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What are Computer Networks?

Nodes vs links: devices or their connections.

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Types of networks: peer to peer or client server

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Protocols: tcp/IP, HTTP, SMTP, etc

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Tcp vs udp

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Lan vs wan

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Private vs public up

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Data transmission

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Hubs, switches and routers

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Ports: software-based channels that allow multiple services to exist on one computer.  These ports are also often reserved for specific protocols, such as HTTP, HTTPS, SSH and DNS.

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DNS

Domain names

VPN client vs server

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