Security policy option in it to block traffics like

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security policy option in it to block traffics like FTP, HTTP, TCP/IP ports and protocols depending on the requirement. Some of the enterprise version of the firewall provide options to filter and block Trojans. Adwares, spamware and spyware. iii. DMZ Zone Short for d e m ilitarized z one , is a computer or a small sub network that sits between a trusted internal network, such as a corporate private LAN, and an un trusted external network, such as the public Internet. Typically, the DMZ contains devices accessible to Internet traffic, such as Web (HTTP) servers, FTP servers, SMTP (e-mail) servers and DNS servers. The term comes from military use, meaning a buffer area between two enemies. iv. NAT Connection Network Address Translation (NAT) is a network standard that enables a local area network (LAN) to use one set of IP addresses for intranet traffic and a second set of addresses for external traffic (Extranet Traffic). All necessary IP address translations occur where the LAN interfaces with the broader Internet. NAT converts the packet headers (and in some cases the port numbers in the headers) for incoming and outgoing traffic and keeps track of each session. This does mean, however, that NAT overrides Montclair State University Fall2004 Catherine Alexis 8
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Intranet Security "Internet transparency", a practice in which packets remain intact throughout their transmission. NAT is also provided with Windows Internet Connection Sharing. NAT accomplishes these key purposes: It acts as a firewall by hiding internal IP addresses. It enables an enterprise to use more internal IP addresses, since there is no possibility of conflict between its internal-only IP addresses and those used by other organizations. Essentially, an organization can present itself to the Internet with fewer IP addresses than used on its internal network, which conserves public IP addresses. It allows an enterprise to bundle multiple ISDN/T1 connections into one Internet connection. VII. Conclusion All the security features and policies described in this paper are some of the preventive measures that must be taken to protect an organization from the disaster of losing its valuable information. Apart from having all these policies and security features it becomes necessary to educate the users about the value of the information because security frauds often happen because of neglect and lack of knowledge of the user about the importance of securing of information. By securing the Intranet the organization can o Minimize potential economic loss o Decrease potential exposures o Ensure organizational stability o Provide an orderly recovery o Minimize insurance premiums o Reduce reliance on certain key individuals o Protect the assets of the organization o Ensure safety of personnel o Minimize decision-making during a disastrous event o Minimize legal liability Montclair State University Fall2004 Catherine Alexis 9
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Intranet Security Montclair State University Fall2004 Catherine Alexis 10
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