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The very nature of networking makes networks vulnerable to a dizzying array of threats By definition, a network must allow multiple users to access serving systems, but at the same time we must protect the network from harm Who are the people creating this threat The news may be full of tales about hackers and other malicious people with nothing better to do than lurk around the Internet and trash the peace-loving systems of good folks like us, but in reality hackers are only one of many serious network threats You will learn how to protect your networks from hackers, but first I want you to appreciate that the average network faces plenty more threats from the folks who are authorized to use it than those who are not authorized Users with good intentions are far more likely to cause you trouble than any hacker Additionally, don t think all network threats are people Let s not forget natural disasters like floods and hurricanes Even third parties can unintentionally wreak havoc what will you do if your building suddenly lacks electricity So a network threat can be any number of things that share one essential feature: the potential to damage network data, machines, or users The first order of business, therefore, is to stop and think about the types of threats that face the average network As we define the threats, we can discuss the many tools and methods used to protect our precious networks from intentional harm

In the event that a Token Card loses its synchronization with the server, a message will appear at login to NAS, to the effect of "Token out of Sync " To fix this, attempt to log in again, and when issued a challenge, press the CH/MAC key on the Card and type challenge into the card Type the Card's response into the terminal, and resynchronization is complete If this doesn't work, there may be a problem with the card; see your administrator

EXAMPLE 46 Show that cos 2 z + sin 2 z = 1 SOLUTION We start by writing z = x + iy and utilize the fact that cos 2 x + sin 2 x = 1, when x is a real variable Using the result of the last example we have sin( x + iy) = sin x cos iy + cos x sin iy cos( x + iy) = cos x cos iy sin x sin iy Therefore sin 2 z = (sin x cos iy + cos x sin iy)2 = sin 2 x cos 2 iy + cos 2 x sin 2 iy + 2 cos x sin x cos iy sin iy cos 2 z = (cos x cos iy sin x sin iy)2 = cos 2 x cos 2 iy + sin 2 x sin 2 iy 2 cos x sin x cos iy sin iy So it follows that cos 2 z + sin 2 z = sin 2 x cos 2 iy + cos 2 x sin 2 iy + 2 cos x sin x cos iy sin iy + cos 2 x cos 2 iy + sin 2 x sin 2 iy 2 cos x sin x cos iy sin iy = cos 2 x cos 2 iy + sin 2 x cos 2 iy + cos 2 x sin 2 iy + sin 2 x sin 2 iy = cos 2 iy (cos 2 x + sin 2 x ) + sin 2 iy (cos 2 x + sin 2 x ) = cos 2 iy + sin 2 iy Now we expand each terms using Euler s identity: ei ( iy ) + e i ( iy ) cos iy = 2

NOTE Be aware that in some circles, the term hacker describes folks who love the challenge of overcoming obstacles and perceived limitations and that s a positive thing! At least for this chapter we will define a hacker as an unauthorized person who is intentionally trying to access resources on your network

Following are the other CryptoCard settings available to you while running CryptoCard Admin User Profiles Step 7 in the procedure just above initializes the CryptoCard This step-by-step initialization is based on user profiles previously configured Settings for the user profile are converted to three-digit decimal codes for input into the Card during initialization A default user profile is established with the most common settings (initial PIN, the number of failed login attempts before lockout, and so on) This default profile will be used for all Card initializations, but it can be modified on a per-user basis If you wish to change this default setting, select File | Profile User Group Reassignment If at any point a user needs to be reassigned to another group, simply drag and drop the user from the old group to the new group This has no effect on settings or authentication

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The threats to your network are real and widespread Here s a list of some of the more common potential threats to your network The sections that follow give details on those threats and explain how to deal with them