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三台路由器如图所示,在Router1和Router3之间创建GRE隧道, 三台路由器配置分别为: Router1 : [Router1]interface Serial 0/2/0 [Router1-Serial0/2/0]ip address 10.1.1.1 24 [Router1]interface loopback 0 [Router1-LoopBack0]ip address 1.1.1.1 32 [Router1]interface Tunnel 0 [Router1-Tunnel0]source 10.1.1.1 [Router1-Tunnel0]destination 20.1.1.2 [Router1-Tunnel0]ip address 100.1.1.1 24 [Router1]ospf [Router1-ospf-1]area 0 [Router1-ospf-1-area-0.0.0.0]network 10.1.1.1 0.0.0.255 [Router1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0 Router2: [Router2]interface Serial 0/2/0 [Router2-Serial0/2/0]ip address 10.1.1.2 24 [Router2]interface Serial 0/2/1 [Router2-Serial0/2/1]ip address 20.1.1.1 24 [Router2]ospf [Router2-ospf-1]area 0 [Router2-ospf-1-area-0.0.0.0] network 10.1.1.2 0.0.0.255 [Router2-ospf-1-area-0.0.0.0] network 20.1.1.1 0.0.0.255 Router3: [Router3]interface Serial 0/2/0 [Router3-Serial0/2/0]ip address 20.1.1.2 24 [Router3-Serial0/2/0]quit [Router3]interface loopback 0 [Router3-Loop Back0]ip address 3.3.3.3 32 [Router3]interface Tunnel 0 [Router3-Tunnel0]source 20.1.1.2 [Router3-Tunnel0]destination 10.1.1.1 [Router3-Tunnel0]ip address 100.1.1.2 [Router3]ospf [Router3-ospf-1]area 0 [Router3-ospf-1-area-0.0.0.0]network 20.1.1.2 0.0.0.255 [Router3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0 在Router上使用命令ping -a 1.1.1.1 3.3.3.3,检查连通性,l00%收到icmp回包。上进过 程中,以下对各路由器对数据包的处理过程酌描述,正确的是_____。(多项选择题)