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level: Common Ports

Questions and Answers List

level questions: Common Ports

QuestionAnswer
20-21File Transfer Protocol (FTP) TCP
22Secure Shell (SSH) TCP and UDP
23Telnet (TCP)
25Simple Mail Transfer Protocol (SMTP) TCP
50-51IPSec (TCP and UDP)
53Domain Name System (DNS) TCP and UDP
67-68Dynamic Host Configuration Protocol (DHCP) UDP
69Trivial File Transfer Protocol (TFTP) UDP
80HyperText Transfer Protocol (HTTP) TCP
110Post Office Protocol (POP3) TCP
119Network News Transport Protocol (NNTP) TCP
123Network Time Protocol (NTP) UDP
135-139NetBIOS/NetBT (TCP and UDP)
143Internet Message Access Protocol (IMAP4) TCP and UDP
161-162Simple Network Management Protocol (SNMP) TCP and UDP
389Lightweight Directory Access Protocol (LDAP) TCP and UDP
443HTTP with Secure Sockets Layer (SSL) TCP and UDP
989-990FTP over SSL/TLS (implicit mode) TCP
3389Remote Desktop Protocol (RDP) TCP and UDP