1. How corporate Firewall Works
1.FIREWALL
2.A CHOKE ROUTER
3.PROXI SERVER
4.A PERIMETER NETWORK
5.REFERENCE

2. FIREWALL
hardware or software put into the network to control
and/or prevent communication forbidden by the
network policy and/or intrusions from the Internet.
You can think of it as a wall that blocks communication
with the outside world. The management of a firewall
will consist of opening just the channels (ports) you
need to communicate. This paragraph needs work
A firewall often has routing capabilities to allow DMZs
or honeypots to be used to keep local users separate
from Internet server traffic.