H3C GB0-371

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H3C Constructing H3C High-Performance Campus Networks Sample Questions:

1. 如图所示组网中, RT1 、 RT2 和 RT3 之间运行 PIM SM 协议, RP 为 1.1.1.1RT3 上连有接收者,且在相应接口上使能 IGMP 在 RT3 査看单播路由表如下:
[RT3]display ip routing-table
Routing Tables: Public
Destinations : 10 Routes : 10
Destination/MaskProtoPreCost NextHop Interface
1.1.1.1/320SPF 10 1562 192.168.2.1 so/2/1
127.0.0.0/8 Direct 00127.0.0.1 InLoopO
127.0.0.1/32Direct 00127.0.0.1 InLoopO
192.168.0.0/30Direct 00192.168.0.2 S0/2/0
192.168.0.1/32Direct 00192.168.0.1 S0/2/0
192.168.0.2/32Direct 00127.0.0.1 InLoopO
192.168.1.0/300SPF 10 3124 192.168.2.1 so/2/1
192.168.2.0/30Direct 00192.168.2.2 so/2/1
192.168.2.1/32Direct 00192.168.2.1 so/2/1
192.168.2.2/32Direct 00127.0.0.1 InLoopO
那么,当接收者（ Receiver )发送组加入请求后,下列哪些路由器上存在（ * , G )表项

A) RT2
B) RT3
C) RT1

2. 关于 RSTP 和 STP 的 BPDU 处理方式的对比,说法正确的有

A) RSTP 沿袭了 STP 中配置 BPDU 的发送方式,配置 BPDU 仅由根桥周期性发出
B) RSTP 交换机收到配置 BPDU 后,对优先级向量的计算、比较方法和 STP 相同
C) RSTBPDU 的老化时间由 Max age 减少为 3 个连续的 Hello Time 时长
D) RSTP 中,处于阻塞状态的端口在收到地优先的 BPDU 时,可以立即做出回应

3. 生成树配置中的 stp mcheck 命令,说法正确的有

A) 通过在 RSTP 或 MSTP 交换机端口上运行该命令,可以将端口的生成树描述切换到 STP
B) 该命令用于 RSTP 交换机和 MSTP 交换机互联时使用
C) 该命令在不同厂商的交换机互连,且运行 MSTP 时使用,用于检查摘要信息
D) 该命令用于运行 RSTP 或 MSTP 的交换机端口连接 STP 设备时使用

4. 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) 路由器无本地直连组播接收者时,会向所有 PIM 邻居发送 Prune
B) 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
C) Assert （断言)失败的一方会向获胜一方发送
D) 路由器（ S , G )表项中出接口列表为空时,会向所有 PIM 邻居发送 Prune 消息

5. 交换机的 MAC 地址表项可能包含下列哪些要素 -

A) 老化时间
B) MAC 地址
C) 端口号
D) IP 地址
E) VLANID

Solutions: