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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，SessionID (会话标识符) 由____分配(单选)

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_(单选)

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 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 source1.1.1.10.0.0.0 destination2.2.2.20.0.0.0 [RTA]ipsec policy 11isakmp [RTA-ipsec-policy-isakmp-1]securit acl 3000 [RTA-ipsec-policy-isakmp-1]ike-peer 123 [RTA-ipsec-policy-isakmp-1-1] proposall [RTA-ipsec-policy-isakmp-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 policy 1 [RTA]interface Ethernet0/1/0 [RTA Ethernet0/1/0] ip address 192.168.1.1.255.255.255.0 [RTA]interface loopback 0 [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]destination2.2.2.2 [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 o permit ip source2.2.2.2 0.0.0.0 destination 1.1.1.10.0.0.0 [RTB]ipsec policy 1 lisakmp [RTB-ipsec-polic-isakmp-1]securit acl 3000 [RTB-ipsec-policy-isakmp-1] ike-peer 123 [RTB-ipsec-policy-isakmp-1-1] proposal 1 [RTB] interface Ethernet0/1/1 [RTB-Ethernet0/1/1] ip address 10.1.1.2.255.255.255.0 [RTB-Ethernet0/1/1]ipsec polic 1 [RTB] interface Ethernet0/1/0 [RTB-Ethernet0/1/0] 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 Tunnel1 [RTB-Tunnel1]source 2.2.2.2 [RTB-Tunnel1]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 1 92.61 68.1.0.255.255.255.0 1 00.1.1.1

[RTB] ip route-static 1 92.68.1.0.255.255.255.0 1 00.1.1.1 (单选)

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__。 ( 单选)

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KE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?

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 source10.1.100.255.255.255 [RTA]ipsec polic 11isakmp [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 source10.3.1.00.255.255.255 [RTB]ipsec polic 1 lisakmp [RTB-ipsec-polic-isakmp-1-1]securit ac 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____。

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 source10.1.1.00.0.0.255 destination10.3.1.0.0.0.0.255 [RTA]ipsec polic 11isakmp [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]ip address 10.1.1.2.255.255.255.0 [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 source10.1.1.0.0.0.255 destination10.3.1.0.0.0.0.255 [RTB]ipsec polic 1 lisakmp [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?

LDP会话建立的过程是____。

下游LSR设备通过Label mapping消息将其为FEC分配的_____发布给上游LSR。

对于一台LSR的标签转发表 ,描述正确的是

对于上下游的两台LSR来讲,针对同一转发等价类的标签转发表,描述正确的是_。

在保守的标签保留方式下,按图示的组网，LSR2可以保留哪一台LSR针对20.0.0.1/24这条路由的标签信息? (单选)

MPLS网络的边缘设备被成为____。(单选)

当标签分发方式为____时,下游设备需要等到上游设备的标签分配申请才可以分配标签。(单选)

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