Explanation:

Display the time and process information of the device, as well as CPU, memory, and disk usage data. = show sdwan system status1 Validate the configured zone-based firewall. = show policy-firewall config1 Display information about application-aware routing policy matched packet counts on the Cisco IOS XE SD-WAN devices. = show sdwan policy app-route-policy-filter1 View the security information that is configured for IPsec tunnel connections. = show sdwan security-info The commands used to identify issues on a Cisco IOS XE SD-WAN device are as follows1:
show sdwan system status: This command is used to display the time and process information of the device, as well as CPU, memory, and disk usage data1.
show policy-firewall config: This command is used to validate the configured zone-based firewall1.
show sdwan policy app-route-policy-filter: This command is used to display information about application-aware routing policy matched packet counts on the Cisco IOS XE SD-WAN devices1.
show sdwan security-info: This command is used to view the security information that is configured for IPsec tunnel connections1.
References :=
Cisco IOS XE Catalyst SD-WAN Qualified Command Reference
Cisco Catalyst SD-WAN Command Reference
Cisco Catalyst SD-WAN Systems and Interfaces Configuration Guide, Cisco IOS XE SD-WAN Tunnel Interface Commands - Cisco