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A large part of the entire networking process involves one computer requesting something from another computer A Web client might ask for a Web page, for example, or a Common Internet File System (CIFS) client might ask a file server for access to a folder A computer far away might ask another computer for access to a private network Whatever the case, you should carefully assign levels of access to your resources This is authorization To help define how to assign levels of access, you use an access control list An access control list (ACL) is nothing more than a clearly defined list of permissions that specify what an authenticated user may perform on a shared resource Over the years the way to assign access to resources has changed dramatically To help you to understand these changes, the security industry likes to use the idea of ACL access models There are three types of ACL access models: mandatory, discretionary, and role-based In a mandatory access control (MAC) security model, every resource is assigned a label that defines its security level If the user lacks that security level, he or she does not get access MAC is used in many operating systems to define what privileges programs have to other programs stored in RAM The MAC security model is the oldest and least common of the three Discretionary access control (DAC) is based on the idea that there is an owner of a resource who may at his or her discretion assign access to that resource DAC is considered much more flexible than MAC Role-based access control (RBAC) is the most popular model used in file sharing RBAC defines a user s access to a resource based on the roles the user plays in the network environment This leads to the idea of creation of groups A group in most networks is nothing more than a name that has clearly defined accesses to different resources User accounts are placed into various groups A network might have a group called Sales on a Web server that gives any user account that is a member of the Sales group access to a special Web page that no other groups can see.

Point-to-point (p-node)

Keep in mind that these three types of access control are models Every TCP/IP application and operating system has its own set of rules that sometimes follow one of these models, but in many cases does not But do make sure you understand these three models for the CompTIA Network+ exam!

We can also assume the existence of an inverse mapping, which we denote by z = g( w) The inverse mapping is analytic on the polygon s interior Moreover, it is continuous in the interior of the polygon and on it s boundary The boundary of the polygon is mapped onto the real axis Suppose that the vertices of the polygon are mapped onto the points of the real x axis denoted by x1 , x 2 , , x n Now, since w = f ( z ), it follows that dw = f ( z ) dz (101) Next we assume that the mapping and its inverse w = f ( z ), z = g( w) are analytic on the sides of the polygon in addition to its interior Picking a point w on the polygon which is not a vertex, the image of w is a point z The point dz is a positive vector on the real axis x This is shown in Fig 102 It should follow that dw is a vector on the edge of the polygon pointing in the positive sense (in the counterclockwise direction) This is shown in Fig 103 The arguments of f and w are then related in the following way: dw arg[ f ( z )] = arg dz (102)

Mixed (m-node)

Now that you have a conceptual understanding of encryption, nonrepudiation, authentication, and authorization, it s time to see how the TCP/IP folks have put it all together to create standards so that you can secure just about anything in TCP/IP networks TCP/IP security standards are a rather strange mess Some are authentication standards, some are encryption standards, and some are so unique to a single application that I m not even going to talk about them in this section and instead will wait until the Secure TCP/IP Applications discussion at the end of this chapter There s a reason for all this confusion: TCP/IP was never really designed for security As you read through this section, you ll discover that almost all of these standards either predate the whole Internet, are slapped-together standards that have some serious issues, or, in the case of the most recent standards, are designed to combine a bunch of old, confusing standards So hang tight it s going to be a bumpy ride!

Hybrid (h-node)

Figure 103 If we take dz to be a positive pointing vector on the real axis, then dw is a vector on the edge of the polygon pointing in the positive sense