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Answer Posted / s.m.feroz ahmed
Hi,
A Firewall is a device and allows Interested Traffic into
different Networks.A Firewall is placed outside Network for
packet filtering and allowing Interested Traffic inside
Network and to stop attacks.A stateful packet filtering
firewall is also known as Deep Injection Firewall.
Firewall Architechture consists of outside ,inside and DMZ
Network.Ethernet (E0) is always considered as Outside
Network by default and is recommended in Cisco ASA.E1 and
E2 are always considered as inside and DMZ network.Always
Outside Network will have Security-Level 0 and Inside
Network with Security-level 100 and DMZ as 50 .
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