1 and TCP/IP (Transmission Control Protocol/Internet Protocol) are a series of protocols used for computer communication. It is the research result of a fund research project put forward by the Advanced Research Projects Agency of the US Department of Defense in 1970s. The purpose of this project is to find a way to transmit data using various media, including serial lines.

2. Because TCP/IP is highly interconnected, the US Department of Defense recognizes and promotes TCP/IP. Moreover, universities in the United States generally adopt BSDUnix with TCP/IP, and many manufacturers also install TCP/IP on BSDUnix system for free, which can be used on almost any type of machine for free. Therefore, TCP/IP has been widely recognized by people and shows strong competitiveness in the market. At present, almost all network operating systems provide support for TCP/IP, which has become the standard protocol of the Internet.

3.TCP/IP protocol family includes Internet Protocol (IP), Address Resolution Protocol (ARP), Internet Control Information Protocol (ICMP), User Datagram Protocol (UDP), Transmission Control Protocol (TCP), Routing Information Protocol (RIP), Telnet, Simple Mail Transfer Protocol (SMTP), Domain Name System (DNS) and other protocols.

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