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The first thing you must do, of course, is obtain a copy of the software You can purchase a copy for about $500 from a Cisco reseller or directly from Cisco's Web site (You'll be offered better deals from a reseller, however) If you are a reseller, you might be able to get an evaluation copy from a friendly competitor or channel partner The CiscoWorks CD-ROM takes up about 220MB of space, but much of this is left untouched by most users, as explained later in the "Supported Devices" section The second thing you must take care of is securing some additional documentation prior to attempting the installation Although the installation and configuration are not difficult, every installation is as different as the network it runs on, and supplementary information will undoubtedly prove essential to a successful evaluation or implementation If you purchase the CiscoWorks software, you will receive a few documents; but these are quite thin Also, there isn't much information on the CiscoWorks for Windows CD-ROM Go to Cisco's Web site for downloadable Adobe PDF files, at http://wwwciscocom/univercd/cc/td/ doc/product/rtrmgmt/cwfw/indexhtm

To get the imaginary part we calculate 1 1 z z f f = z + z + = z + z zz zz z z z+z z+z = zz zz zz = z 2 z + zz 2 z z zz

Although these networks worked fine as stand-alone networks, the proprietary nature of the hardware and software made it difficult to put it mildly to connect networks of multiple manufacturers To interconnect networks and improve networking as a whole, someone needed to create a guide, a model that described the functions of a network, so that people who made hardware and software could work together to make networks that worked together well The International Organization for Standardization, known as ISO, proposed the OSI seven-layer model The OSI seven-layer model provides precise terminology for discussing networks so let s see it! NOTE ISO may look like a misspelled acronym, but it s actually a word, derived from the Greek word isos, which means equal

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Consider an open region D in the complex plane and a function f : D If this function is continuous and if the partial derivatives f / x and f / y exist and are continuous, we say that f is continuously differentiable in D If f is k times continuously differentiable where k = 0,1, 2, (that is, k derivatives of f exist and are continuous) we say that f is C k If f is C 0 , this is a continuous function which is not differentiable Now, how do we determine if a function is analytic If f is a continuously differentiable function on some region D then it is analytic if it has no dependence on z That function is analytic in a domain D provided that df (314) =0 dz This condition must hold for all points in D Note that a function which is analytic is also called holomorphic Later we will see that we can form a local power series expansion of a holomorphic or analytic function Now let s go back to writing a function of a complex variable in terms of real and imaginary parts as in Eq (313) We want to think about how to compute the derivative d/dz in terms of derivatives with respect to the real variables x and y Let s go back to basics Remember that z = x + iy This tells us that z =1 x and z =i y (315)

Each layer in the OSI seven-layer model defines a challenge in computer networking, and the protocols that operate at that layer offer solutions to those challenges Protocols define rules, regulations, standards, and procedures so that hardware and software developers can make devices and applications that function properly The OSI model encourages modular design in networking, meaning that each protocol is designed to deal with a specific layer and to have as little to do with the operation of other layers as possible Each protocol needs to understand the protocols handling the layers directly above and below it, but it can, and should, be oblivious to the protocols handling the other layers The seven layers are