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

By Chris Brenton, Cameron Hunt

In a single e-book, Brenton and Hunt care for all of the significant concerns you face should you have the desire to make your community safe. The authors clarify the necessity for safeguard, determine some of the protection dangers, express the best way to layout a safety coverage and illustrate the issues bad protection can let to take place. Paying person consciousness to NetWare, home windows and Unix environments, they describe how networks function, and the authors talk about community cables, protocols, routers, bridges, hubs and switches from a safety standpoint. Brenton and Hunt discover safeguard instruments corresponding to firewalls, Cisco router configuration settings, intrusion detection structures, authentication and encryption software program, digital deepest Networks (VPNs), viruses, trojans and worms.

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

Sample text

A non-routable protocol has no direct method of traveling between logical networks. A NetBIOS frame is incapable of crossing a router without some form of help. Routers page 35 Active Defense — A Comprehensive Guide to Network Security Routers are used to connect logical networks, which is why they are sometimes referred to in the IP world as gateways. 6 shows the effect of adding a router to a network. Notice that protocols on either side of the device must now use a unique logical network address.

It also helps to define how each piece will be connected to the others. 4 is a representation of the OSI model in all its glory. Let’s take the layers one at a time to determine the functionality expected of each. 4: The OSI model Physical Layer The physical layer describes the specifications of our transmission media, connectors, and signal pulses. A repeater or a hub is a physical layer device because it is framestupid and simply amplifies the electrical signal on the wire and passes it along.

Connectionless Communications A connectionless protocol does not require an initial handshake or acknowledgments to be sent for every packet. When you use a connectionless transport, it makes its best effort to deliver the data but relies on the stability of the underlying layers, as well as application layer acknowledgments, to insure that the data is delivered reliably. IP’s User Datagram Protocol (UDP) and IPX’s NetWare Core Protocol (NCP) are examples of connectionless transports. Both protocols rely on connectionless communications to transfer routing and server information, as well.

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