1. How Corporate Firewalls Work
● Firewall
● Internet Router(Choke Router)
● Finance
● Bastion Host

2. Firewall
● Firewall is hardware
equipped with software
to aim to control the
communication between
a certain specific
computer network and
the outside, and to
maintain the safety of an
internal computer
network or the software.

3. Internet Router(Choke Router)
● On the corporate network, this router checks all
the packets from the Internet and this internal
network.
● According to rules
determined by system
administrators, the
router allows or blocks
packets.

4. Finance
● The science of the
management of
money and other
assets.
● The management of
money, banking,
investments, and
credit.
● The supplying of
funds or capital.

5. Bastion Host
Bastion Host is the host between LAN and Internet.
Normally it is mounted application gateway or
circuit gateway.
It must have strict security.

6. References
http://itpro.nikkeibp.co.jp/dictionary/index.html
http://ja.wikipedia.org/wiki/