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H3C Constructing H3C High-Performance Campus Networks Sample Questions:

1. 关于 POE 系统,说法正确的有 ______ 。

A) POE 系统包含 PSE 设备和 PD 设备两部分,其中 PD 为供电设备, PSE 为受电设备
B) 通常 PSE 可以支持 mid-span 和 end-span 两种方法, PD 只能支持一种
C) POE 通常采用 min-span 和 end-span 两种供电方法
D) POE 电源提供的电压为 48V ,输出功率不超过 13W

2. 如图所示的网络中,交换机 SWA 为二层交换机,路由器 RTA 为各 PC 的网关在路由器 RTA 上做了如下配置:
[RTA]interface Ethernet 0/0.1
[RTA-Ethernet0/0.1]ip address 10.10.10.1 255.255.255.0
[RTA-EthernetO/0.1 ]vlan-type dotlq vid 1
[RTA-Ethernet0/0.1 Jinterface ethernet 0/0.2
[RTA-Ethernet0/0.2]ip address 20.20.20.1 255.255.255.0
[RTA-Ethernet0/0.2]vlan-type dotlq vid 2
[RTA-Ethernet0/0.2]interface ethernet 0/0.3
[RTA-Ethernet0/0.3]ip address 30.30.30.1 255.255.255.0
[RTA-Ethernet0/0.3]vlan-type dotlq vid 3
交换机 SWA 上完成相配置后, PCA 、 PCB 和 PCC 都可以 ping 通自己的网关,下面关于交换机 SWA 端口 Ethernet1/0/4 正确的是（选择一项或多项)

A) interface Ethernet1/0/4 port link-mode bridge port link-type trunk port trunk permit vlan all port trunk pvid vlan 3
B) interface Ethernet 1/0/4 port link-mode bridge port link-type trunk port trunk permit vlan all port trunk pvid vlan 10
C) interfaceEthernet1/0/4 port link-mode bridge port link-type trunk port trunk permit vlan all port trunk pvid vlan 2
D) interfaceEthernet1/0/4 port link-mode bridge port link-type trunk port trunk permit vlan all

3. 路由器运行 IGMPV2 协议,其直连局域网中的主机收到的 Query 报文中 GroupAddress 可能为（选择一项或多项)

A) 0.0.0.0
B) 224.0.0.2
C) 255.255.255.255
D) 225.1.1.1
E) 224.0.0.1

4. 关于 MSTP 的 BPDU 格式,说法正确的有

A) 如果将 MST 域看作逻辑上运行 RSTP 的交换机,则 CIST 域根 ID 即相当于该 RSTP 交换机的指定桥 ID ,通常该 ID 为 MST 域内值最小的桥 ID
B) 计算 CST 仅需要 RSTBPDU 字段的值即可
C) 如果将 MST 域看作逻辑上运行 RSTP 的交换机,则 CIST 外部路径开销即相当于该 RSTP 交换机的根路径开销
D) MSTP 的 BPDU 由 RSTBPDU 字段和 MST 专有字段组成

5. 当路由器收到组播数据后,査找组播转发表

A) 如果组播转发表中存在对应的（ S , G )表项,且该报文实际到达的接口与表项中入接口相匹配,路由器转发组播数据
B) 如果组播数据 RPF 接口与（ S , G )表项中的入接口不符,路由器会将表项的入接口更新为检査得到的 RPF
C) 如果组播转发表中不存在对应的（ S , G )表项,路由器丢弃组播数据
D) 如果组播转发表中存在对应的（ S , G )表项,但该报文实际到达的接口与表项中入接口不匹配,路由器丢弃组播数据

Solutions: