What kind of firewall is the opensource IPtables firewall commonly found on Linux Distros?

What technology is used on firewalls that process stateful packet inspections at the hardware level and as close to the line rate as possible?

A Stateful Packet Inspection firewall maintains a "BLANK", which is also just a list of active connections.

What device should be the front line defense in your network?

Ports up to "BLANK" are considered well known ports.

Which particular generation firewall are stateless in nature ?

Which type of Firewalls keep a track on the state of the connection?

What does sniffing mean?

Suppose Eric is a Network Security Engineer in ABC Company. He is asked by his manager to block the access to unauthorized web sites being accessed by the users of the company. Can these unauthorized web sites be blocked with the Firewalls?

Suppose Matt is the Network Security Engineer for XYZ Company. He is asked by his manager to create a security policy in the Firewalls so that host_A(172.16.0.3) may be able to access the HTTP service from the internet cloud. NAT rule already exists for the host. How will Matt create the security policy in the Firewalls?

Generally, a Firewall can not be managed by which of the following: