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H3CSE-RS-NSO Sample Questions:

1. 关于 VoIP 电话系统中的回声,下列描述哪些是正确的 ?

A) 语音网关设备在执行模数转换时可能会引入回声,但可以在语音网关中配置回声抑制功能降低这种影响。
B) 语音网关设备本身并不带来新的回波,但由于 IP 网络带来网络时延,加大了回波时延,导致原来感觉不到的回波,在 VoIP 网络中变成能被感觉的回声。
C) VoIP 网络,回声与编码的选择有关系,压缩比越大的编码在网络中相对回声越大。
D) 回声分为电学回声和声学回声,传统的电话系统中的电学回声主要是由于二、四线换阻抗不匹配引起的

2. VoIP 网络中 , VAD 技术所节约的宽带与下列哪些因素有关 ?

A) 网络拥塞程度
B) 说话者的语言和特征
C) 选用的信令类型
D) 选用的编码类型

3. 配置 QoS Polic 时应执行以下哪些配置步骤 ?

A) 配置宽带
B) 配置行为
C) 配置分类器
D) 配置策略

4. B. GP MPLS VPN 网络中, P 设备上存在下列哪些表项。

A) 私网标签转发表
B) 私网路由表
C) 公网路由表
D) 公网标签转发表

5. 在 SIP 网络中,当重定向服务器收到主叫 UA 发送的会话请求消息后,

A) 重定向服务器直接将收到的主叫 UA 会话请求消息转发给被叫 UA
B) 重定向服务器查找被叫 UA 的位置信息,然后将其返回给主叫 UA
C) 主叫 UA 的所有消息都通过代理服务器进行转发
D) 重定向服务器查找被叫 UA 的位置信息,并向该位置发起会话请求

Solutions: