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Huawei HCIE-Security (Huawei Certified Internetwork Expert-Security) (H12-731中文版) Sample Questions:

1. 在 Agile Controller 的解决方案中, USG 用于硬件 SACG 接入认证。
根据以下信息:
<USG6700> display right-manager role-id rule
Advanced ACL 3099, 5 rules, not binding with vpn-instance
Acl's step is 1
rule 1000 permit ip (1200 times matched)
rule 1001 permit ip destination 172.13.11.2210 (501 times matched)
rule 1002 permit ip destination 172.10.11.223 0 (77 times matched)
rule 1003 permit ip destination 172.19.0.0 0.0.255.255 (0 times matched)
rule 1004 deny ip (507759 times matched)

A) 用户进入认证前域
B) 逃生通道已经被开启
C) 用户进入认证后域
D) 用户进入隔离域

2. 某局点微信语音（ TCP )业务出现延时较大的故障,延时达到 3 秒。防火墙作为其出口 NAT 网关,配置了 easy-ip 的 nat 方式（单出口),关闭了链路状态检测, TCP 老化时间为 30 秒,业务流量较小,到语音服务器的会话数接近 5 万。通过会话可以看到大量的单向访问语音服务器的报文。
造成这一故障的原因及解决方案正确的是 ?

A) TCF 会话老化时间太短,防火墙新建会话比较耗时。
B) 如果链路不存在来回路径不一致,可以开启链路状态检测功能,老化时间默认,可以解决这一问题。
C) 解决方案可以 TCP 老化时间增加到 600 秒。
D) 防火墙会话老化后,新的连接做 NAT 后的端口与原来和服务器建立连接的端口不一致,导致服务器没有响应,需要客户端超时后再重新建立连接才能发送数据。

3. 在 TCP 欺骗攻击中,攻击者为实现与受害主机建立虚假的 TCP 连接,必须通过计算或猜测获取至 TCP 会话中的关键信息是:

A) 受害主机回应的 Acknowledgement Number
B) 受害主机回应的 Chechsum
C) 受害主机回应的 Sequence Number
D) 受害主机回应的 Urgent Pointer

4. 如图所示攻击,相应的防御方法有:

A) 通过关联的 TCP 协议对用户进行验证
B) 指纹学习防御
C) 通过 TTL 检查的方法进行防御
D) 载荷检查防御
E) 通过源认证的方法防御

5. 对于如图所示组网,建立 IPsec 隧道的一端使用两台设备进行双机热备,当发生主备切换时,以下描述正确的是 ?

A) 从 USG_C 往 HQ 方向的报文会触发重新协商,业务不会受影响。
B) 在 USG_A 、 USG_B 、 USG_C 上配置 dpd 机制,能够增加 IPsec 双机热备的可靠性。
C) IPsec 隧道不需要重新协商。
D) Keepalive 机制相对 DPD 机制,消耗更少的 CPU 资源。

Solutions: