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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____。（选择一项或多项）

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重协商验证方式的命令为____

PPP帧被添加L2TP头进行封装时，会被标以正确的Tunnel ID和Session ID,以标出其隧道和会话属性。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 2.2.2.2 0.0.0.0 [RTA]ipsec policl 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 10.1.1.1 255.255.255.0 [RTA-Ethernet0/1/1] ipsec polic 1 [RTA] interface Ethemet0/1/0。 [RTA-Ethernet0/1/0] ip address 192.168.1.1 255.255.255.0 [RTA] interface Loopback0 [RTA-Loopback0] 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-Tunnel1]ip 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 192.168.2.0 255.255.255.0 100.1.1.2 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 0.0.0.0 destination 1.1.1.1 0.0.0.0 [RTB]ipsec polic 1 1 isakmp [RTB-ipsec-pol ic-isakmp-1 -1 ] securit acl 3000 [RTB-ipsec-polic-isakmp-1 -1 ] ike-peer 123 [RTB-ipsec-polic-isakmp-1 -1 ] proposal 1 [RTB] interface Ethemet0/1/1 [RTB-Ethermet0/1/1] ip address 10.1.1.2 255.255.255.0 [RTB-Ethermet0/1/1] ipsec polic 1 [RTB] interface Ethemet0/1/0 [RTB-Ethermet0/1/0] ip address 192.168.2.1 255.255.255.0 [RTB] interface Loopback0 [RTB-Loopback0] ip address 22.2.2.2 255.255.255.255 [RTB] interface Tunnell [RTB-Tunnel 1]source 2.2.2.2 [RTB-T unnel 1]destination 1.1.1.1 [RTB-Tunnel1]ip address 100.1.1.2 255.255.255.0 [RTB -Tunnel1]keepalive [RTB] ip route-static 1.1.1.1 255.255.255.255 10.1.1.1 [RTB] ip route-static 192.168.1.0 255.255.255.0 100.1.1.1 (缺图)

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 0 255 destination 192 168 2 00.0.0 255 [RTA]ipsec policl 1 1 isakmp [RTA-ipsec-polic-isakmp-1-1] securit ad 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 Ethemet0/1/1 [RTA-Ethernet0/1/1]ip address 10.1.1.1 255.255.255.0 [RTA] interface Ethernet0/1/0 [RTA-Ethernet0/1/0] ip address 192.168.1.1 255.255.255.0 [RTA] interface Loopback [RTA-Loopback0]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-Tunnel1]ip address 100.1.1.1 255.255.255.0 [RTA-Tunnel1]keepalive [RTA-Tunnel1]ipsec polic 1 [RTA] ip route-static 2.2.2.2 255.255.255.255 10.1.1.2 [RTA] ip route-static 192.168.2.0 255.255.255.0 100.1.1.2 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 0.0.0.255 destination 192.168.1.0 0.0.0.255 [RTB]ipsec polic 1 1 isakmp [RTB-ipsec-pol ic-isakmp-1 -1 ] secu rit a cl 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 Ethemet0/1/1 [RTB-Ethermet0/1/1] ip address 10.1.1.2 255.255.255.0 [RTB] interface Ethemet0/1/0 [RTB-Ethermet0/1/0] ip address 192.168.2.1 255.255.255.0 [RTB] interface Loopback0 [RTB-Loopback0] ip address 2.2.2.2 255.255.255.255 [RTB] interface Tunnell [RTB-Tunnel 1]source 2.2.2.2 [RTB-T unnel 1 ]destination 1.1.1.1 [RTB-Tunnel1]ip address 100.1.1.2 255.255.255.0 [RTB-T unnel 1]keepalive [RTA-Tunnel1]ipsec polic 1 [RTB] ip route-static 1.1.1.1 255.255.255.255 10.1.1.1 [RTB] ip route-static 192.168.1.0 255.255.255.0 100.1.1.1 (缺图)

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____

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？

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-acl-adv-3000] rule0 permit ip source 10.1.1.00.255.255.255 [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-Serial0/2/1] ip address 10.1.1.2 255.255.255.0 [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 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 10.3.1.0 0.255.255.255 [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 [RTA]interface Ethernet 0/1/0 [RTA-Serial0/2/1] ipaddress 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____ (缺图)

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 10.1.1.2 255.255.255.0 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 .0.0.255 [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 Serial/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______。

要清除已经建立的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？