By Chris Brenton, Cameron Hunt

ISBN-10: 0585476934

ISBN-13: 9780585476933

ISBN-10: 0782129161

ISBN-13: 9780782129168

In a single e-book, Brenton and Hunt take care of the entire significant matters you face if you need to make your community safe. The authors clarify the necessity for defense, establish a few of the safeguard hazards, express tips to layout a safety coverage and illustrate the issues bad defense can let to ensue. Paying person realization 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 viewpoint. Brenton and Hunt discover safety instruments resembling firewalls, Cisco router configuration settings, intrusion detection platforms, authentication and encryption software program, digital deepest Networks (VPNs), viruses, trojans and worms.

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

Example text

When static routing is used, most workstations receive an entry for the default router only. For example, let’s assume I configure my system to have a default route that points to the router Galifrey. As my system passes information through the network layer, it will analyze the logical network of the destination system. If the system is located on the same logical network, the data-link layer adds the MAC address of that system and transmits the frame onto the wire. If the system is located on some other logical network, the data-link layer will use the MAC address for Galifrey and transmit the frame to it.

5 would be broadcast with only the direct common network information being removed (Network 1). This means that while Router A was updating Router B with the information it had learned from Router C, it was also relaying back the route information originally sent to it by that router (Router B). The only difference is that Router A has increased by 1 each hop count reported by Router B. Because the hop value is larger than what Router B currently has in its tables, Router B would simply ignore this information.

Or send some form of acknowledgment (ACK) to let you know he has not yet hung up. When the conversation is complete, you would both tear down the connection by saying goodbye, which is a handshake to let each other know that the conversation is complete and that it’s OK to hang up the phone. Once you hang up, your connection-oriented communication session is complete. The purpose of connection-oriented communications is simple. They provide a reliable communication session when the underlying layers may be considered less than stable.

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

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