By Chris Brenton, Cameron Hunt
In a single ebook, Brenton and Hunt take care of the entire significant concerns you face in case you have the desire to make your community safe. The authors clarify the necessity for safety, establish some of the safety hazards, express find out how to layout a safety coverage and illustrate the issues bad safety can enable to take place. Paying person realization 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 protection instruments reminiscent of 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
The third column is a brief description of the functionality provided by the service. 6 is only a brief listing of IP services. More information can be found in request for comment (RFC) 1700. 3 nntp 119/tcp Network News Transfer ntp 123/tcp Network Time Protocol ntp 123/udp Network Time Protocol netbios-ns 137/tcp nbns netbios-ns 137/udp nbns netbios-dgm 138/tcp nbdgm netbios-dgm 138/udp nbdgm netbios-ssn 139/tcp nbssn snmp 161/udp Simple Network Managemen t protocol snmp-trap 162/udp Simple Network Managemen t protocol These port numbers are not UNIX-specific.
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. With all these frames looping between the two routers, there would be very little bandwidth available on Network 2 for any other systems that may need to transmit information. Fortunately, the network layer has a method for eliminating this problem, as well. As each router handles the frame, it is required to decrease a hop counter within the frame by 1.
In fact, they do not even verify that this information was sent from Router B or that Router B even exists! Needless to say, this lack of verification can be a gaping security hole. It is not all that difficult to propagate bogus routing information and bring an entire network to its knees. This is a clear example of how one savvy but malicious user can interrupt communications for an entire network. Because of this security concern and the other problems we’ve noted, many organizations use static routing or have deployed link state routing protocols such as OSPF (Open Shortest Path First).