H3CSE-RS-NSO : GB0-392

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H3C GB0-392 Exam Syllabus Topics:

H3CSE-RS-NSO Sample Questions:

1. 当 ONU 端口的链路类型为 Access ,其对上行报文的处理方式为。

A) 仅允许带有缺省 VLAN tag 的报文通过,并去 Tag
B) 只允许不带 tag 的报文通过,并为报文添加缺省 VLAN 的 tag
C) 仅允许带 tag 的报文通过
D) 对于收到的不带 Tag 的报文,添加缺省 VLAN tag ,对于收到的带 tag 的报文,直接转发

2. BGP MPLS VPN 组网中, RT 值存在于下列哪个位置。

A) PE 转发给 CE 的私网报文中
B) PE 转发给 P 设备的私网报文中
C) PE 之间交互的路由撤销消息中
D) PE 之间交互的路由更新消息中

3. 关于 VoIP 电话系统中的回声,下列描述哪些是正确的 ?

A) 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
B) 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。
C) 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。
D) 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。

4. 对于应用层攻击防御说法正确的是。

A) 应用层攻击防御一般的网络设备可以完成
B) 应用层攻击防御可以采用固定的策略一劳永逸地完成
C) 应用层攻击防御需要实时更新攻击特征库
D) 应用层攻击防御需要采用专业的安全设备来完成

5. 在以太网接入应用中,关于运行商接入网边缘的接入点 AN 和汇聚设备 AGG 部署说法正确的有。

A) AN 采用三层交换机时,相对于二层交换机更加有助于控制广播域的范围
B) AN 采用二层交换机时,相对于三层交换机可队实现更高密度的终端用户接入
C) AN 采用三层交换机时,一台 AGG 设备最多可接用户终端数将不再受限于其自身 MAC 地址表项数
D) AN 采用二层交换机时,在 AN 和 AGG 上需要支持和部署复杂的二层隔离和安全特性

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