ICMP - "Text Messaging" between devices, GRE - Encapsulates traffic inside of IP. Ex: VPN, IPSec - Provides encryption and security for traffic in OSI Layer 3, AH - Authenticates data in IPSec, ESP - Encrypts data in IPSec, TCP - Reliabiably transfers data, connection-oriented. Used for things like establishing connection to websites., UDP - Unreliable when transferring data, connectionless. Used for things like receiving YouTube video data,

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