| A basic understanding of computer networks is | | | | of firewalls. |
| necessary for understanding the elements and | | | | |
| principles of the Internet security. There | | | | 1. Application gateways are the first |
| are tools that can be used to reduce the | | | | firewalls and are known as proxy gateways. |
| number of networking attacks. In the modern | | | | They are created from hosts which use |
| world of risk to the security computers, a | | | | particular software for acting as a proxy |
| corporation needs to use a multilayered | | | | server. The application gateways are |
| approach in order to protect the information | | | | considered to be the most secure as they do |
| located on the computer from network attacks. | | | | not permit anything to pass by default. |
| The difference of the national security from | | | | Before using it and the Internet one must be |
| a corporate cyber security is in its large | | | | proxitized. However, they have a drawback - |
| scale of security issues, problems that have | | | | they are slow in the process. |
| to be solved. Weaknesses in broadly used | | | | |
| software and hardware products can create | | | | 2. Packet filtering is a tool with the help |
| problems at the national level, thus, | | | | of which routers have access control lists |
| requiring coordinated activities for the | | | | turned on. There is little overhead in packet |
| development of improved technologies. | | | | filtering as the access control tool is |
| Besides, the lack of trained professionals is | | | | fulfilled at a lower ISO/OSI layer. Besides, |
| the issue of a national level concern. The | | | | a packet filtering gateway is usually faster |
| national cyber security focuses on preventing | | | | than application gateways. Still, there are |
| and protecting against cyber attacks at a | | | | disadvantages of using it as TCP/IP has no |
| national level. It is aimed at securing | | | | possibilities to guarantee the correctness of |
| information infrastructures of the USA. | | | | the source address. |
| | | | |
| A firewall is a powerful technology used for | | | | 3. Application gateway and packet filtering |
| host protection at a corporation. It can | | | | are useful tools in a cyber security issue. |
| reduce the risk exposure introduced by | | | | However, there exist hybrid systems, which |
| internetworking hosts, defend the network | | | | unite the security of the application layer |
| against attacks. It simply blocks access to | | | | gateways with the flexibility and speed of |
| ports, IP addresses, protocols and services | | | | packet filtering. Hybrid systems are highly |
| to prevent the network threats. Many | | | | recommended for corporations. |
| corporations use one of three possible types | | | | |