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Network layers

Address the following items:

What are network layers?
What is the OSI Model?
What is the TCP/IP stack?
Are there any other layering models/stacks/implementations?
Why is a layering approach taken in networking?
What is meant by a client/server network?
How does it differ from a peer-to-peer network? What is a server?
What is a service?
Is your router a server?
Is your computer a server?
What is Zeroconf?
What is a host?
What is a node?
What are network topologies?
What are bus networks? Ring networks? Star networks? Tree networks? Mesh networks?
Are there any other network topologies?
Is there a difference between physical and functional topologies?
Which topology is best?