Answer :
Final answer:
The output of the show crypto ipsec sa command shows the active IPsec security associations (SAs) established between two endpoints, providing information about their status, local and remote IP addresses, encryption and authentication algorithms, and lifetimes. In this context, if the output shows that IPSec Phase 2 is established between the specified IP addresses, it means the IPsec tunnel is up and functional.
Explanation:
The show crypto ipsec sa command is used to display information about the IPsec security associations (SAs) established on a router or firewall. The output of this command shows the active IPsec SAs, including information such as the local and remote IP addresses, the encryption and authentication algorithms being used, the lifetimes of the SAs, and the status of the SAs (whether they are established or down).
In the given context, if the output of the show crypto ipsec sa command shows that the IPSec Phase 2 is established between 10.1.1.1 and 10.1.1.5, it means that the IPsec tunnel between the two endpoints is up and functional. This indicates that the encrypted communication between the two sites is working as expected.
Therefore, the correct answer is C. IPSec Phase 2 is established between 10.1.1.1 and 10.1.1.5.
