What are Cisco firewalls? A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules. Firewalls have been a first line of defense in network security for over 25 years. They establish a barrier between secured and controlled internal networks that can be trusted and untrusted outside networks, such as the Internet.

The latest research from the Uptime Institute reveals the main reasons behind IT service problems and data center shutdowns, providing important insights into the difficulties organizations face in maintaining operational resilience.