Doubt in DM-VPN

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Hello,
I have a doubt about DM-VPN. Let me attach one picture here.

In the diagram below, when we refer to a P2P VPN connection, a common secure tunnel for an entire network is created or a secure tunnel for each host inside a particular network is created?
Thanks.

Also, How much do I need to know about GRE & NHRP Protocols for Network +? @wes-bryan

In this image, it says the NHRP server returns the public IP of the router. But, what is the use of getting just the Public IP of Default Gateway? We should have the IP Address of the client inside that network right? @wes-bryan

@wes-bryan Sir can you please tell

@Ronnie-Wong @wes-bryan Can anyone please answer my query :))

@Atharva-Bet,

NHRP (Next Hop Resolution Protocol) helps the client routers in DMVPN learn the public IP address of the other client routers so that it can cross a public network.

• NHRPClient routers will register their own public IP address with the Server router. In turn, the NHRP Server router will report the public ip address.

So that across a DMVPN infrastructure, instead of setting up a permanent site-to-site VPN tunnel between two non directly connected routers, each client will contact the NHRP server for the Public IP address of the router they want to connect to. So DMVPN are generally setup in a hub-and-spoke topology.

Once again, I emphasize, if you're preparing for the Network+ exam, this is beyond the knowledge and scope. If you like to learn more about this please consider taking a look into the CCNP ENCOR and ENARSI shows. I would recommend that you Network+ your priority as these tangents can take away precious time from you studying additional material towards your Network+ certification.

There is no harm in asking the question, but a single post will not be sufficient depth to cover details.