Huawei H12-731-CN

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Huawei HCIE-Security (Huawei Certified Internetwork Expert-Security) (H12-731中文版) Sample Questions:

1. 内部网络安全,关于规划部署建议优先考虑项有以下哪些选项 ?

A) 开启 NAT 功能
B) 开启 DDoS 功能
C) 防火墙和交换机虚拟化实现业务隔离
D) 计算网络和存储网络物理隔离
E) 应用三层架构平面隔离

2. 关于 MTU 和 PMTU 说法正确的是 ?

A) MTU （ Maximum Transfer Unit )指的是在网络中能够传输的最大数据报文的大小,以字节为单位。
B) 探测 PMTU 是通过探测获取指定目的 IPv4 地址的 PMTU 值,然后使用 MTU 值来发送报文。
C) 在 IP 网络中,从源地址到目的地址可能会经过具有不同 MTU 值的接口,其中最大的 MTU 值即为该路径的 PMTU 。
D) 设备会在入接口检查 MTU ,如果数据包大小超过 MTU 值,将被丢弃。

3. 在 IPsec 协商失败的过程中,打开 IKE 的调试开关,显示如下信息: got NOTIFY of type NO_PROPOSAL CHOSEN 或 drop message from A.B.C.D due to notification type NO_PROPOSAL CHOSEN ,应该如何处理 ?

A) 如果是第二阶段没有协商成功,可能是 ACL 没有匹配。
B) 如果第一阶段没有协商成功,可能配置的 pre-share-key 不对。
C) 如果是第二阶段没有协商成功,可能是 ipsec 提议没有匹配。
D) 如果第一阶段没有协商成功,可能是 ike 提议不匹配。

4. 某局点微信语音（ TCP )业务出现延时较大的故障,延时达到 3 秒。防火墙作为其出口 NAT 网关,配置了 easy-ip 的 nat 方式（单出口),关闭了链路状态检测, TCP 老化时间为 30 秒,业务流量较小,到语音服务器的会话数接近 5 万。通过会话可以看到大量的单向访问语音服务器的报文。
造成这一故障的原因及解决方案正确的是 ?

A) TCF 会话老化时间太短,防火墙新建会话比较耗时。
B) 防火墙会话老化后,新的连接做 NAT 后的端口与原来和服务器建立连接的端口不一致,导致服务器没有响应,需要客户端超时后再重新建立连接才能发送数据。
C) 如果链路不存在来回路径不一致,可以开启链路状态检测功能,老化时间默认,可以解决这一问题。
D) 解决方案可以 TCP 老化时间增加到 600 秒。

5. 下列属于应用层攻击的是:

A) 缓冲区溢出
B) CC 攻击
C) Teardrop 攻击
D) Smurf 攻击

Solutions: