Firewall Configuration Configure host-based and cloud firewalls for network security. When to Use This Skill Use this skill when: - Setting up a new server and need to restrict network access - Implementing network segmentation between application tiers - Configuring cloud security groups for AWS, GCP, or Azure resources - Migrating from iptables to nftables - Auditing existing firewall rules for compliance - Responding to a security incident requiring emergency network blocks Prerequisites - Root or sudo access on Linux hosts - AWS CLI configured for cloud security groups - Understanding of…