So welcome back, guys.
Now, next, we will going to learn the steps which are involved in Inter Milan routing.
So by now, you have all the knowledge that is required to understand the exact steps involved in Inter
Milan routing.
So in this topology we have host machine A, which is a source machine and this machine is present in
Vlan 12.
And this machine wants to send a data to another host machine B which is present in Vlan 11.
So the destination IP address of the destination machine B is 14 .1.1.4.
So in our example, the host machine A wants to send data to host machine B whose IP address is 14 .1.1.4.
Right.
Now you can see that the host machine A is present in Vlan 12, whereas destination machine B is present
in Vlan 11.
Right.
So this is the example where a data needs to go from its home subnet to the remote subnet.
So this is the example of routing across subnets.
Therefore, the host machine a which is a source machine, needs to send a frame or data to gateway
router first.
So you can see in this topology the host machine A knows that it is sending a data to a remote machine
which is present outside its local subnet and therefore the host machine A decides to send data to gateway
l3 router first.
Once the Gateway l3 router receives the data, then depending on its routing table, the Gateway L3
router reroutes the frame or data to a destination subnet.
Right.
So you can see that L3 router reroutes the frame such that the frame reaches its destination subnet.
Here the destination subnet is a subnet in which host machine B is present.
That is Vlan 11 is the destination subnet.
So here is a trip which you always remember that a frame or a packet cannot be transmitted from one
subnet to another without the help of L3 router.
So always keep this in mind that whenever a frame or a packet needs to be transmitted from its home
subnet to any destination machine present outside the local subnet of a source machine, then l3 router
is always involved.