Free Cisco 300-730 SVPN Actual Exam Questions - Question 7 Discussion

The GRE tunnel key (A) needs to be consistent so tunnels can establish securely and properly. Without matching keys, the GRE tunnels won’t form even if NHRP IDs are correct.

Maybe A makes sense since the GRE tunnel key is used to identify and secure the tunnel. If it’s different, routers might not establish proper GRE tunnels even if NHRP IDs match.

D imo, the EIGRP split-horizon setting has to be consistent too, especially since Phase 3 allows spoke-to-spoke tunnels, and split-horizon controls route advertisement. If it’s mismatched, routing updates might get blocked, messing up connectivity. While NHRP network ID (B) defines the cloud, consistent split-horizon settings ensure routes actually flow correctly between spokes. So, it’s not just about identifying the cloud but also making sure routing info passes as expected.

It’s B. The NHRP network ID defines the DMVPN cloud boundary, so all routers have to match it to communicate properly. The GRE tunnel key or VRF can differ without breaking the cloud itself.

A/C? The GRE tunnel key (A) is crucial for security, but the tunnel VRF (C) also needs to be consistent to ensure traffic flows in the right routing context across all routers.

It’s B because the NHRP network ID uniquely identifies the DMVPN cloud, so if it’s different, routers won’t recognize each other as part of the same network. That’s key for Phase 3.

A imo, while NHRP network ID is important, the GRE tunnel key is what actually ties all the tunnels together securely on all routers. Without the same GRE tunnel key, the tunnels won’t establish right, no matter what the NHRP or VRF settings are. So this one feels more fundamental for Phase 3 to function smoothly.

B, NHRP network ID has to be the same across all routers for DMVPN Phase 3 to work properly.