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H3C GB0-372 Exam Syllabus Topics:

H3CSE-RS-SW Sample Questions:

1. 下列对交换机 MAC 地址表学习过程的描述正确的是。（选择 - 项或多项)

A) 交换机定期主动向 PC 机发送 MAC 地址探测报文
B) PC 会定期主动向交换机发送 MAC 地址报文
C) 当网络中某台 PC 发出数据帧时,交换机记录其中的源 MAC 地址
D) 当交换机收到某台 PC 的 ARP 应答报文时,会记录其中的源 MAC 地址

2. 如图组网, SWB 和 SWC 启用 STP SWC 为根, SWA 没有启用 STP 初始时链路 2 没有连接, PCB 可以将数据发到 PCA ,如果此时链路 1 故障,维护人员将链路 2 连接,则关于 PCB 到 PCA 数据传送业务的恢复过程说法正确的有（假设 PCA 不会主动发送数据)

A) SWB 的端口 EO/1 需要等待默认 30 秒进入转发状态,所以 PCB 到 PCA 的业务恢复总共需要默认 30 秒的时间
B) SWA 端口 EO/1 链路中断后不会向 SWC 发送 TCN BPDU
C) 由于 SWA 没有启用 STP ,所以业务恢复需要等待 SWC 的 MAC 地址老化,默认需要 300 秒的时间
D) SWB 的端口 EO/1 进入 Forwarding 状态引发拓扑改变过程,使得 MAC 地址老化时间缩短,所以 PCB 到 PCA 的业务恢复总共需要默认 45 秒的时间

3. 图示是 RRPP 的组网应用客户局域网交换机 SWA 、 SWB 、 SWC 、 SWD 上构成 RRPP 环主环 1 ,交换机 SWB 、 SWC 和 SWE 构成子环 2 ,交换机 SWB 、 sWC 和 sWF 构成子环 3 如果交换机 SWE 为子环 2 的主节点, SWF 为子环 3 的主节点从上述信息可以得知

A) 如果把子环 2 和子环 3 加入同一个环组,环组应分别配置在交换机上 SWB 、 SWC 、 SWE 、 SWF 并且配置应该一致
B) 如果把子环 2 和子环 3 加入同一个环组,环组中的子环 2 和子环 3 ,其边缘节点和辅助边缘节点可以不同
C) 无法把子环 2 和子环 3 加入同一个环组中
D) 如果把子环 2 和子环 3 加入同一个环组,环组中的子环 2 和子环 3 ,其边缘节点和辅助边缘节点所对应的主环链路应该 - 致

4. 如图组网,开始 SWA 和 SWB 之间没有连接, SWA 和 SWB 启用 RSTP 当拓扑稳定后,连接 SWA 和 SWB 的端口 E1/0/1 ,假设 SWA 将成为新的根桥,则下列说法正确的有

A) SWB 在收到 SWA 发送的 Proposal 消息,会立即回复 Agreement 消息
B) SWA 和 SWB 的端口 E1/0/1 会发送 Proposal 消息,请求进入转发状态
C) SWB 不需要自行生成 BPDU ,其回应的 Agreement 消息内容拷贝自 SWA 发送的 Proposal 消息
D) SWB 在收到 SWA 发送的 Proposal 消息,会启用同步过程将旧的根端口、指定端口以及边缘端口阻塞

5. 在 PIM-DM 组网中,关于路由器发送 Prune （剪枝)消息,描述正确的有

A) 路由器 RPF 接口收到 Prune 消息后,从此将不在此接口接收相应组播组的报文
B) 路由器无本地直连组播接收者时,会向上游 RPF 邻居发送 Prune 消息
C) Assert （断言)失败的一方会向获胜 - 方发送 Prune
D) 路由器（ S , G )表项中出接口列表为空时,会向上游 RPF 邻居发送 Prune 消息
E) 路由器接口收到 Prune 消息后,从此将不在此接口发送相应组播组的报文

Solutions: