Routerl:

The  three routers are shown in the  figure  .A  GRE  tunnel is created between  Routerl  and  RouLer3  .The configuration commands for the three routers are  :

Routerl:

[Router1]interface Serial 0/2/0

[Router1-Serial0/2/0]ip address 10.1.1.1 24

ERouter1]interface loopback 0

[Router1-LoopBack0]ip addre ss 1.1.1.1 32

[Router1]interface Tunnel 0

[Router1-Tunnel0]source 10.1.1.1

[Router1-Tunnel0]destination 20.1.1.2

[Routerl-Tunnel0]ip address 100.1.1.1 24

[Router1]ospf

IRouter1-ospf-1]area 0

IRouter1-ospf-1-area-0.0.0.0]network 10.1.1.1 0.0.0.255

[Router1]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-Serial0/2/0]ip address 20.1.1.1 24

[Router2]ospf

IRouter1-ospf-1]area 0

IRouter1-ospf-1-area-0.0.0.0]network 10.1.1.2 0.0.0.255

IRouter1-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]interface loopback 0

[Router3-LoopBack0]ip address 3.3.3.3 32

[Router3]interface Tunnel 0

[Router3-Tunnel0]source 20.1.1.2

[Router3-Tunnel0]destination 1 0.1.1.1

[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  Router 1  to check the connectivity, and  100%  receive  ICMP  reply packets.

In the above process, the following description of the various routers to process packets of data, is correct  ____  .( Choose one or more )

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