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could understand the data created on the system of another manufacturer. Even if the data formats were compatible, most of the data had to be moved via sneaker net (a humorous term meaning you had to put the data from one system on a disk and actually walk presumably in your sneakers to the other machine to insert the disk and copy the data onto that system) because few devices could communicate on a network at all, let alone interoperate with different makes and models of equipment. However, a solution was on the horizon. In 1978, the International Organization for Standardization (ISO) introduced the OSI reference model. This model provided a common blueprint for all makers of networking hardware and applications. Using a layered approach, the model defines how networking hardware and software should function and how data should be handled and controlled. By using this blueprint, manufacturers could ensure that their equipment and software would interoperate with systems and applications from other makers. The OSI model specifies how certain parts of the network should work to support communication between applications on different computers. The actual mechanics of how the specification is implemented are entirely up to the manufacturer. In the end, manufacturers had a tool that helped them design their network standards for cross-platform compatibility and at the same time gave them flexibility in their implementation of the standard.

A placeholder in an inheritable ACE. When the ACE is inherited, the system replaces this SID with the SID of the object s current owner. Any user who accesses the computer over a dial-up connection.

Everyone. All users who access the computer, including Guests and Users from other domains. By default, Everyone includes Authenticated Users and Guests, but not Anonymous logons. Interactive. Any user who logs on locally. Network.

session. The following security principals apply to any nonhuman user that is using the computer in a specified way:

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Local Service. Services that are local to the computer, have no need for extensive local privileges, and do not need authenticated network access. A service running as Local Service has significantly less authority than a service running as System, both locally and on the network. When services running as Local Service access local resources, they do so as members of the local Users group. When they access network resources, they do so as Anonymous users.

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Services that have no need for extensive local privileges but do need authenticated network access. A service running as Network Service has the same network access as a service running as System, but it has significantly reduced local access. When services running as Network Service access local resources, they do so as members of the local Users group. When they access network resources, they do so using the SID assigned to the computer. Any service. The operating system.

A hierarchy of layers are used in the OSI model to ensure that developers focus on a single component, such as a program that converts files from one format to another, without worrying about how other components at other layers work The OSI model also specifies how items operating at one layer of the design should interface with items at adjacent layers of the design By using this model, equipment and software can be developed in a modular fashion Suppose a developer needs to specify how data is encrypted before being transmitted between hosts Using the OSI model s layer approach, the developer does not have to worry about how the data is packaged for transmission across the network after encryption because that issue is dealt with by another layer.

Built-in security principals are used to manage the rights and restrictions that apply to users based on the type of logon session they have initiated. For example, suppose there is a file or share that you want Alice to be able to access but only when she is logged on interactively. You can accomplish this by allowing Alice access to the resource but denying access to requests accompanied by access tokens that include the Dialup security principal. The following security principles are available when a computer running Windows XP Professional is a member of a domain:

Often, it s difficult to select a particular control. To see all the controls in the currently displayed form, you first have to click the form, and then you can select from the drop-down list at the top of the Properties window. Figure 6-2 shows the drop-down list for the splash screen form. To select any particular control, highlight it in the list, which will select it on the design surface.

An identity used by a process that is executing in a restricted security context. When code executes at the restricted security level, the Restricted SID is added to the user s access token.