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MCSA/MCSE: Windows Server 2003 Network Infrastructure by James Chellis

By James Chellis

Major adjustments were made to the MCSA and MCSE courses that allows you to offer a transparent occupation direction for IT pros helping home windows Server 2003. Sybex, winner of "Best examine publications" in CertCities.com 2002 Readers' selection Awards, bargains MCSA and MCSE applicants this thoroughly up-to-date version to aid arrange for middle examination 70-291, imposing, dealing with, and preserving a Microsoft home windows Server 2003 community Infrastructure. With extra in-depth assurance, real-world eventualities, and new perform questions that larger simulate these came across at the real examination, this advisor provides the educational and self belief you must be triumphant. The accompanying CD contains a sophisticated trying out engine with 1000s of pattern examination questions, digital flashcards for computer, Pocket computers, and Palm handhelds, in addition to the full publication in PDF.

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Specific protocols fulfill subtasks at specific layers of the OSI model. When these protocols are grouped together to complete a whole task, the assemblage of code is called a protocol stack. The stack is just a group of protocols, arranged in layers, that implements an entire communication process. Each layer of the OSI model has a different protocol associated with it. When more than one protocol is needed to complete a communication process, the protocols are grouped together in a stack. An example of a protocol stack is TCP/IP, which is widely used by Unix and the Internet—the TCP and IP protocols are implemented at different OSI layers.

The calculation is such: 3 bytes, or 24 bits, minus 3 reserved positions leaves 21 positions. There are therefore 221 or 2,097,152 possible Class C networks, each of which has 254 possible node addresses (remember, all 0s and all 1s are special addresses: 256 – 2 = 254). The lead bit pattern of 110 equates to decimal 192 and runs through 223. Remembering our handy easy-recognition method, this means that (although there are a total of 2,097,152 possible Class C networks) you can always spot a Class C address if the first byte is between 192 and 223.

The following sections will make the link clearer. We will introduce you to the specific protocols that are included with Windows Server 2003 and see how they apply to the various layers of the OSI model. Device Drivers and the OSI Model Every hardware device in a computer requires a software-based device driver to make it work. Some drivers—for instance, the driver for an integrated device electronics (IDE) hard disk or for the keyboard—are built into the operating system. Other devices require that drivers be installed separately when the device is attached or installed in the computer.

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