| Chapter 3. Network Architecture | ||
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| Chapter 3. Network Architecture | ||
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Table of Contents
We now have an understanding of TCP/IP and should have an understanding of client server technology. Let 's now consider how networks actually fit together?
In this chapter we will look at technology and terms such as switches, routers and hubs, Internet, Intranet and LAN 's and WAN's.
Two fundamental concepts in networking are the difference between the logical and the physical network. In covering these two concepts, we'll use an example as follows:
We have a hub or a switch and five workstations and a server connected. Physically, each one of these machines can see one another. In other words they are on the same physical network. If you were to draw that in terms of a wire, they are all plugged into the same physical PC wire.
Because of the structure of Internet Protocol (IP) and because of the fact that we can have different networks, we could take one set of machines on network A, 192.168.0.x and another set of machines of network B, 172.16.4.x.
That means that the two sets of machines are connected physically.
When machines are connected to the same networking backbone (wire), yet are on separate networks, these networks are termed Logical networks. For example you could have 5 machines with the address range on 192.168.0.x and 5 other machines on the address range 172.16.10.x. Although they are connected to the same backbone, they are on separate Logical Networks.
This physical network layout is that they are all connected. The logical network layout is that they are separated because they are on separate IP networks.
In fact workstations, on the 192.168.0 network will be unable to talk in any way to workstations that are on the 172.16.4 network.
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| Client / Server implemented with RPC |  |
How do we connect the machines Physically |