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

By Chris Brenton, Cameron Hunt

In a single publication, Brenton and Hunt take care of all of the significant matters 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 defense hazards, express how you can layout a safety coverage and illustrate the issues negative safeguard can permit to take place. 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 standpoint. Brenton and Hunt discover protection instruments equivalent to firewalls, Cisco router configuration settings, intrusion detection structures, authentication and encryption software program, digital inner most Networks (VPNs), viruses, trojans and worms.

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

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Notice that protocols on either side of the device must now use a unique logical network address. Information destined for a non-local system must be routed to the logical network on which the system resides. The act of traversing a router from one logical network to another is referred to as a hop. When a protocol hops a router, it must use a unique logical network address on both sides. 6: The effects of adding a router to the network So how do systems on one logical network segment find out what other logical segments exist on the network?

The router replaces the source node address (originally Fritz’s node address) with the node address of Port B. It will also replace the destination node address (originally Port A) with the node address of Wren. In order for the router to communicate on both subnets, it needed two unique Note node addresses, one for each port. If Fritz were launching an attack against Wren, you could not use the source node address within the frame on Wren’s subnet in order to identify the transmitting system. While the source node address will tell you where the data entered this subnet, it will not identify the original transmitting system.

Once Router A receives a reply from Routers B and C, it creates a link state protocol (LSP) frame and transmits it to Routers B and C. An LSP frame is a routing maintenance frame that contains the following information: ƒ The router’s name or identification ƒ The networks it is attached to ƒ The hop count or cost of getting to each network ƒ Any other routers on each network that responded to its hello frame Routers B and C would then make a copy of Router A’s LSP frame and forward the frame in its entirety along through the network.

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