Firewalls
Everyday millions of people around the world use the Internet for corporate use, research, and personal uses. If each person uses one computer to access the Net at any one time, that is trillions of bytes of data. People are in danger of being "infected" or "hacked" easily by brilliant hackers. What can a person do? The solution is to protect your computer using firewalls. Basically, a firewall is a barrier to keep destructive forces away from your computer. A firewall is simply a program or hardware device that filters the information coming through the Internet connection. If incoming information is unusual by the filters, it is not allowed through. Firewalls use one or more methods to control traffic flowing in and out of the network:- Packet Filtering: Packets (small bits of data) are analyzed through a set of filters and then let through into the computer or to be discarded later- Proxy Service - Information sent fro
One of the best things about a firewall from a security standpoint is that it stops anyone on the outside from logging onto a computer in your private network. The highest level of security would be to simply block everything. For most of us, it is probably better to work with the defaults provided by the firewall developer unless there is a specific reason to change it. Firewalls often implement service access policies that allow some user access from the Internet to selected internal hosts, but this access would be granted only if necessary and only if it could be combined with advanced authentication. The firewall design policy is specific to the firewall. A firewall that implements the second policy denies all services by default, but then passes those services that have been identified as allowed. Therefore putting a firewall in place provides peace of mind. This second policy follows the classic access model used in all areas of information security. There are two levels of network policy that directly influence the design, installation and use of a firewall system. It defines the rules used to implement the service access policy. - Restricted Access to Desirable Services- Large potential for Back doors- Little Protection from Insider AttacksThe level of security you establish will determine how many of these threats can be stopped by your firewall. You can always restrict traffic that travels through the firewall so that only certain types of information, such as e-mail can get through. Firewalls generally implement one of two basic design policies:- permit any service unless it is expressly denied, or- deny any service unless it is expressly permittedA firewall that implements the first policy allows all services to pass into the site by default, with exception of those services that the service access policy has identified as disallowed. The higher-level policy is an issue-specific, network access policy that defines those services that will be allowed or denied from the restricted network.
Common topics in this essay:
Stateful Inspection,
Insider Attacks,
Firewalls Everyday,
Service Information,
Filtering Packets,
Desirable Services,
access policy,
service access,
implement service access,
firewall implements policy,
service access policy,
service unless expressly,
policy firewalls implement,
service unless,
policy firewalls,
unless expressly,
firewall implements,
level security,
implement service,
firewalls implement,
internet connection,
|
Acceptance Essays
