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Internet Control Message Protocol (ICMP)
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Gateway-Gateway Protocol (GGP)
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Transmission Control Protocol (TCP)
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Exterior Gateway Protocol (EGP)
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PARC Universal Packet Protocol (PUP)
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User Datagram Protocol (UDP)
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Host Monitoring Protocol (HMP)
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Reliable Datagram Protocol (RDP)
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Reservation Protocol (RSVP) QoS
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General Routing Encapsulation (PPTP data over GRE)
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Encapsulation Security Payload (ESP) IPSec
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Authentication Header (AH) IPSec
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MIT Remote Virtual Disk (RVD)
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Internet Group Management Protocol (IGMP)
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OSPF Open Shortest Path First
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