1. How Corporate Firewalls Work
Firewall
●
Proxy server
●
Access router
●
Bastion host
●

2. Firewall
A firewall is a
dedicated appliance,
or software running on
another computer,
which inspects
network traffic passing
through it, and denies
or permits passage
based on a set of
rules.

3. Proxy server
In computer networks,
a proxy server is a
server (a computer
system or an
application program)
which services the
requests of its clients
by forwarding
requests to other
servers.