Some of the useful ports are:

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                                  Some of the useful ports are:


Port Name

            Port Number

ftp

21/tcp  

Ssh

22/tcp

telnet

23/tcp

Stmp

25/tcp

htpp

80/tcp

Kerberos

88/tcp

Pop3

110/tcp

Imap

143/tcp

https

443/tcp

Ftps-data

989/tcp

Ftps

990/tcp

Telnets

992/tcp

Imaps

993/tcp

Pop3s

995/tcp

Ldap

389/tcp

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