Two sites, each with one WAN Edge and two public TLOCs; TLOCs are fully reachable and no restrict is configured. How many data-plane tunnels does each WAN Edge form?

Each WAN Edge router forms data plane tunnels (IPsec or GRE) with the TLOCs of other WAN Edge routers. In this scenario, there are two sites, and each site has one WAN Edge router. Therefore, there are a total of two WAN Edge routers. Each WAN Edge router has two public TLOCs. A WAN Edge router will establish tunnels to all TLOCs of all other WAN Edge routers in the overlay network. So, for WAN Edge A, it needs to form tunnels to the TLOCs of WAN Edge B. Since WAN Edge B has two TLOCs, WAN Edge A will form two tunnels to WAN Edge B. Similarly, WAN Edge B will form two tunnels to WAN Edge A. The question asks how many data-plane tunnels each WAN Edge forms. Each WAN Edge forms tunnels to the two TLOCs of the other WAN Edge. Therefore, each WAN Edge forms 2 tunnels 1 other WAN Edge = 2 tunnels. Wait, let's re-evaluate. The question states "TLOCs are fully reachable and no restrict is configured." This implies that each TLOC on a given WAN Edge will attempt to form a tunnel to every TLOC on every other WAN Edge. Let's say WAN Edge 1 has TLOC1a and TLOC1b. Let's say WAN Edge 2 has TLOC2a and TLOC2b. For WAN Edge 1: TLOC1a will form tunnels to TLOC2a and TLOC2b (2 tunnels). TLOC1b will form tunnels to TLOC2a and TLOC2b (2 tunnels). So, WAN Edge 1 forms a total of 4 data-plane tunnels. The same applies to WAN Edge 2. Therefore, each WAN Edge forms 4 data-plane tunnels.