H3C GB0-191

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

1. 在路由器的路由表中有一条默认路由,其目的网段和掩码都是 0.0.0.0 ,而其下一跳是路由器的 S0/0 接口,那么下列关于此路由的描述正确的是 ______ 。（多选)

A) 这条路由的度量值有可能是 3
B) 当路由器收到去往目的地址 120.1.1.1 的数据包时,如果路由器表中没有其他确切匹配项,那么该数据包将匹配此默认路由
C) 该路由的掩码最短,因此只有在没有其它路由匹配数据包的情况下,数据包才会按照默认路由转发
D) 这条路由的优先级有可能是 100

2. 在一台帧中继 DTE 设备与帧中继交换机之间可能运行如下哪种协议 ?

A) PVC
B) DLCI
C) SVC
D) LMI

3. 下面关于 OSI 参考模型各层功能的说法正确的是 ______ 。（多选)

A) 网络层决定传输报文的最佳路由,其关键问题是确定数据包从源端到目的端如何选择路由。
B) 物理层涉及在通信信道（ Channel )上传输的原始比特流,它定义了传输数据所需要的机械、电气功能及规程等特性。
C) 传输层的基本功能是建立、维护虚电路,进行差错校验和流量控制。
D) 应用层负责为应用程序提供网络服务。
E) 会话层负责数据格式处理、数据加密等。

4. 路由器 MSR-1 分别与 MSR-2 、 MSR-3 互连,其中在 MSR-1 的路由表中有一条从 MSR-2 学到的去往目的网段 120.10.12.0/24 的 RIP 路由,其 Cost 为 3 ；此时 MSR-1 从 MSR-3 上也接受到一条依然是去往目的网段 120.10.12.0/24 的 RIP 路由,其 Cost 为 15 ,那么 ______ 。

A) MSR-1 的路由表不会更新,因为 Cost 为 15 的 RIP 路由意味着不可靠路由, RIP 不会将其写入自己的路由表
B) MSR-1 的路由表会更新,因为 Cost 为 15 的 RIP 路由意味着网络可能有环路
C) MSR-1 的路由表不做更新,依然保留从 MSR-2 学习到的该网段路由
D) MSR-1 的路由表会更新为从 MSR-3 上学到 Cost 为 15 的路由

5. 交换机上的以太帧交换依靠 MAC 地址映射表,这个表可以通过 ______ 来建立。（多选)

A) 生成树协议交互学习
B) 交换机之间相互交换目的地的位置信息
C) 手工添加映射表项
D) 交换机自行学习

Solutions: