Option A is correct because the OSPF interface network types determine how the routers form adjacencies and exchange LSAs on a network segment. The network types must match for the routers to become neighbors1.
Option B is correct because the OSPF router IDs are used to identify each router in the OSPF domain and to establish adjacencies. The router IDs must be unique for the routers to become neighbors2.
Option E is correct because the authentication settings control how the routers authenticate each other before exchanging OSPF packets. The authentication settings must match for the routers to become neighbors3.
Option C is incorrect because the OSPF interface priority settings are used to elect the designated router (DR) and the backup designated router (BDR) on a broadcast or non-broadcast multi-access network. The priority settings do not have to be unique for the routers to become neighbors, but they affect the DR/BDR election process4.
Option D is incorrect because the OSPF link costs are used to calculate the shortest path to a destination network based on the bandwidth of the links. The link costs do not have to match for the routers to become neighbors, but they affect the routing decisions5. Reference: =
1: OSPF network types
2: OSPF router ID
3: OSPF authentication
4: OSPF interface priority
5: OSPF link cost

* Option B is correct because the routing table shows that the tunnel interfaces have a netmask of
255.255.255.255, which indicates that net-device is enabled in the phase 1 configuration. This option allows the FortiGate to use the tunnel interface as a next-hop for routing, without adding a route to the phase 2 destination1.
* Option D is correct because the routing table does not show any routes to the phase 2 destination networks, which indicates that add-route is disabled in the phase 1 configuration. This option controls whether the FortiGate adds a static route to the phase 2 destination network using the tunnel interface as the gateway2.
* Option A is incorrect because IPSec tunnel aggregation is a feature that allows multiple phase 2 selectors to share a single phase 1 tunnel, reducing the number of tunnels and improving performance3.
This feature is not related to the routing table or the phase 1 configuration.
* Option C is incorrect because OSPF is a dynamic routing protocol that can run over IPSec tunnels, but it requires additional configuration on the FortiGate and the peer device4. This option is not related to the routing table or the phase 1 configuration. References: =
* 1: Technical Tip: 'set net-device' new route-based IPsec logic2
* 2: Adding a static route5
* 3: IPSec VPN concepts6
* 4: Dynamic routing over IPsec VPN7

From the command output shown in the exhibit:
B: The IKE version is 2: This can be deduced from the presence of 'ver=2' in the output, which indicates that IKEv2 is being used.
C: Both IPsec SAs are loaded on the kernel: This is indicated by the line 'npu flags=0x0/0', suggesting that no offload to NPU is occurring, and hence, both Security Associations are loaded onto the kernel for processing.
Fortinet documentation specifies that the version of IKE (Internet Key Exchange) used and the loading of IPsec Security Associations can be verified through the diagnostic commands related to VPN tunnels.

For an ADVPN spoke configuration shown, the corresponding hub must have auto-discovery-sender enabled to send shortcut advertisement messages to the spokes. Also, the hub would need to have auto-discovery- forwarder enabled if it is to forward on those shortcut advertisements to other spokes. This allows the hub to inform all spokes about the best path to reach each other. The ike-version does not need to be reconfigured on the hub if it's already set to version 2 and auto-discovery-receiver is not necessary on the hub because it's the one sending the advertisements, not receiving.
References:
* FortiOS Handbook - ADVPN

In the event of an outage at 10.0.1.240, the FortiGate will choose the next server in the sequence for web filter rating requests, which is 10.0.1.244 according to the configuration shown in the exhibit. This is because the server list is ordered by priority, and the server with the lowest priority number is chosen first. If that server is unavailable, the next server with the next lowest priority number is chosen, and so on. The public FortiGuard servers are only used if the include-default-servers option is enabled and all the custom servers are unavailable. References := Fortinet Enterprise Firewall Study Guide for FortiOS 7.2, page 132.