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

1. 关于证书 OCSP 和 CRL 技术说法正确的是 ?

A) OCSP 协议以在线的方式获取某个证书的吊销状态,以此来检查对方的证书是否被吊销。
B) 从客户端证书中自动获取的 CDP （ CPL Distribution Points )信息不会存储到配置文件,所以当 USG 重启后,自动获取的 CDP 信息将不被保存。
C) CRL 比 OCSP 具有更高的时效性。
D) OCSP 可以实时获取证书的吊销状态。
E) OCSP 必须经常在客户端下载证书列表,以保证列表更新。

2. 某企业网络中存在多个真实服务器对外提供 FTP 服务,配置负载均衡功能,保证流经 USG 的流量负载均衡。
管理员希望通过检测真实服务器状态,实现每台服务器的负载比例与权值比例相同,下列合适的配置是:

A) # 配置真实服务器加入负致均衡组。 [USG-slb] group test [USG-slb-group-test] metric srchash [USG-slb-group-test] addrserver 1 [USG-slb-group-test] addrserver 2 [USG-slb-group-test] addrserver 3 [USG-slb-group-test] quit
B) # 配置真实服务器加入负致均衡组。 [USG-slb] group test [USG-slb-group-test] metric least-connection [USG-slb-group-test] addrserver 1 [USG-slb-group-test] addrserver 2 [USG-slb-group-test] addrserver 3 [USG-slb-group-test] quit
C) # 配置真实服务器加入负致均衡组。 [USG-slb] group test [USG-slb-group-test] metric weightrr [USG-slb-group-test] addrserver 1 [USG-slb-group-test] addrserver 2 [USG-slb-group-test] addrserver 3 [USG-slb-group-test] quit
D) # 配置真实服务器加入负致均衡组。 [USG-slb] group test [USG-slb-group-test] metric roundrobin [USG-slb-group-test] addrserver 1 [USG-slb-group-test] addrserver 2 [USG-slb-group-test] addrserver 3 [USG-slb-group-test] quit

3. 华为 USG 防火墙,在双机热备组网下（如图), PC 通过 SSH 无法登陆备防火墙 FW2 的外网口实 IP 地址,查看主备防火墙上对应的会话如下,分析下对于这个故障下列哪些说法是对的 ?
HRP_A <E1000-1> display firewall session table verbose source inside 192.168.22.151
tcp VPN: public ->
public
Zone: trust -> local TTL: 00:00:05 Left: timeout
Interface: G0/0/1 Nexthop: 192.168.22.122 MAC: 00-22-a1-06-b3-cb
<-- packets: 1
bytes: 48 -> packets: 0 bytes: 0
192.168.22.122:22 <-- 192.168.22.151:4354
HRP_S <-E1000-2>display firewall session table verbose source inside 192.168.22.151
tcp VPN: public -> public
Zone: trust -> local TTL: 00:00:05 Left: timeout
Interface: I0 Nexthop: 127.0.0.1 MAC: 00-00-00-00-00-00
<-- packets: 1
bytes: 48 -> packets: 1 bytes: 44
192.168.22.122:22 <-- 192.168.22.151:4354

A) 由于 SSH 客户端在登陆过程中支持报文重传。
B) PC 登陆备防火墙 FW2 的时候存在来回路径不一致。
C) 由于关闭铬路状态检测功能 indo firewall session link-state check 导致的问题。
D) 由于关闭了 hrp mirror session enable 可能导致该问题。

4. 采用如下哪种 Ipsec 模式和封装方式可以引用于 IPSEC NAT 穿越的应用场景 ?

A) IPSEC 传输模式 + AH 封装
B) IPSEC 隧道模式 + AH 封装
C) IPSEC 传输模式 + ESP 封装
D) IPSEC 隧道模式 + ESP 封装

5. 关于 MTU 和 PMTU 说法正确的是 ?

A) 在 IP 网络中,从源地址到目的地址可能会经过具有不同 MTU 值的接口,其中最大的 MTU 值即为该路径的 PMTU 。
B) 探测 PMTU 是通过探测获取指定目的 IPv4 地址的 PMTU 值,然后使用 MTU 值来发送报文。
C) MTU （ Maximum Transfer Unit )指的是在网络中能够传输的最大数据报文的大小,以字节为单位。
D) 设备会在入接口检查 MTU ,如果数据包大小超过 MTU 值,将被丢弃。

Solutions: