IP spoofing replaces the untrusted source IP address with a fake, trusted one, to hijack connections to your network. Attackers use IP spoofing to send malware and bots to your protected network, to execute DoS attacks, or to gain unauthorized access.

Azure monitors the health of a Virtual Machine Scale Set (VMSS) deployment using health probes, typically on TCP port 8117. These probes check the availability of the VMs within the scale set by sending traffic to ensure they are functioning properly. If any VM fails the health probe, Azure can take automated actions like removing the unhealthy instance and replacing it.

The abbreviation REST stands for "Representational State Transfer" and refers to a software architectural style. It is based on six principles that describe how networked resources are defined and addressed on the web, for example in a cloud.