Active Defense - A Comprehensive Guide to Network Security by Chris Brenton, Cameron Hunt

By Chris Brenton, Cameron Hunt

In a single booklet, Brenton and Hunt take care of all of the significant concerns you face in the event you have the desire to make your community safe. The authors clarify the necessity for defense, determine a few of the safeguard dangers, convey find out how to layout a safety coverage and illustrate the issues negative safeguard can enable to occur. Paying person cognizance to NetWare, home windows and Unix environments, they describe how networks function, and the authors speak about community cables, protocols, routers, bridges, hubs and switches from a safety point of view. Brenton and Hunt discover protection instruments comparable to firewalls, Cisco router configuration settings, intrusion detection platforms, authentication and encryption software program, digital inner most Networks (VPNs), viruses, trojans and worms.

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Extra resources for Active Defense - A Comprehensive Guide to Network Security

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Rather, this is the layer that is responsible for determining when access to network resources is required. For example, Microsoft Word does not function at the application layer of the OSI model. If a user tries to retrieve a page 33 Active Defense — A Comprehensive Guide to Network Security document from her home directory on a server, however, the application layer networking software is responsible for delivering her request to the remote system. Note In geek lingo, the layers are numbered in the order I’ve described them.

Any packets it receives are checked for errors and passed along to Router A. When Router A receives the frame, it performs an error check again. It then references its tables and realizes it needs to forward the frame to Router B in order to reach Network 4. Router B would again receive the frame and send it back to Router A. This is called a routing loop. Each router plays hot potato with the frame, assuming the other is responsible for its delivery and passing it back and forth. While our example describes only one frame, imagine the amount of bandwidth lost if there is a considerable amount of traffic destined for Network 4.

While this is important in modem communications, where a small amount of noise or a crossed line can kill a communication session, it is not as useful with network-based communication. TCP and SPX originate from the days when the physical and data-link layers could not always be relied on to successfully transmit information. These days, this is less of a concern because reliability has increased dramatically from the earlier years of networking. Connectionless Communications A connectionless protocol does not require an initial handshake or acknowledgments to be sent for every packet.

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