Which of the following commands are optional for GRE configuration? (Choose two.)
- tunnel source {ip-address | interface-id}
- tunnel destination ip-address
- tunnel mode gre {ip | ipv6}
- keepalive
Explanation: When configuring a tunnel interface, the default mode is GRE, so there is no need to specify the tunnel mode with the command tunnel mode gre {ip | ipv6}. The command is useful when the tunnel mode is changed to another type (such as IPsec) and there is a need to change the tunnel mode back to GRE.
The keepalive command is also optional. It is used to make sure the other end of the tunnel is operational. This command does not need to be configured on both ends of the tunnel in order to work.
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