Network+

Скачать в pdf «Network+»


Windows NT Architecture


Windows NT sports a fairly complex architecture that’s hidden behind a nice graphical front end. This powerful operating system is available in two packages:


■    Windows NT Server


■    Windows NT Workstation


The two share the same basic underlying architecture, but there are several key differences. Table 5.4 details these differences.


TABLE 5.4 Windows NT 4 Server vs. Windows NT 4 Workstation


Feature


Windows NT Server


Windows NT Workstation


Maximum number of processors supported


4 (a maximum of 32 with additional software components)


2


Maximum number of connections


Unlimited


10 inbound,


unlimited


outbound


Support for Macintosh services?


Yes


No


Remote Access Service


A maximum of 256 sessions


1 session


RAID (Redundant Array of Inexpensive Disks) support?


Yes


No


Can it perform NT domain authentication?


Yes (if the server is a domain controller)


No

Application Support Subsystems


Windows NT is designed as a modular system. With this in mind, examine Figure 5.8. Components fall into either the user mode or the kernel mode. This simply indicates which entity uses those components.


FIGURE 5.8 Windows NT architecture

I/O Manager Cache Manager File System Device Driver Network Driver




EXECUTIVE



Object


Process


Virtual


Local


Security


Manager


Manager


Memory


Manager


Procedure


Call


Facility


Reference


Monitor

Kernel


Hardware


The two components to note in this diagram are the Hardware Abstraction Layer (HAL) and the many subsystems that can run applications. These two components enable NT to run many types of applications on many hardware types.

Скачать в pdf «Network+»