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H3C Constructing Small - and Medium - Sized Enterprise Network Sample Questions:

1. 在客户的路由器 MSR 30 上查看到如下 debug 信息:
*0.87831022 IP/8/debug_icmp:
ICMP Receive: ttl-exceeded(Type=11, Code=0), Src = 3.3.3.1, Dst = 3.3.3.2; Origi
nal IP header: Pro = 1, Src = 3.3.3.2, Dst = 20.1.1.1, First 8 bytes = 080081FF
ABD40004
*0.87833017 IP/8/debug_icmp:
ICMP Receive: ttl-exceeded(Type=11, Code=0), Src = 3.3.3.1, Dst = 3.3.3.2; Origi
nal IP header: Pro = 1, Src = 3.3.3.2, Dst = 20.1.1.1, First 8 bytes = 08007A2E
ABD40005
据此可以推测 ______ 。

A) 该 ICMP 报文的目的地址为 20.1.1.1
B) 在 IP 地址为 3.3.3.2 的路由器上执行了命令 ping 20.1.1.1
C) 该 ICMP 报文的目的地址为 3.3.3.2
D) 可能有路由环路,因为信息显示 ttl-exceeded

2. 关于 STP 协议说法正确的是 ______ 。（多选)

A) H3C 以太网交换机的默认优先级值是 32768
B) BridgeID 值由网桥的优先级和网桥的 MAC 地址组合而成。前面是 MAC 地址,后面是优先级。
C) 优先级相同时, MAC 地址越大优先级越高
D) 优先级值越大优先级越低
E) BridgeID 值小的将被选为根桥

3. 客户在路由器上要配置两条去往同一目的地址的静态路由,实现互为备份的目的。
那么关于这两条路由的配置的说法正确的是 ______ 。

A) 需要为两条路由配置不同的 Priority
B) 需要为两条路由配置不同的 Preference
C) 需要为两条路由配置不同的 MED
D) 需要为两条路由配置不同的 Cost

4. 关于 STP 、 RSTP 和 MSTP 说法正确的是 ______ 。（多选)

A) MSTP 可以弥补 STP 和 RSTP 的缺陷,它既能快速收敛,也能使不同 VLAN 的流量沿各自的路径转发,从而为冗余链路提供了更好的负载分担机制。
B) STP 不能快速收敛,当网络拓扑结构发生变化时,原来阻塞的端口需要等待一段时间才能变为转发状态。
C) MSTP 兼容 STP 和 RSTP 。
D) RSTP 是 STP 协议的优化版。端口进入转发状态的延迟在某些条件下大大缩短,从而缩短了网络最终达到拓扑稳定所需要的时间。

5. DNS 可以采用的传输层协议是 ______ 。

A) UDP
B) TCP 或 UDP
C) TCP
D) NCP

Solutions: