Among the well-known ports used by tcp protocol, the port of Hypertext Transfer Protocol http is TCP port 80. According to the relevant information of the query, it shows that the common ports used by SNMP protocol are UDP ports 16 1 and 162. At the same time, it should be noted that FTP protocol of file transfer protocol uses TCP port 2 1, t FTP protocol of simple file transfer uses UDP port 69, and HTTP protocol of hypertext transfer protocol uses TCP port 80.