都广播

Answer: B Question: 8. 以下关于生成树协议处理链路故障的说法错误的是？ A. 链路失去连通性对用户来说就是无法正常通讯，所以对生成树协议来说，其首要目的是防止链 路失去连通性。即临时回路可以让其发生，但绝对不能让链路失去连通性。 B. 由于链路故障在网络中传播有一定的延迟，所以为了防止临时回路的产生，生成树协议引入了 一个中间状态即Learning状态。 C. 为了防止临时回路的产生，生成树协议在将端口由阻塞状态迁移到转发状态时，需要一定的时 间延迟。 D. 生成树协议无法避免链路会临时失去连通性。

Answer: A Question: 9.

RSTP网络环境中，华为交换机在默认情况下，如果一个已经被配置为边缘端口的端口收到了一 个其它交换机端口发出的BPDU报文，则该端口会重新变为非边缘端口。 TruE. False

Answer: T Question: 10.

RSTP计算过程中，当端口收到一个RST BPDU之后，首先为此RST BPDU生成一个消息优先级向量 （Message Priority Vector），然后使用消息优先级向量（Message Priority Vector）和端口优先级向量（Port Priority Vector）比较。

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TruE.

False

Answer: T Question: 11.

RSTP中，交换机初始化时，根优先级向量（Root Priority Vector）和交换机优先级向量（Bridge Priority Vector）相同。 TruE. False

Answer: T Question: 12. 多生成树协议（MSTP）中，关于Master端口的描述正确的是?

A. Master端口一定也是CIST上的根端口 B. 如果CST的根端口所通过的VLAN中，有属于非0的MST Instance的VLAN，则该端口为Master端口 C. Master端口一定位于CIST Regional Root上 D. Master端口一定是CIST Regional Root位于CIST的根端口

Answer: ABCD Question: 13.

MSTP 中，非0的MST Instance的根交换机和RSTP的根交换机一样，是整个交换网络的根交换 机。 TruE. Page |5 Page |5

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False

Answer: F Question: 14.

PPP的哪一个阶段主要是发送一些配置报文来配置数据链路，这些配置的参数不包括网络层协 议所需的参数。当完成数据报文的交换后，则会继续向下一个阶段跃迁。 A. 链路不可用阶段 B. 链路建立阶段 C. 验证阶段 D. 网络层协议阶段

Answer: B Question: 15. 下面哪个功能是PPP中的LCP协议所实现的 A. 保持多条链路 B. IP地址协议 C. IPX地址协议 D. 建立、保持和中断点到点的连接

Answer: B Question: 16. 如图所示两台路由器通过串口相连，且采用PAP认证方式，以下哪个命令是在必须在认证方配 置的？ A. local-user huawei password simple hello B. ppp authentication-mode chap C. local-user huawei service-type ppp D. ppp chap user huawei E. ppp chap password cipher hello

Answer: AC

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Question: 17. 服务器端收到了客户端发送的PADR报文后，会通过以下哪个报文响应并唯一标识这条连接 A. PADO B. PADR C. PADS D. PADT

Answer: C Question: 18.

Radius协议使用的端口号常见的有 A. 1646 B. 1645 C. 1812 D. 1813

Answer: ABCD Question: 19.

MA5200G用户身份从较低级别切换到较高级别时使用su命令切换而且要输入密码。 True False

Answer: T Question: 20.

MA5200G以下哪些业务需要配置并引用虚模板（Virtual-template）?

A. PPPOE B. PPPOA C. IPOEOA D. PPPOEOA

Answer: ABD Page |7 Page |7

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