kubectl get nodes
NAME                                 STATUS   ...     AGE    VERSION
gke-xxx-default-pool-83e239a7-kcg8   Ready    ...     42m    v1.9.7-gke.6
gke-xxx-default-pool-83e239a7-qm6b   Ready    ...     42m    v1.9.7-gke.6
gke-xxx-default-pool-83e239a7-wnrq   Ready    ...     42m    1.9.7-gke.6
gcloud compute routes list
NAME                 NETWORK        DEST_RANGE         NEXT_HOP
...
[ROUTE_NAME]         default        10.24.0.0/24       [YOUR_NODE_NAME]
...
In the output, you can see that the route provides a next hop for any packet that is destined for a particular Pod address range.