Router1 :

The  three routers are shown in the  figure  .A  GRE  tunnel is created between  Routerl  and  Router3  .The configuration commands for the three routers are:

Router1 :

[Routerl]interface Serial 0/2/0

[Routerl-Serial0/2/0]ip address 10.1.1.1 24

[Routerl]interface loopback 0

[Routerl-LoopBack0]ip address l.1.1.1 32

[Routerl]interface Tunnel 0

[Routerl-Tunnel0 ]source 10.1.1.1

[Routerl-Tunnel0]destination 20.1.1.2

[Routerl-Tunnel0]ip address 100.1.1.1 24

[Routerl]ospf

[Routerl-ospf-l]area 0

[Routerl-ospf-l-area-0.0.0.0] network 1 0.1 .1 .1 0.0.0.255

[Routerl]ip route-static 3.3.3.3 32 100.1.1.2

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-l]area 0

[Router2-ospf-l-area-0.0.0.0] network 10.1.1.2 0.0.0.255

[Router2-ospf-l-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]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-l]area 0

[Router3-ospf-l-area-0.0.0.0] network 20.1.1.2 0.0.0.255

[Router3]ip route-static l.1.1.1 32 100.1.1.1

Use the command  ping-a 1.1.1.1 3.3.3.3  on the  Router  to check the connectivity,  l00%  received  icmp  reply packets.

In the process of upward progress, the following describes the processing of data packets by each router.The correct one is  _____  .( Choose one or more )

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