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This allows the developer to focus solely on making sure that the piece he or she is working on interacts correctly with the layers above and below it in the manner specified by the OSI model The structure of a shipping company provides a good analogy for how a layered system works A shipping company usually has a general management department, a sales department, distribution managers, warehouse workers, and truck drivers Each of these groups can be thought of as a separate layer Each one depends on the services of the departments (layers) adjacent to them, and for the most part, they are unconcerned about the needs of departments (layers) that are not directly related to them The truck drivers need the services of the warehouse crew to locate and deliver materials.

A placeholder in an ACE on a User, Group, or Computer object in Active Directory. When you grant permissions to Self, you grant these permissions to the security principal represented by the object. During an access check, the operating system replaces the SID for Self with the SID for the security principal represented by the object.

Warning It is recommended that you not remove or change the permissions that pertain to the built-in security principals themselves.

In Windows NT 4.0, the Everyone group is used as a catchall for file system ACLs, registry ACLs, and user rights. An administrator cannot define who does and does not belong to the Everyone group. Instead, Windows NT 4.0 automatically controls the group membership so that everyone is a member of the Everyone group. If an administrator wants more granular access control, the default ACLs have to be modified in order to remove the Everyone group and add groups that the administrator can control. In Windows 2000 and later, groups whose membership is automatically configured by the operating system, such as Everyone and Authenticated Users, are not used to assign permissions to file and registry objects. Only those groups whose membership can be controlled by

However, the truck operators are not likely to be concerned with the details of how the sales people operate Each department (layer) might change how it accomplishes its tasks, and a department might turn over employees, but the general rules for interlayer communication do not change The management team still needs to notify sales if there is.

Part III:

an administrator primarily Users, Power Users, and Administrators are used to assign permissions. When users are members of a group, they automatically have the permissions that have been assigned to that group. The users that constitute the default memberships in these groups are listed in Table 17-1.

Table 17-1

If you are using a wireless access point as a residential gateway to the Internet rather than using ICS, you will use infrastructure mode, and all computers will connect to the network through the wireless access point. The advantage to this configuration over an ad hoc network is that you do not need a computer that acts as an Internet gateway all of your computers can be mobile. Also, an ICS computer must always be on for any of the other network computers to reach the Internet. With a wireless access point, only the wireless access point must be powered up. Furthermore, the wireless network will not be disrupted if one or more network clients move out of range of one another. Individual computers will drop off the network as they move out of range of the wireless access point, but the others will continue to function normally. However, you ll have to buy a somewhat expensive wireless access point ($200 and up) that includes residential gateway or router functions, whereas ICS is included with Windows. If you decide you want an infrastructure mode network, configure each computer with a wireless network adapter and connect your Internet connection s DSL or cable modem connection to the wireless access point, as shown in the following illustration. Follow the manufacturer s instructions for configuring the access point for Internet and wireless connectivity.