Articles Archive for February 2016
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Services and protocols are distinct concepts although they are frequently confused. The distinction is so imprortant however that I emphasize it again in this article.
A service is a set of primitive operations that a layer provides to the layer above it .The service defines what operations the layer is prepared to perform on behalf of its users , but it says nothing at all about how these operations are implemented A service relates to an interface between two layer, with the lower layer being the service user.
A protocol in contrast is a set …
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Cosmology studies of the universe at large and its size, its shape and its evolution. Seeking to grasp the universe the mind of the cosmologist has to wander often at distances as great as 10 billion light years and over time as long as 10 billion years or longer.
Until the early part of this century astronomers thought the universe to be much smaller.
They thought that the in the universe the furthest stars at the edge of our galaxy were about 30,000 light years away and that there was nothing but …
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No matter what version of Linux you use,the piece of code common to all is the Linux kernel. Although the kernel can be modified to include support for the features you want. Every linux kernel can offer the following features.
1) Multiuser
Not only can you have many user accounts available on a linux system, you can also have multiple users logged in and working on the system at the same time. Users can have their own environment arranged the way they want :
their own home directory for storing files and their …