Service, in my own words, is that a computer can't serve you. What do you want them for? The bus provides you with a ride service. Banks provide you with services such as deposit, withdrawal, loan and fund. Computers provide more services, but some services are invisible to you. For example, these big services, such as common printing services, * * * sharing services, communication services, internet services, chat services, etc., are all composed of many small services. Computer port number one * * * is: 65535X2= what? Anyway, it's more than130 thousand. How much do you want me to give you? Hehe, I'll give you the common ports and corresponding relationships!

Port 0: Reserved (usually used to analyze the operating system). 1: TCPMUX (TCP port service multiplexer), transmission control protocol port service multiplexer. 2. compressenet (compressenet management utility) and compressenet management utility. 3: Compression inet (compression process), compression process. 5: Remote job input and remote job login. 7: Echo, echo. 9: discard, discard. 1 1: active users, online users. 13: daytime, time. 17: same-day quotation, daily quotation. 18: Message sending protocol. 19: Character generator. 20: FTP (file transfer protocol [default data], file transfer protocol (default data port). 2 1: FTP (file transfer protocol [control]), file transfer protocol (control). 22: Remote Login Protocol. 23: Telnet, terminal emulation protocol. 24: Private mail system, reserved for personal mail system. 25: Simple Mail Transfer, Simple Mail Transfer Protocol. 27: NSW user system Fe, NSW user system field engineer. 29: msgicp.31:msgauthentication, msg authentication. 33: Display support protocol, display support protocol. 35: Dedicated printer server, reserved for personal printer service. 37: Time, time. 38: Routing Access Protocol. 39: Resource Location Protocol. 4 1: graph, graph. 42: WINS host name server, WINS host name service. 43: Who is who, "nickname" who is the service. 44: MPM marking protocol, MPM (Message Processing Module) marking protocol. 45: message processing module [recv], message processing module. 46:MPM[ default sending], message processing module (default sending port). 47: niftp 48: Digital audit daemon, digital audio background service. 49: Login Host Protocol (TACACS), TACACS login host protocol. 50: Remote Mail Inspection Protocol. 5 1: IMP logical address maintenance, IMP (Interface Information Processor) logical address maintenance. 52: xns time protocol, the time protocol of Xerox network service system. 53: domain name server, domain name server. XNS clearing house, the clearing house of Xerox network service system. 55: ISI graphic language, ISI graphic language. 56: XNS certification, Xerox network service system verification. 57: Any dedicated terminal access is reserved for personal terminal access.

59: Private file service, keep personal file service. 6 1: Nimar, Nimar. 62: ACA service, asynchronous communication adapter service. 63: WHOIS+.64: Communication Integrator (CI), communication interface. 65:TACACS- database service, TACACS database service. 66. Oracle Bone Inscriptions SQL * net.67. Bootstrap Protocol Server, Bootstrap Protocol Server. 68: Bootstrap Protocol Client, Bootstrap Protocol Client. 69: Small File Transfer, Small File Transfer Protocol. 70: gopher, information retrieval protocol. 7 1: Remote Job Service. 72: Remote operation service, remote operation service. 73: Remote operation service, remote operation service. 74: Remote operation service, remote operation service. 75: Any private dial-out service is reserved for personal dial-out service. 76: Distributed external object storage, distributed external object storage. 77: Any private rje service, reserved for personal remote operation input service. 78: vettcp, modified tcp. 79: FINGER, finger (query information such as online users of remote hosts). 80: World Wide Web HTTP, hypertext transfer protocol of the World Wide Web.

82: xfer utility, transport utility. 83: MIT ML equipment, modular intelligent terminal ML equipment. 84: public tracking facilities, public tracking equipment. 85: MIT ML equipment, modular intelligent terminal ML equipment. 86: microfocucobol, programming language. 87: Dedicated terminal link, reserved for personal terminal connection.

88:Kerberos, security authentication system. 89: SU/MIT Telnet Gateway, SU/MIT Terminal Simulation Gateway. 90: DNSIX security attribute token diagram, DNSIX security attribute label diagram. 9 1: MIT Dover winder, Dover spool. 92: Network Printing Protocol. 93: Device Control Protocol. 94: Tivoli object scheduler, Tivoli object scheduler.

95: SUPDUP .96: Dixie protocol specification, Dixie protocol specification. 97: Swift Remote Virtual File Protocol, Fast Remote Virtual File Protocol. 98: TAC News, TAC (Tokyo University Automatic Computer) news protocol. 99: Metasyntax Relay. 100:new acct[ unauthorized use].