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在GRE Tunnel接口视图下，配置隧道封装模式为GRE的完整命令为____。

在L2TP组网中，LNS对用户的验证方式有三种：代理验证、强制CHAP认证和LCP重协商，优先：最高的是____。

通过____命令可以显示L2TP隧道信息。

通过____命令可以显示L2TP会话信息。

PC作为客户机，采用客户LAC模式通过iNode与LNS建立L2TP隧道，提示获取IP超时，则出现此问题可能的原因为____。

在L2TP VPN中，LAC（L2TP Access Concentrator，L2TP访问集中器）接收到从远程系统向服务器方发送的IP数据包，需要对数据包进行相应的封装后发送给LNS（L2TP Network Server，L2TP网络服务器），LAC和LNS间传送的数据包的封装格式为____

在L2TP组网中，配置强制LNS与客户端之间重新进行CHAP验证的命令为____。

在L2TP组网中，配置LNS对用户进行强制LCP重协商蛙证方式的命令为____

PPP帧被添加L2TP头进行封装时，会被标以正确的Tunnel ID和Session ID，以标诅其隧道和会话属性。该L2TP头中的Tunnel ID（隧道标识符）由____________分配，Session ID（会话标识符）由____________分配。

PC采用iNode VPN客户端与网络设备建立L2TP隧道和会话的方式，属于L2TP的____拓扑结构

ZLB（Zero-Length Bod）消息是一个只有L2TP头的控制消息，其作用是作为一个明确应答，以确保控制消息的可靠传递。以下四种情况中，LNS不发送ZLB消息给LAC作为应答的有____。

根据如图组网和下列配置可以、判断这是一个____术的应用。 RTA: [RTA]ike peer 123 [RTA-ike-peer-123]pre-shared-ke simple 123 [RTA-ike-peer-123]remote-address 10.1.1.2 [RTA-ike-peer-123]local-address 10.1.1.1 [RTA-ike-peer-123]quit [RTA]ipsec proposal 1 [RTA-ipsec-proposal-1]quit [RTA]acl number 3000 [RTA-acl-adv-3000]rule 0 permit ip source 1.1.1.10.0.0.0 destination 2.2.2.20.0.0.0 [RTA]ipsec polic 1 1 isakmp [RTA-ipsec-polic-isakmp-1-1]securit acl 3000 [RTA-ipsec-polic-isakmp-1-1]ike-peer 123 [RTA-ipsec-polic-isakmp-1-1]proposal 1 [RTA-ipsec-polic-isakmp-1-1]quit [RTA]interface Ethernet0/1/1 [RTA-Ethernet0/1/1]ip address 10.1.1.1255.255.255.0 [RTA]interface Ethernet0/1/0 [RTA-Ethernet0/1/0]ip address 192.168.1.1255.255.255.0 [RTA]interface Loopback0 [RTA-Loopback0]address 1.1.1.1255.255.255.255 [RTA]interface Tunnel1 [RTA-Tunnel1]source 1.1.1.1 [RTA-Tunnel1]destination 2.2.2.2 [RTA-Tunnel1]ip address 100.1.1.1255.255.255.0 [RTA]ip route-static 2.2.2.2255.255.255.25510.1.1.2 [RTA]ip route-static 192.168.2.0255.255.255.0100.1.1.2 RTB: [RTB]ike peer 123 [RTB-ike-peer-123]pre-shared-ke simple 123 [RTB-ike-peer-123]remote-address 10.1.1.1 [RTB-ike-peer-123]local-address 10.1.1.2 [RTB-ike-peer-123]quit [RTB]ipsec proposal 1 [RTB-ipsec-proposal-1]quit [RTB]acl number 3000 [RTB-acl-adv-3000]rule 0 permit ip source 22.2.2.0.0.0.0 destination 1.1.1.10.0.0.0 [RTB]ipsec polic 1 1 isakmp [RTB-ipsec-polic-isakmp-1-1]securit acl 3000 [RTB-ipsec-polic-isakmp-1-1]ike-peer 123 [RTB-ipsec-polic-isakmp-1-1]proposal 1 [RTB-ipsec-polic-isakmp-1-1]quit [RTB]interface Ethernet0/1/1 [RTB-Ethernet0/1/1]ip address 10.1.1.2255.255.255.0 [RTB]interface Ethernet0/1/0 [RTB-Ethernet0/1/0]ip address 192.168.2.1255.255.255.0 [RTB]interface Loopback0 [RTB-Loopback0]ip address 2.2.2.2255.255.255.255 [RTB]interface Tunnel1 [RTB-Tunnel1]source 2.2.2.2 [RTB-Tunnel1]destination 1.1.1.1 [RTB-Tunnel1]ip address 100.1.1.2255.255.255.0 [RTB]ip route-static 1.1.1.1255.255.255.25510.1.1.1 [RTB]ip route-static 192.168.1.0255.255.255.0100.1.1.1

根据如图组网和下列配置可以判断这是一个________技术的应用。 RTA: [RTA]ike peer 123 [RTA-ike-peer-123]pre-shared-ke simple 123 [RTA-ike-peer-123]remote-address 100.1.1.2 [RTA-ike-peer-123]local-address 100.1.1.1 [RTA-ike-peer-123]quit [RTA]ipsec proposal 1 [RTA-ipsec-proposal-1]quit [RTA]acl number 3000 [RTA-acl-adv-3000]rule 0 permit ip source 192.168.1.0.0.0.0 destination 192.168.2.0.0.0.255 [RTA]ipsec polic 1 1 isakmp [RTA-ipsec-polic-isakmp-1-1]securit acl 3000 [RTA-ipsec-polic-isakmp-1-1]ike-peer 123 [RTA-ipsec-polic-isakmp-1-1]proposal 1 [RTA-ipsec-polic-isakmp-1-1]quit [RTA]interface Ethernet0/1/1 [RTA-Ethernet0/1/1]ip address 10.1.1.1255.255.255.0 [RTA]interface Ethernet0/1/0 [RTA-Ethernet0/1/0]ip address 192.168.1.1255.255.255.0 [RTA]interface Loopback [RTA-Loopback]ip address 1.1.1.1255.255.255.255 [RTA]interface Tunnel1 [RTA-Tunnel1]source 1.1.1.1 [RTA-Tunnel1]destination 2.2.2.2 [RTA-Tunnel1]ip address 100.1.1.1255.255.255.0 [RTA]ip route-static 2.2.2.2255.255.255.25510.1.1.2 [RTA]ip route-static 192.168.2.0255.255.255.0100.1.1.2 RTB: [RTB]ike peer 123 [RTB-ike-peer-123]pre-shared-ke simple 123 [RTB-ike-peer-123]remote-address 100.1.1.1 [RTB-ike-peer-123]local-address 100.1.1.2 [RTB-ike-peer-123]quit [RTB]ipsec proposal 1 [RTB-ipsec-proposal-1]quit [RTB]acl number 3000 [RTB-acl-adv-3000]rule 0 permit ip source 192.168.2.0.0.0.255 destination 192.168.1.0.0.0.255 [RTB]ipsec polic 1 1 isakmp [RTB-ipsec-polic-isakmp-1-1]securit acl 3000 [RTB-ipsec-polic-isakmp-1-1]ike-peer 123 [RTB-ipsec-polic-isakmp-1-1]proposal 1 [RTB-ipsec-polic-isakmp-1-1]quit [RTB]interface Ethernet0/1/1 [RTB-Ethernet0/1/1]ip address 10.1.1.2255.255.255.0 [RTB]interface Ethernet0/1/0 [RTB-Ethernet0/1/0]ip address 192.168.2.1255.255.255.0 [RTB]interface Loopback0 [RTB-Loopback0]ip address 2.2.2.2255.255.255.255 [RTB]interface Tunnel1 [RTB-Tunnel1]source 2.2.2.2 [RTB-Tunnel1]destination 1.1.1.1 [RTB-Tunnel1]ip address 100.1.1.2255.255.255.0 [RTB]ip route-static 1.1.1.1255.255.255.25510.1.1.1 [RTB]ip route-static 192.168.1.0255.255.255.0100.1.1.1

两台路由器间配置IPSec polic，将策略下发到相应接口上后，使用ping命令检查被保护数据流互通性，发现数据100%通过。使用displa ike sa和displa ipsec sa命令，显示为IPSec SA未建立。则IPSec配置失败原因在于____。

用IKE为IPSec提供自动协商交换密钥，建立SA的服务时，在IKE协商的第二阶段定义了哪种IKE交换模式？

和IKE主模式相比，IKE野蛮模式具备以下哪些特点？

如图所示，两台安全网关的配置分别为： RTA: [RTA]ike peer 123 [RTA-ike-peer-123]pre-shared-ke simple 123 [RTA-ike-peer-123]remote-address 10.2.1.2 [RTA-ike-peer-123]local-address 10.2.1.1 [RTA-ike-peer-123]quit [RTA]ipsec proposal 1. [RTA-ipsec-proposal-1]quit [RTA]acl number 3000 [RTA]rule 0 permit ip source 10.1.1.0 255.255.255.255 destination 10.2.1.0 255.255.255.255 [RTA]ipsec polic 1 1 isakmp [RTA-ipsec-polic-isakmp-1-1]securit acl 3000 [RTA-ipsec-polic-isakmp-1-1]ike-peer 123 [RTA-ipsec-polic-isakmp-1-1]proposal 1 [RTA-ipsec-polic-isakmp-1-1]quit [RTA]interface Ethernet 0/1/0 [RTA]interface Serial0/2/1] ip address 10.1.1.2 255.255.255.0 [RTA]interface Serial0/2/1] ip address 10.2.1.2 255.255.255.0 [RTA]Serial0/2/1] ipsec polic 1 RTB: [RTB]ike peer 123 [RTB-ike-peer-123]pre-shared-ke simple 123 [RTB-ike-peer-123]remote-address 10.2.1.1 [RTB-ike-peer-123]local-address 10.2.1.2 [RTB-ike-peer-123]quit [RTB]ipsec proposal 1 [RTB-ipsec-proposal-1]quit [RTB]acl number 3000 [RTB]rule 0 permit ip source 10.3.1.0 255.255.255.255 destination 10.2.1.0 255.255.255.255 [RTB]ipsec polic 1 1 isakmp [RTB-ipsec-polic-isakmp-1-1]securit acl 3000 [RTB-ipsec-polic-isakmp-1-1]ike-peer 123 [RTB-ipsec-polic-isakmp-1-1]proposal 1 [RTB-ipsec-polic-isakmp-1-1]quit [RTB]interface Ethernet 0/1/0 [RTB]interface Serial0/2/1] ip address 10.3.1.1 255.255.255.0 [RTB]interface Serial0/2/1] ip address 10.2.1.2 255.255.255.0 [RTB]Serial0/2/1] ipsec polic 1 由此可知____。

如图所示，两台安全网关的配置分别为： RTA: [RTA]ike peer 123 [RTA-ike-peer-123]pre-shared-ke simple 123 [RTA-ike-peer-123]remote-address 10.2.1.2 [RTA-ike-peer-123]local-address 10.2.1.1 [RTA-ike-peer-123]quit [RTA]ipsec proposal 1 [RTA-ipsec-proposal-1]quit [RTA]acl number 3000 [RTA]rule 0 permit ip source 10.1.1.0 0.0.0.255 destination 10.3.1.0 0.0.0.255 [RTA]ipsec polic 1 1 isakmp [RTA-ipsec-polic-isakmp-1-1]securit acl 3000 [RTA-ipsec-polic-isakmp-1-1]ike-peer 123 [RTA-ipsec-polic-isakmp-1-1]proposal 1 [RTA-ipsec-polic-isakmp-1-1]quit [RTA]interface Serial0/2/1] ip address 10.2.1.1 255.255.255.0 [RTA]ipsec polic 1 [RTA]interface Ethernet 0/1/0 [RTA]Serial0/2/1] ip address 10.1.1.2 255.255.255.0 RTB: [RTB]ike peer 123 [RTB-ike-peer-123]pre-shared-ke simple 123 [RTB-ike-peer-123]remote-address 10.2.1.1 [RTB-ike-peer-123]local-address 10.2.1.2 [RTB-ike-peer-123]quit [RTB]ipsec proposal 1 [RTB-ipsec-proposal-1]quit [RTB]acl number 3000 [RTB]rule 0 permit ip source 10.3.1.0 0.0.0.255 destination 10.2.1.0 0.0.0.255 [RTB]ipsec polic 1 1 isakmp [RTB-ipsec-polic-isakmp-1-1]securit acl 3000 [RTB-ipsec-polic-isakmp-1-1]ike-peer 123 [RTB-ipsec-polic-isakmp-1-1]proposal 1 [RTB-ipsec-polic-isakmp-1-1]quit [RTB]interface Ethernet 0/1/0 [RTB]interface Serial0/2/1] ip address 10.3.1.1 255.255.255.0 [RTB]interface Serial0/2/1] ip address 10.2.1.2 255.255.255.0 [RTB]Serial0/2/1] ipsec polic 1 由此可知____。

如图所示，两台安全网关的配置分别为：RTA： [RTA]ike peer 123 [RTA-ike-peer-123]pre-shared-ke simple 123 [RTA-ike-peer-123]remote-address 10.2.1.2 [RTA-ike-peer-123]local-address 10.2.1.1 [RTA-ike-peer-123]quit [RTA]ipsec proposal 1 [RTA-ipsec-proposal-1]quit [RTA]acl number 3000 [RTA-acl-adv-3000]rule 0 permit ip source 10.1.1.0 0.0.0.255 destination 10.3.1.0 0.0.0.255 [RTA]ipsec polic 1 1 isakmp [RTA-ipsec-polic-isakmp-1-1]securit acl 3000 [RTA-ipsec-polic-isakmp-1-1]ike-peer 123 [RTA-ipsec-polic-isakmp-1-1]proposal 1 [RTA-ipsec-polic-isakmp-1-1]quit [RTA]interface Serial0/2/1 [RTA-Serial0/2/1]ip address 10.2.1.1 255.255.255.0 [RTA-Serial0/2/1]ipsec polic 1 [RTA]interface Ethernet 0/1/0 [RTA-Serial0/2/1]ip address 10.1.3.1 255.255.255.0 RTB： [RTB]ike peer 123 [RTB-ike-peer-123]pre-shared-ke simple 123 [RTB-ike-peer-123]remote-address 10.2.1.1 [RTB-ike-peer-123]local-address 10.2.1.2 [RTB-ike-peer-123]quit [RTB]ipsec proposal 1 [RTB-ipsec-proposal-1]quit [RTB]acl number 3000 [RTB-acl-adv-3000]rule 0 permit ip source 10.1.1.0 0.0.0.255 destination 10.3.1.0 0.0.0.255 [RTB]ipsec polic 1 1 isakmp [RTB-ipsec-polic-isakmp-1-1]securit acl 3000 [RTB-ipsec-polic-isakmp-1-1]ike-peer 123 [RTB-ipsec-polic-isakmp-1-1]proposal 1 [RTB-ipsec-polic-isakmp-1-1]quit [RTB]interface Serial0/2/1 [RTB-Serial0/2/1]ip address 10.2.1.2 255.255.255.0 [RTB-Serial0/2/1]ipsec polic 1 由此可知_____

要清除已经建立的IPSec安全联盟，应该使用以下哪个命令？