20 points) ISP .2 .6 so/o 1.11.0/30 111.4/30 R1 sofO R2 172.1610/30 fo/o foro 192168.20/24 192.168.10/24 In the above topology, R1 and R2 can reach each other via their so/o IP addresses. In the boxes below, write the commands necessary to configure an unencrypted GRE tunnel between R1 and R2 using the 172.16.1.0/30 subnet as indicated in the topology diagram. You do not need to write down the router prompts. You do not need to configure any routing
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