AZ-104 – Question 177

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HOTSPOT –
You have an Azure subscription named Subscription1.
Subscription1 contains the virtual machines in the following table:

Subscription1 contains a virtual network named VNet1 that has the subnets in the following table:

VM3 has multiple network adapters, including a network adapter named NIC3. IP forwarding is enabled on NIC3. Routing is enabled on VM3.
You create a route table named RT1 that contains the routes in the following table:

You apply RT1 to Subnet1 and Subnet2.
For each of the following statements, select Yes if the statement is true. Otherwise, select No.
NOTE: Each correct selection is worth one point.
Hot Area:

Correct Answer: 

IP forwarding enables the virtual machine a network interface is attached to:
✑ Receive network traffic not destined for one of the IP addresses assigned to any of the IP configurations assigned to the network interface.
✑ Send network traffic with a different source IP address than the one assigned to one of a network interface’s IP configurations.
The setting must be enabled for every network interface that is attached to the virtual machine that receives traffic that the virtual machine needs to forward. A virtual machine can forward traffic whether it has multiple network interfaces or a single network interface attached to it.

Box 1: Yes –
The routing table allows connections from VM3 to VM1 and VM2. And as IP forwarding is enabled on VM3, VM3 can connect to VM1.

Box 2: No –
VM3, which has IP forwarding, must be turned on, in order for VM2 to connect to VM1.

Box 3: Yes –
The routing table allows connections from VM1 and VM2 to VM3. IP forwarding on VM3 allows VM1 to connect to VM2 via VM3.
Reference:
https://docs.microsoft.com/en-us/azure/virtual-network/virtual-networks-udr-overview https://www.quora.com/What-is-IP-forwarding

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