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What should you configure?

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(@katterjohnoctavio)
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You have a public load balancer that balances ports 80 and 443 across three virtual machines. You need to direct all the Remote Desktop Protocol (RDP) connections to VM3 only .

What should you configure?

  • A . a load balancing rule
  • B . a new public load balancer for VM3
  • C . an inbound NAT rule
  • D . a frontend IP configuration

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Suggested Answer: C

Explanation: To port forward traffic to a specific port on specific VMs use an inbound

network address translation (NAT) rule.

https://docs.microsoft.com/en-us/azure/load-balancer/load-balancer-overview

an inbound NAT rule :

Create a load balancer inbound network address translation (NAT) rule to forward traffic from a specific port of the front-end IP address to a specific port of a back-end VM. Hence this option is Correct

a load balancing rule : Incorrect Choice

A load balancer rule defines how traffic is distributed to the VMs. The rule defines the front-end IP configuration for incoming traffic, the back-end IP pool to receive the traffic, and the required source and destination ports.

a new public load balancer for VM3 : Incorrect Choice

This option will not help you since this will route all traffic to VM3 only.

a frontend IP configuration : Incorrect Choice

When you define an Azure Load Balancer, a frontend and a backend pool configuration are connected with rules. The health probe referenced by the rule is used to determine how new flows are sent to a node in the backend pool. The frontend (aka VIP) is defined by a 3-tuple comprised of an IP address (public or internal), a transport protocol (UDP or TCP), and a port number from the load balancing rule. The backend pool is a collection of Virtual Machine IP configurations (part of the NIC resource) which reference the Load Balancer backend pool.

References:

https://docs.microsoft.com/en-us/azure/load-balancer/tutorial-load-balancer-port-

forwarding-portal

https://pixelrobots.co.uk/2017/08/azure-load-balancer-for-rds/

   
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