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H3CSE-RS-SW Sample Questions:

1. 下列技术中属于三层组播技术的有

A) PIM
B) MVR
C) IGMP
D) IGMPSnooping

2. 关于配置 BPDU 和 TCNBPDU ,说法正确的有

A) Alternate 端口既不会发送配置 BPDU 也不会发送 TCNBPDU
B) 配置 BPDU 通常仅由根桥周期性发出, TCNBPDU 除根桥外其他网桥都可能发出
C) 配置 BPDU 通常仅从根端接收, TCNBPDU 仅从指定端口接收
D) 配置 BPDU 仅从指定端口发出, TCNBPDU 仅从根端口发出

3. 如图组网, SWA 和 SWB 启用 STP SWC 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 数据传送业的恢复过程的说法正确的有（假设 PCA 不会主动发送数据)

A) 由于 SWA 链路中断会引发拓扑改变处理过程,使得 SWA 和 SWB 的 MAC 地址老化时间缩短,所以业务恢复默认需要 15 秒时间
B) 当 SWB 的端口 EO/1 进入 Forwarding 状态会引发拓扑改变处理过程,所以业务最终恢复需要默认 30+15=45 秒的时间
C) 业务恢复需要等待 SWC 的 MAC 地址老化,所以需要默认 300 秒的时间
D) 由于 SWB 的端口 EO/1 默认需要 30 秒的时间进入转发状态,所以业务需要默认 30 秒的时间才能恢复

4. 下列关于 STP 协议的说法,正确的有

A) 如果 STP 网络中存在大量的主机,则主机的频繁上下线会产生大量的 TCN BPDU
B) STP 网络中所有的 VLAN 共享一颗生成树,无法实现不同 VLAN 在 Trunk 链路上的负载分担
C) 当拓扑变化频繁时,会导致一些端口经常处于 Blocking 状态,可能会造成网络长期的中断
D) STP 中的端口从 Blocking 到 Forwarding 必须经过两个 ForwardDelay 的时长,此后才可以发送数据

5. 在如图所示的交换网络中,交换机 SWA 上设置 VLAN 10 为 Super VLAN , VLAN2 和 VLAN3 为 VLAN 10 的 Sub VLAN ,端口 Ethernet1/0/3 为 Trunk 端口, PVID 为 VLAN1 ,允许所有 VLAN 通过；交换机 SWB 上创建 VLAN2~VLAN20. 端口 Ethernet/0/4 为 Trunk 端口, PVID 为 VLAN1 ,允许所有 VLAN 通过,按照如图所示设置好各设备的 IP 地址后,下面说法正确的是

A) PCC 的报文从 SWB 的 Ethernet1/0/4 端口出来,进入 SWA 的 Ethernet1/0/3 端口后所带的 vlan tag 为 VLAN 1
B) PCC 的报文从 SWB 的 Ethernet1/0/4 端口出来,进入 SWA 的 Ethernet1/0/3 端口后所带的 vlan tag 为 VLAN 3
C) PCC 的报文从 SWB 的 Ethernet1/0/4 端口出来,进入 SWA 的 Ethernet1/0/3 端口后所带的 vlan tag 为 VLAN 2
D) PCC 的报文从 SWB 的 Ethernet1/0/4 端口出来,进入 SWA 的 Ethernet1/0/3 端口后所带的 vlan tag 为 VLAN 10

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