Question: a) Why are screening routers used in a firewall architecture? b) Why are internal firewalls desirable? c) Why is it easier to create appropriate ACL

a) Why are screening routers used in a firewall architecture?
b) Why are internal firewalls desirable?
c) Why is it easier to create appropriate ACL rules for server host firewalls than for border firewalls?
d) How does the use of border, internal, and host firewalls provide defense in depth?

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