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H3CSE-RS-NSO Sample Questions:

1. 主叫 UA 发送一条请求消息并收到了被叫 UA 的 2000K 响应,此主叫 UA 如何撤销刚才的请求 ?

A) 立即向被叫 UA 发送 Cancel 消息
B) 立即向被叫 UA 发送 Back 消息
C) 立即向被叫 UA 发送 BE 消息
D) 无法撤销刚才的请求

2. 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,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
B) 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
C) 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
D) 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

3. 对于畸形报文防御说法正确的有。

A) 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
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) 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
D) 畸形报文攻击需要对每一种攻击进行针对性防御

4. 按照网络层次的不同, VPN 可以分为以下哪几种类型

A) Layer3 VPN
B) Layer2 VPN
C) Intranet VPN
D) Internet VPN

5. 在独立 LAC 模式的 L2TP 基本配置中,有关隧道本端的名称的描述正确的是

A) 默认情况下,隧道本端的名称为空
B) 在 L2TP 组视图下,使用 Tunnel name name 命令配置本端隧道名称
C) 在系统视图下,使用 Tunnel-name name 命令配置本端隧道名称
D) 默认情况下,隧道本端的名称为系统的名称

Solutions: