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⟩ What are the default ports used for SMTP,DNS,FTP,DHCP,SSH and squid?

Service: Port

SMTP: 25

SSH: 22

Squid: 3128

DNS: 53

FTP: 20 (data transfer) , 21 ( Connection established)

DHCP: 67/UDP(dhcp server) , 68/UDP(dhcp client)

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