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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，优先级最高的是

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 LNS 对用户进行强制LCP 重协商验证方式的命令为

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

PPP 帧被添加 L2TP 头进行封装时，会被标以正确的Tunnel ID和Session ID，以标识其隧道和会话属性。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 10.1.1.2 [RTA-ike-peer-123]local-address 10.1.1.1 [RTA-ike-peer-123]quit [RTAJipsec proposal I [RTA-ipsec-proposal-I]quit [RTA]acl number 3000 [RTA-acl-adv-3000]rule O permit ip source 1.1.1.10.0.0.0 destination 2.2.2.2 0.0.0.0 [RTAJipsec polic 11 isakmp [RTA-ipsec-polic-isakmp-l-I]securit acl 3000 [RTA-ipsec-polic-isakmp-1-1]ike-peer 123 [RTA-ipsec-polic-isakmp-I-I]proposal[RTAipsec-polic- isakmp-l-l]quit [RTA Ethernet0/1/1] ip address 10.1.1.1255.255.255.0 [RTA Ethernet0/1/1jipsec polic I [RTAJinterface Ethernet0/1/0 [RTA Ethernet0/1/0] ip address 192.168.1.1255.255.255.0 [RTA]interface loopback 0 [RTA- LoopbackOjip address 1.1.1.1 255.255.255.255 [RTA]interface Tunnel 1 [RTA-Tunnel1]source 1.1.1.1 [RTA-Tunnel1]destination 2.2.2.2 [RTA-Tunnelljip address 100.1.1.1 255.255.255.0 [RTA] ip route-static 2.2.2.2 255.255.255.255 10.1.1.2 [RTA] ip route-static 192.168.2.0 255.255.255.0100.1.1.2 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-I] quit [RTB]acl number 3000 [RTB-acl-adv-3000] rule o permit ip source 2.2.2.20.0.0.0 destination I.1.1.1 0.0.0.0 [RTB]ipsec polic 1 1 isakmp [RTB-ipsec-polic-isakmp-l-I] securit acl 3000 [RTB-ipsec-polic-isakmp-1-1] ike-peer 123 [RTB-ipsec-polic-isakmp-1-I] proposal 1 [RTB] interface Ethernet0/1/1 [RTB-Ethernet0/1/1]ip address 10.1.1.2255.255.255.0 [RTB-Ethernet0/1/1]ipsec polic 1 [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 2.2.2.2 255.255.255.255 [RTB]interface Tunnell [RTB-Tunnell]source 2.2.2.2 [RTB-Tunnell]destination I.1.1.1 [RTB-Tunnelljip address 100，1.1.2 255.255.255.0 [RTB-Tunnell]keepalive [RTB]ip route-static 1.1.1.1 255.255.255.255 10.1.1.1 [RTB]ip route-static 1 92.1 68.1.0 255.255.255.0 100.1.1.1

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 ＜i IRTA-ike-peer-123]local-address 100.1.1.1 [RTA-ike-peer-123]quit[RTA]ipsec proposal 1 IRTA-ipsec-proposal-IJquit [RTA]acl number 3000 [RTA-acl-adv-3000]rule 0 permit ip source 192.168.1.0 0.0.0.255 destination 192.168.2.00.0.0.255 [RTAJipsec polic 1 1 isakmp [RTA-ipsec-polic-isakmp-l-I]securit acl 3000 [RTA-ipsec-polic-isakmp-l-l]ike-peer 123 [RTA-ipscec-polic-isakmp-1-1]proposal 1 [RTA-ipsec-polic-isakmp-I-I]quit [RTA]interface EthernetO/1/1 [RTA-Ethernet0/1/1]ip address 10.1.1.1255.255.255.0 [RTA]interface EthernetO/1/O [RTA-Ethernet0/1/0]ip address 192.168.1.1255.255.255.0 [RTA]interface Loopback0 [RTA-LoopbackO]ip address 1.1.1.1 255.255.255.255 [RTA]interface Tunnel 1 [RTA-Tunnel1]source 1.1.1.1 [RTA-Tunnel1]destination 2.2.2.2 [RTA-Tunnelljip address 100.1.1.1 255.255.255.0 [RTA-Tunnel 1]keepalive [RTA-Tunnell]ipsec polic 1 [RTA] ip route-static 2.2.2.2 255.255.255.255 10.1.1.2 [RTA] ip route-static 192.168.2.0 255.255.255.0 RIB. [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-I] quit [RTB]acl number 3000 [RTB-acl-adv-3000] rule o permit ip source 192.168.2.0 0.0.0.255 destination 192.168.1.00.0.0.255 [RTBJipsec polic 1 1 isakmp [RTB-ipsec-polic-isakmp-l-I] securit acl 3000 [RTB-ipsec-polic-isakmp-1-I] ike-peer 123 [RTB-ipsec-polic-isakmp-1-1] proposal 1 [RTB-ipsec-polic-isakmp-l-I] quit [RTB] interface Ethernet0/1/1 [RTB-Ethernet0/1/1] ip address 10.1.1.2255 255 255ი [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 2.2.2.2 255.255.255.255 [RTB] interface Tunnell [RTB-Tunnell]source 2.2.2.2 [RTB-Tunnell]destination I.1.1.1 [RTB-Tunnelljip address 100.1.1.2 255.255.255.0 [RTB-Tunnell]keepalive [RTA-Tunnelljipsec polic 1 [RTB] ip route-static I.1.1.1 255.255.255.255 10.1.1.1 [RTB] ip route-static 1 92.1 68.1.0 255.255.255.0 100.1.1.1

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俞令，显示为IPSec SA未建立。则IPSec配置失败原因在于

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

下列关于IPSec 与IKE 的说法正确的是

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？

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 0.255.255.255 [RTAJipsec 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-Serial0/2/1] ip address 10.2.1.1 255.255.255.0 [RTA] interface Serial 0/2/1 [RTA-Serial0/2/1] ip address 10.2.1.1 255.255.255.0 [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-acl-adv-3000] rule 0 permit ip source 10.3.1.00.255.255.255 [RTB]ipsec polic 11 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 [RTA] interface Ethernet 0/1/0 [RTA-Serial0/2/1] ip address 10.3.1.1 255.255.255.0 [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

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 [RTAJacl 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 [RTAJipsec 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 10.1.1.2 255.255.255.0 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-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 [RTBJipsec 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 [RTA]interface Ethernet 0/1/0 [RTA-Serial0/2/1]ip address 10.1.3.1 255.255.255.0 由此可知

要清除已建立的IPSec安全联盟，应该使用以下哪个命令？

要清除 ike建立的安全隧道，应该使用以下哪个命令？

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