By Debra Littlejohn Shinder
If deploying and dealing with ISA Server 2004 is only one of 100 obligations you have got as a approach Administrator, the way to Cheat at Configuring ISA Server 2004 is the proper publication for you. it is a concise, actual, company confirmed procedure for the winning deployment of ISA Server. Written by way of ISA Server guru and Microsoft most useful expert Dr. Tom Shinder, this publication displays the collective adventure of hundreds of thousands of winning ISA Server deployments and is sure to prevent numerous hours of frustration. insurance contains: fitting and Configuring the ISA Firewall software program, growing and utilizing ISA 2004 Firewall entry coverage, Publishing community prone with ISA 2004 Firewalls, developing distant entry and Site-to Site-VPNs with ISA Firewalls, ISA 2004 Stateful Inspection and alertness Layer Filtering, Accelerating net functionality with ISA 2004 Caching features, and utilizing ISA Server 2004's tracking, Logging, and Reporting instruments.
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Additional info for How to Cheat at Configuring ISA Server 2004
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.