Which command should be used in the advanced shell to display the route table?

The command that accurately displays the route table in the advanced shell of Sophos XG Firewall is "ip route show." This command is part of the "ip" suite used in Linux environments, which is effective for querying network properties.

Using "ip route show" allows users to view the routing table that consists of all the routes the system uses to determine the best path for network traffic. This output includes various details such as the destination addresses, gateway addresses, and interface associations, which are crucial for troubleshooting network connectivity or configuring routing policies.

The other options do not specifically provide the routing table information as effectively as this command. For instance, while "ip rule show" displays policy routing rules, it does not present the actual routing table. Meanwhile, "route table display" is not a valid command in this context, and "ip show table" does not provide useful information regarding the routing directly.

Thus, using "ip route show" is the most appropriate command for displaying the routing table in this scenario.