I'm feeling pretty confident about this one. Packet filtering in a firewall definitely happens at the network layer, where the firewall can examine the IP addresses and other network-level information to make access control decisions.
I'm a little confused on this one. I know firewalls operate at multiple layers, so I'm not sure if the packet filtering is specifically at the network layer or if it could be at another layer as well. I'll have to review my notes to be sure.
The network layer makes the most sense to me. That's where the firewall is inspecting the packet headers and making decisions about whether to allow or block the traffic.
Hmm, I'm a bit unsure about this one. I know firewalls work at the network layer, but I can't remember if the packet filtering specifically happens there or at a different layer. I'll have to think this through carefully.
I'm pretty sure it's the network layer, since that's where the firewall operates to filter packets based on IP addresses and other network-level information.
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