Azure firewall is a stateful or stateless firewall ?

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Azure Firewall is a stateful firewall. It keeps track of the state of the connections passing through it, and only allows traffic that is part of an established connection. The firewall uses a combination of network-level rules and application-level rules to control inbound and outbound traffic.

When a connection is initiated, Azure Firewall creates a state table entry to track the connection. Incoming traffic that matches an established connection state is allowed through the firewall, while incoming traffic that does not match an established connection state is dropped.

This stateful inspection provides an extra layer of security by ensuring that only legitimate traffic that is part of an established connection is allowed through the firewall. It also helps to protect against certain types of attacks, such as spoofing and replay attacks.

It's important to note that Azure Firewall uses stateful rules, but it also has capabilities that makes it a next-gen firewall like FQDN filtering, IP flow verification, and Azure Services filtering. 

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