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H3C GB0-392 Exam Syllabus Topics:

H3CSE-RS-NSO Sample Questions:

1. ZLB （ Zero-Length Bod )消息是一个只有 L2TP 头的控制消息,其作用是作为一个明确应答,以确保控制消息的可靠传递。
以下四种情况中, LNS 不发送 ZLB 消息给 LAC 作为应答的有。

A) LNS 收到 LAC 发连的 StopCCN （ scop-Control-Connection-Notiflcation )；消息后
B) LNS 收到 LAC 发送的 Hello 控制消息后
C) LNS 收到 LAC 发送 CDN （ Call-Disconnect-Notif ,呼叫断开通知)消息后
D) LNs 收到 LAC 发连的 ICCN （ Incoming-Call-Connectea ,呼叫已连接)消息后

2. 在 MSR 路由器上执行命令,输出如下信息:
Interface: GigabitEthernet0/1
Output queue: （ Urgent queuing: Size/Length/Discards ) 0/100/0
Output queue: （ Protocol queuing: Size/Length/Discards ) 0/500/0
Output queue: （ Priorit queuing: PQL 1 Size/Length/Discards )
Top: 3/20/42878 Middle: 10/40/0 Normal: 60/60/259195 Bottom: 80/80/344297
则以下说法中不正确的是

A) PQ 队列调度没有生效, Top 流量有丢包
B) PQ 队列调度没有生效, Top 流量无丢包
C) PQ 队列调度生效, Middle 流量无丢包
D) PQ 队列调度没有生效, Middle 流量无丢包
E) PQ 队列调度生效, Top 流量有丢包
F) PQ 队列调度生效, Top 流量无丢包

3. SIP UA 通过代理服务器呼叫被叫的过程中 , 。

A) 以上都不对
B) 代理服务器帮助获取被叫 UA 位置后,主叫 UA 直接向被叫 UA 发起呼叫
C) 主叫 UA 的所有消息都通过代理服务器进行转发
D) 除了位置请求消息外,主叫 UA 的其它消息都不需要通过代理服务器转发

4. 在 PPPoE 应用中 , 接入端的以太网 MAC 地址在 PPPoE 的阶段确定。（请填写英文)

5. 对于畸形报文防御说法正确的有。

A) ping of death 攻击是利用超大尺寸的报文进行攻击的
B) 畸形 TCP 报文攻击是通过将 TCP 的标志设置为特定数值的报文进行攻击的
C) Teardrop 类的攻击利用 UDP 包重组时重叠移动的漏洞来进行攻击的
D) 要防御畸形报文攻击,需要对每一种攻击的特点进行针对性防御

Solutions: