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H3C GB0-372 Exam Syllabus Topics:

H3CSE-RS-SW Sample Questions:

1. 在交换机 SWA 上执行 displayinterface Ethernet 1/0/1 命令后,输出信息如下:
[SWA] display interface Ethernet 1/0/1
Ethernet1/0/1 current state: UP
PVID: 10
Mdi type: auto
Link delay is 0 （ sec )
Port link-type: trunk
VLAN passing: 1 （ default vlan ), 10
VLAN permitted: 1 （ default vlan ), 2-4094
Trunk port encapsulation: IEEE 802.1q
Port priority: 0
从以上输出可以判断

A) 带有 VLAN10 标签的数据帧进入端口 Ethernet1/0/1 时不会被丢弃
B) 带有 VLAN20 标签的数据帧可以从端口 Ethernet1/0/1 转发出去
C) 端口 Ethernet1/0/1 是一个 Trunk 端口,允许所有 VLAN 的数据侦通过
D) 带有 VLAN1 标签的数据帧离开端口 Ethernet1/0/1 时会被剥离标签

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) 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
C) SWA 端口 EO/1 链路中断后不会向 SWC 发送 TCN BPDU
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. 某客户局域网中希望部署 802.1X 希望来完善接入安全性,同时客户希望通过端口安全特性来对端口收到的非法报文暂时关闭 5 分钟,以阻止非法用户访问网络,可以用到下列哪些特性实现

A) ntk temporary 特性
B) Trap 特性
C) InstrusionProtection 特性
D) NeedToKnow 特性

4. 在大型局域网中,常用的链路备份技术有

A) Smart Link
B) RRPP
C) 链路聚合
D) STP

5. 如图组网,交换机均运行 RSTP ,初始时 SWA 、 SWB 和 SWC 互连,当拓扑稳定后连接 SWB 和 SWD ,则下列说法正确的有

A) SWB 会在两倍的 Hello Time 时间内发送 TC 置位的 RST BPDU
B) SWB 会清除端口 E0/1 和 E0/2 学到的 MAC 地址并从这两个端口中发出 TC 置位的 RST BPDU
C) SWA 收到 TC 置位的 BPDU 后,会将 MAC 地址表全部清空,并从 E0/2 发送 TC 置位的 RST BPDU
D) SWC 收到 TC 置位的 BPDU 后,会将端口 E0/1 学到的 MAC 地址清空,并从该端口发送 TC 置位的 RST BPDU

Solutions: