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TCP - Transmission Control Protocol. A connection-oriented protocol used by most Internet applications to provide a reliable, full-duplex, byte stream for a user process.
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UDP - User Datagram Protocol. A connectionless protocol for user processes. Also not reliable.
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ICMP - Internet Control Message Protocol. Handles error and control information between gateways and hosts.
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IP - Internet Protocol. Provides the packet delivery service for the upper layers.
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ARP - Address Resolution Protocol. Maps an Internet address into a hardware address.
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RARP - Reverse Address Resolution Protocol.
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