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H3C GB0-392 Exam Syllabus Topics:

H3CSE-RS-NSO Sample Questions:

1. 对于畸形报文防御说法正确的有。

A) 针对 Teardrop 类的攻击,可以通过缓存分片信息,每一个源、目的 IP 、报文 ID 相同的构成一组,最大缓存 10000 组,在缓存数据达到最大时,直接丢弃分片,同时根据缓存的分片信息,分析 IP 报文分段的合法性,直接丢弃不合法的 IP 报文的方式来抵御攻击
B) 针对畸形 TCP 报文攻击,可以通过判断 TCP 报文标志位来判断报文是否为攻击报文,对于 6 个标志位全为 1 或 6 个标志位全为 0 或 SN 和 FIN 为同时为 1 的报文直接丢弃
C) 畸形报文攻击需要对每一种攻击进行针对性防御
D) 针对 ping of death 攻击,可以通过检测 Ping 请求报文的长度是否超过 65536 字节来辨别是否为攻击报文,若长度超过 65536 字节,则直接丢弃该报文

2. 当队列长度达到最大值后,报文将采用方式丢弃

A) RED
B) 按时间顺序,丢弃最先进入队列的报文
C) WRED
D) 尾丢弃

3. 通过命令可以显示 L2TP 会话信息。

A) display 12tp tunnel
B) display 12tp session
C) display 12tp status
D) display 12tp verbose

4. 用 PC 作为客户机,采用客户 LAC 模式通过 iNode 与 LNS 建立 L2TP 隧道,用户登录成功了,但无法正常通信,则出现此问题可能的原因为。（选择一项或多项)

A) LNS 对 LAC 认证不通过
B) 远程系统到 LNS 的公网传输不稳定
C) 用户名密码错误
D) tunnel 接口验证不通过

5. 若的每个队伍都对应一类报文,每个队列发送额度的比例为顺序增大,既 1 : 2 : 3 : .. :最大队列数,假设应用该调度的端口速度为 100Mbps ,则当每个队列对应的报文各以 20Mbps 的速度转发该端口拥塞后。
第 9 队列对应的报文可使用的宽带大约为

A) 6.62%
B) 7.35%
C) .5.92%
D) 6.58%

Solutions: