you manage a small network at work. users use workstations connected to your network. no portable computers are allowed. as part of your security plan, you would like to scan all users' emails. you want to scan the emails and prevent any with malicious attachments from being received by users. your solution should minimize administration, allowing you to centrally manage the scan settings. which solution should you use?

Using access control techniques, network firewalls impose policies. Mechanisms are rules that govern how traffic should be handled based on its attributes.
These rules can be established policies, allow/deny rulesets, or other rules.
The four TCP/IP communication layers—application, transport, IP/network, and hardware/data link—are the ones that are subject to scrutiny by network firewalls.
From the point of origin to the point of destination, data is moved by TCP/IP layers.
The number of higher order levels that can be checked increases with the level of network firewall security technologies.
Advanced network firewalls can offer more precise traffic restrictions and thorough accounting since they can collect more information.

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