Azure Application gateway offers a web application firewall ( WAF ) that provides centralized protection of web applications from common exploits and vulnerabilities. Web applications are increasingly targeted by malicious attacks that exploit commonly known vulnerabilities. SQL injection and cross-site scripting are among the most common attacks.
Preventing such attacks in application code is challenging. It can require rigorous maintanence , patching and monitoring mulitple layers of the application topology. A centralized web application firewall helps make security management much simpler.
A WAF also gives application administrator better assurance of protection against threats and intrusions.
reference :
https://docs.microsoft.com/en-us/azure/web-application-firewall/ag/ag-overview
SLA for Application gateway :
We guarantee that each application gateway cloud service having two or more medium or larger instances will be available at least 99.95% of the time.
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