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Security and Open Systems Interconnect (OSI) Security and Open Systems Interconnect (OSI) Tony NTC/410, Network and Telecommunications Concepts II Mr. Li July 9,
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the security problems the Internet can cause; but not everything. By understanding the different Open Systems Interconnect (OSI) levels and security threats involved
MEMORANDUM TO: Network Group FROM: Student SUBJECT: Security and the OSI Model The Open Systems Interconnect (OSI) Model is the basis on which network communications
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Security and Open Systems Interconnect (OSI)
Tony
NTC/410, Network and Telecommunications Concepts II
Mr. Li
July 9, 2005
Security and Open Systems Interconnect (OSI)
Security to networks and data has been a concern since the introduction of the Personal Computer (PC) in the work place. There always seems to be someone who wants gain unauthorized access. Below are a few areas that an administrator can look into to help secure their system.
File Security and Firewalls
File Security is keeping unauthorized access to your data. Encryption and password security is normally the best way to keep your data in the correct hands. Another way is install a firewall. A firewall is a system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both and are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet. There are several types of firewall techniques:
Packet Filter: Packet filtering looks at each packet entering or leaving the network and accepts or rejects it based on user-defined rules. Packet filtering is fairly effective and transparent to users, but it is difficult to configure. In addition, it is susceptible to IP spoofing.
Application Gateway: Application gateway applies security mechanisms to specific applications, such as FTP and Telnet servers. This is very effective, but can cause performance degradation.
Circuit-Level Gateway: This applies security mechanisms when a TCP or UDP connection is established. Once the connection has been made, packets can flow between the hosts without further checking.
Proxy Server: This intercepts all messages entering and leaving the network. The proxy server effectively hides the true network addresses.
In practice, many firewalls use two...
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