[cisb102sp04] cisb102 l3 q6 - firewall
- From: Tom Spare <etspare@xxxxxxxxx>
- To: lsitserv <cisb102sp04@xxxxxxxxxxxxx>
- Date: Wed, 18 Feb 2004 12:25:16 -0800 (PST)
I have chosen to talk about firewalls for are sixth question of lesson 3.
With the increasing number of broadband connections and home networks the
possibility of someone getting to your personal data is becoming more popular.
There are many ways to help secure your data, one of them is by using a
firewall*.
The purpose of firewalls are to control incoming and outgoing packets of
information. They act as Police officers, if you are good and behave the law
then they will let you continue on but if they suspect something is wrong they
will stop you. Firewalls come in a wide variety. They can be software or
hardware based and can cost anywhere between $40 to many thousand of dollars.
For the home user or small business you can usually purchase a router with a
firewall built in that is easy to setup. For the large companies you will
usually have someone who is certified in routers and firewalls to secure your
information. I am a big believer of the Cisco (www.cisco.com) product line of
routers and firewalls. They are one of the largest companies for these
devices. Cisco publishes a book called the Cisco IOS Software Command Summary
that is over 900 pages, it is nicknamed the "pocket guide" and it's not fully
detailed on their command language. If you wonder why you might need a
firewall you can find a nice write up here
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/centri4/user/scf4ch2.htm.
*Firewall - A firewall is a set of related programs, located at a network
gateway server, that protects the resources of a private network from users
from other networks. Basically, a firewall, working closely with a router
program, filters all network packets to determine whether to forward them
toward their destination. A firewall is often installed away from the rest of
the network so that no incoming request can get directly at private network
resources. There are a number of firewall screening methods. A simple one is to
screen requests to make sure they come from acceptable (previously identified)
domain names and IP addresses. For mobile users, firewalls allow remote access
in to the private network by the use of secure logon procedures and
authentication certificates. www.stallion.com/html/support/glossary.html
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