In a hub‑and‑spoke design, the hub contains a HA virtual appliance fronted by an internal load balancer at 10.0.0.5. All spokes must be peered with the hub and use the hub appliance for internet access. Which sequence of routing and route export/import actions enforces this?

This solution correctly establishes the hub-and-spoke routing. Step 1 directs all hub traffic to the internal load balancer (ILB) fronting the HA appliance. Step 2 ensures the appliance itself can reach the internet, using a higher-priority, tagged route to avoid a routing loop with the ILB. Step 3 exports the custom default route from the hub to the spokes, making the hub appliance the internet gateway for spokes. Finally, Step 4 removes the default internet gateway route in the spokes, forcing all spoke internet-bound traffic through the peered hub and its appliance. Option 1 is incorrect because it misses the crucial step of deleting the default internet gateway route in the spokes, which would prevent spoke traffic from using the hub appliance for internet access. Option 3 is incorrect because creating two default routes to individual appliance instances bypasses the ILB, losing the HA benefit. Option 4 is incorrect because manually creating a route in each spoke pointing to the hub appliance is not scalable and doesn't leverage custom route export/import, which is essential for a hub-and-spoke design.