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H3CSE-RS-NSO Sample Questions:

1. GRE 协议封装的报文中,载荷协议为 IPX 协议,承载协议为 IP 协议,该报文从链路层到载荷数据的封装顺序为。

A) 链路层 GRE IPX IP 载荷数据
B) 链路层 GRE IP IPX 载荷数据
C) 链路层 IP GRE IPX 载荷数据
D) 链路层 IPX GRE IP 载荷数据

2. 下列关于 VPNv4 地址的说法正确的是。

A) VPNv4 地址与 IPv4 地址相比多了 RD 前缀
B) VPNv4 地址长度为 96bit
C) VPNv4 地址不会在用户数据报文中出现
D) 在 BGP MPLS VPN 组网中,公网上转发的报文目的地址是 VPNv4 地址

3. 关于 VoIP 电话系统中的回声,下列描述哪些是错误的 ?

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) 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。
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. 在一个 BGP MPLS VPN 组网中,各个 PE 设备下联用户 VPN 的 RT 配置,此时关于各 VPN 用户互访关系说法正确的是。

A) 用户 2 、用户 3 、用户 4 之家不能互相访问
B) 用户 1 只能访问用户 2 、用户 3 、用户 4 中的一个
C) 用户 2 、用户 3 、用户 4 可以通过 PE1 进行互访
D) 用户 1 可以与用户 2 、用户 3 、用户 4 互访

5. 下列关于 GRE 和 BGP MPLS VPN 的说法正确的有。

A) GRE 的私网用户之间只能运行静态路由协议, BGP MPLS VPN 的私网用户之间运行 BGP 动态路由协议
B) 它们都采用可隧道技术实现 VPN
C) GRE 隧道需要静态配置建立, BGP MPLS VPN 的 MPLS 隧道动态建立
D) 它们都是 VPN 技术

Solutions: