The Effectiveness of Firewall, IDS, IPS, and ACL Firewall A firewall is a device that provides secure connectivity between networks. A firewall is hardware or software designed to permit or deny network transmissions based upon a set of rules and is frequently used to protect networks from unauthorized access while permitting legitimate communication to pass. A Firewall monitors the Incoming traffic by applying a set of rules I.e Access Control Rules. You can create or disable firewall filter rules, based on conditions as: l IP Addresses l Domain Names l Protocols (allowed/blocked) l Keywords (permit/deny) Hardware vs Software Firewalls Properties Hardware Firewall Software Firewall Cost Expensive Comparatively Cheaper Complexity Complex Simple Upgrades Difficult to Upgrade Easy to Upgrade(Users can simply download patches, fixes, and updates) Configuration Difficult to Configure Can be easily installed Idea...