Open Systems Interconnect Seven-Layer Model (OSI)

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        Mapping OSI's 7 layers to the internet:
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        7 Application e.g. HTTP, SMTP, SNMP, FTP, Telnet, SSH and Scp, NFS, RTSP 
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        6 Presentation e.g. XDR, ASN.1, SMB, AFP 
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        5 Session e.g. TLS, SSH, ISO 8327 / CCITT X.225, RPC, NetBIOS, ASP 
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        4 Transport e.g. TCP, UDP, RTP, SCTP, SPX, ATP 
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        3 Network e.g. IP, ICMP, IGMP, X.25, CLNP, ARP, RARP, BGP, OSPF, RIP, IPX, DDP 
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        2 Data Link e.g. Ethernet, Token ring, PPP, HDLC, Frame relay, ISDN, ATM, 802.11 WiFi, 
        FDDI 
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        1 Physical e.g. electricity, radio, laser 
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