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== Firewall Policies ==
At the core of a firewall's operation are the policies that govern its decision-making process. These policies, collectively known as firewall rules, are the specific guidelines that determine the traffic allowed or blocked across a network's boundaries.<ref>{{Cite web |title=Policy |url=https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-admin/policy |access-date=2024-11-21 |website=docs.paloaltonetworks.com}}</ref><ref name="auto">{{Cite web |title=Creating Firewall Policy Rules {{!}} Juniper Networks |url=https://www.juniper.net/documentation/us/en/software/nm-apps24.1/junos-space-security-director/topics/task/junos-space-firewall-policy-rule-creating.html |access-date=2024-11-21 |website=www.juniper.net}}</ref>
Firewall rules are based on the evaluation of network packets against predetermined security criteria. A network packet, which carries data across networks, must match certain attributes defined in a rule to be allowed through the firewall. These attributes commonly include:
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=== USER ID ===
Implementing firewall rules based on IP addresses alone is often insufficient due to the dynamic nature of user ___location and device usage.<ref
This is where the concept of "User ID" makes a significant impact. User ID allows firewall rules to be crafted based on individual user identities, rather than just fixed source or destination IP addresses. This enhances security by enabling more granular control over who can access certain network resources, regardless of where they are connecting from or what device they are using.
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