Understanding Network Security

  

To understand network security, you need to understand networking. Networks provide a means to transport packets either by Local Area Network (LAN), Metropolitan Area Network (MAN), or Wide Area Network (WAN). For the purpose of most security discussions, security can easily be broken down into the organization's enterprise domain and the Internet. The organization's enterprise domain is a LAN because it is local to the organization's internal users, and the organization's enterprise domain is a WAN to the users who are not trying to access the organization's domain locally. If users only need to access the domain locally, the only security issue is the trust it places in those users because external connections to the LAN can be prohibited .

The LAN for the organization usually contains a single domain. If more domains are registered for the organization, there are more LANs for that organization. Many services operate a LAN, such as FTP, Telnet, and Domain Name Service (DNS); through the years , protocols have been established to specify how these services communicate with each other. These services manage the domain and they know how to interpret the various packets from the network based on the connection information and data in the packet. These services act as listeners on the remote machine to accept connections from a client. A client is a process that wishes to start the communication, such as a user starting an FTP session to move files. The service is the process to retain the files and accept the communication if it believes that the client matches the protocol.

  


Java Security Solutions
Java Security Solutions
ISBN: 0764549286
EAN: 2147483647
Year: 2001
Pages: 222

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