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H3C GB0-371 Exam Syllabus Topics:

H3C Constructing H3C High-Performance Campus Networks Sample Questions:

1. 关于优先级的映射和优先级的信任,说法正确的有

A) 报文进入交换机端口后,默认会根据端口的优先级进入队列
B) 报文进入交换机端口后,会默认根据 DSCP 的优先级进入队列
C) 报文进入交换机端口后,会默认根据 802.1P 的优先级进入队列
D) 报文进入交换机后,如果要根据 802.1P 或 DSCP 值入队列,则必须配置端口信任 802.1P 或 DSCP

2. 关于 RSTP 中的指定端口快速切换机制,说法正确的有

A) 指定端口收到 Proposal 位置位的 RST BPDU ,并缺点本端口为跟端口后,该端口将发送 Agreement 位置位的 RST BPDU
B) 同步过程的目的是在网桥本地消除环路产生的可能,同步过程中需要阻塞所有指定端口
C) 当 RSTP 中的指定端口处于 Discarding 状态时会发送 Proposal 位置位的 RSTBPDU
D) 指定端口快速切换机制必须在点到点链路

3. 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 E0/1 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
B) SWB 的端口 E0/1 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
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) SWA 端口 E0/1 链路中断后不会向 SWC 发送 TCN BPDU

4. 客户的局域网交换机 SWA 双上行连接交换机 SWB 和交换机 SWC ,通过 SmartLink 保证链路可靠性 SWA 交换机有如下配置:
[SWA-smlk-group1]smart-link flush enable control-vlan 10
SWB 交换机有如下配置 ?
[SWB-GigabitEthernet1/0/1]smart-link flush enable control-vlan 100
SWC 交 i 机有如下配置:
[SWC-GigabitEthernet1/0/1]smart-link flush enable control-vlan 100
如果交换机 SWA 交换机 SWB 交换机 SWC 互连接口允许所有 VLAN 通过,从上述信息可以得知

A) 更改 SWB 交换机、 SWC 交换机接收控制 vlan 为 10 , SWB 交换机、 SWC 交换机通过流量刷新 MAC 和 ARP
B) 更改 SWB 交换机、 SWC 交换机接收控制 VLAN 为 10 ,则 SWA 交换机 SmartLink 备份功能可正常实现
C) 不更改配置,则 SWA 交换机 SmartLink 备份功能无法实现
D) 不需要修改任何配置, SWA 交换机 SmartLink 备份功能可实现

5. 如图组网, SWA 和 SWD 启用 RSTP ,而 SWB 和 SWC 没有启用生成树协议,则下列说法正确的有

A) 当 SWB 的端口 E0/2DOWN 掉后, SWD 的端口 E0/2 会成为新的根端口并立即进入转发状态
B) 当 SWB 的端口 E0/2DOWN 掉后, SWD 的端口 E0/2 会等待 3 个 Hello Time 后才会成为新的根端口并进入转发状态
C) SWD 将会有一个端口的角色为 Alternate
D) 由于 SWB 和 SWC 没有启用生成树协议,所以当 SWD 的根端口 DOWN 掉后, Alternate 端口不能马上成为新的根端口并进入转发状态

Solutions: