Explain What are the standard Port numbers?

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SMTP - 25,
POP3 - 110,
IMAP4 - 143,
RPC - 135,
LDAP - 389,
SSL - 443,
HTTP - 80,
RDP - 3389,
DNS - 53,
DHCP - 67,68,
FTP-21,
GC-3268,
Secure LDAP - 636,
Kerberos - 88,
NNTP - 119,
TFTP - 69,
SNMP - 161.
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