Hub & Spoke Model...

In Cloud the Hub and Spoke Model is a Network architecture where one central network, called the HUB , is Connected to Multiple Networks, called SPOKES.

IT works as a Virtual Router with the Help of HUB we can reach there and we connect the servers in the SPOKE VCN. It provides the Private Connectivity between VCN's and External Network such as on-premises networks, VPN's and Fast Connect, without using the Public Internet.

Now, we will learn Advanced part of Networking...

DRG [Dynamic Routing Gateway]

If you want to go from one VCN to another VCN we need another Gateway..(DRG). (For this Internet Gateway will not work.) It is safest Gateway in the Industry.. It gives Access to the private IP. It never allow the public Traffic.. Only allow the Private Traffic (Application server).

In Practice Only we have to create the DRG and Connect to the HUB and SPOKE all Route will be Automatically Created..

HUB = Central Network.

SPOKE = Connected Networks.

+---------+        +---------+        +-------------+
|   DRG   |  --->  |   VCN   |  --->  | HUB / SPOKE |
+---------+        +---------+        +-------------+
                       |
                       |
                     Attach

---

                     (SPOKE 1)                                    
                          |
                          |
                          |
    (SPOKE 2)  ------ (  HUB  ) ------ (SPOKE 3)
                          |
                          |
                          |
                      (SPOKE 4)

---

                +----------------+
                |      DRG       |
                +----------------+
                   /          \
                  /            \
                 /              \
                v                v

      +----------------+    +-------------------+
      |    HUB VCN     |    |   SPOKE VCN        |
      |                |    |                    |
      | Public Subnet  |    |  Private Subnet    |
      |                |    |                    |
      |                |    | Application Server |
      +----------------+    +--------------------+

THANKYOU!