What is a TCP/IP?


TCP/IP, Transmission Control Protocol/Internet Protocol, is a suite of communications protocols used to interconnect network devices on the Internet. TCP/IP implements layers of protocol stacks, and each layer provides a well-defined network services to the upper layer protocol. TCP and IP are the two protocols used by TCP/IP, as well as the (higher) application, (lower) data link and (lower) physical layer protocols.

Layer Protocols
5. Application DNS, FTP, HTTP, IMAP, POP3, SMTP, SSH, Telnet, SSL, ...
4. Transport TCP, UDP, ...
3. Network IP (IPv4, IPv6), ICMP, ARP, ...
2. Data Link 802.3 (Ethernet), 802.11 (Wi-Fi), PPP, ...
1. Physical Ethernet (NIC), Wireless (NIC), Cat 5/RJ-45, ...

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